5 MPa, 384 K to an after cooler where the air is cooled at constant pressure to 298 K. Centrifugal B. Rotary displacement pump. chandarasekar. Single - Acting compressor. 250+ Gas Compressor Interview Questions and Answers, Question1: When working with pressurised cylinders, what conditions of associated storage have to be met? Question2: Is oxygen an inflammable gas? Question3: What is the main constituent of Natural Gas? Question4: What do the letters L. Each video will provide a recommendation for any parts needed. Compressors are intended to compress a substance in a gaseous state. Digital scroll compressor is a disengaging solenoid valve for bypassing discharge gas to the suction side of the compressor. question paper. Centrifugal pump. This is the first article in our series related to the Marine Engineering Practice, in every part we will try to cover 10-11 questions with answers. they are called. Free air is the air at (a) atmospheric conditions at any specific location (b) 20°C and 1 kg/cm2 and relative humidity of 36% (c) 0°C and standard atmospheric conditions (d) 15°C and 1 kg/cm2 (e) 25°C, 1 kg/cm2 and relative humidity of 50%. Some questions come up time and time again — usually about you, your experience and the job itself. Exam 2011, Questions Sample/practice Exam 2012, Questions Lecture Notes, Lecture All Fluid Flow Lectures Sample/practice Exam 2015, Questions and Answers - Additional Fluid Flow Questions Sample/practice Exam 2015, Questions And Answers - Additional Fluid Flow Questions Summary - Complete - Revision Sheet for Thermodynamics Part of the Course. 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The best type of reciprocating air compressor oil and appropriate oil viscosity to use for lubrication depends on factors such as the type of gas that is being compressed and the desired discharge pressure. Reciprocating Compressors Reciprocating compressors are the most widely used type for air compression. Refrigeration & Air-Conditioning Objective Questions With Answers - Set 01 Practice Test: Question Set - 01 1. Question: Reciprocating air compressor draws 6 kg of air per minute at 25°C. Axial compressors, known as superchargers, have also been used to boost the power of automotive reciprocating engines by compressing the intake air, though these are very rare. Compressor Applications RefineriesNatural Gas Compression & Transportation ServicesOil Exploration - Gas Reinjection, Gas lift, etc. 1 st stage piston relatively larger and 2 nd stage piston smaller in comparison, materials respectively aluminum and cast iron. Part-I: Objective type questions and answers 1. 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A standard ice point temperature corresponds to the. higher than c. The energy may be in the form of electrical energy, chemical energy, or any other type. Terms in this set (17) The evaporator of a chiller can be used to absorb heat from. me8493 thermal engineering – i short question & answers unit - 2. discharges it with a density of 0. the valve plate is manufactured of inferior materials. 5 m3/mt 18 m3/mt' 6 m3/mt. 2 (b) 1 : 2 (c) 1 : 5 (d) 1 : 10 (e) 1 : 1 Ans: a. Global Reciprocating Compressor Market by Manufacturers, Regions, Type and Application, Forecast to 2021 - A reciprocating compressor or piston compressor is a positive-displacement compressor that uses pistons driven by a crankshaft to deliver gases at high pressure. You have reached 0 of 0 points, ( 0) Not categorized 0% Question 1 of 17. Reciprocating Compressors. Rotary screw compressors can be run at lower temperatures for 24 hours per day, 365 days a year. 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Small quantity of air at high pressure C. Describe the difference between a reciprocating compressor and a rotary compressor. A refrigeration compressor were short cycling on the low pressure cut out switch the possible cause be a] system is overcharged with refrigerant b] suction valves were leaking slightly c] the system was low on refrigerant. Exam 2011, Questions Sample/practice Exam 2012, Questions Lecture Notes, Lecture All Fluid Flow Lectures Sample/practice Exam 2015, Questions and Answers - Additional Fluid Flow Questions Sample/practice Exam 2015, Questions And Answers - Additional Fluid Flow Questions Summary - Complete - Revision Sheet for Thermodynamics Part of the Course. In lap winding the number of brush locations is equal to number of poles and in wave winding it is always two. The air compressors can be. Consider a reciprocating compressor running at 150 rpm. Digital scroll compressor is a disengaging solenoid valve for bypassing discharge gas to the suction side of the compressor. This device uncovers part of the rotor and proportionately reduces capacity of the machine down to. Repair or replace. sullair 185 builds pressure,but doesn't have much volume. These conditions range from maximum discharge pressure and temperature to efficiency and cost. Large quantity of air at high pressure B. What will be the volume of air at 327 C if its volume at 27 C is 1. Rotary screw compressors can be run at lower temperatures for 24 hours per day, 365 days a year. they are called. Our HVACR practice exam consists of questions developed by HVAC Excellence, the largest provider of certifications (more than 200,000) in the HVACR industry. A refrigeration compressor were short cycling on the low pressure cut out switch the possible cause be a] system is overcharged with refrigerant b] suction valves were leaking slightly c] the system was low on refrigerant. It may also be a good idea to replace your vibration pads : 5. Freon group of refrigerants are (A) Inflammable (B) Toxic (C) Non-inflammable and toxic (. What is the equation for piston displacement? V=A*H: What is Cylinder Compression Ratio? Comparison of volume TDC and BDC: what ignites the fuel/air mixture? the spark plug: What is the stroke? Distance from Top Dead Center to Bottom Dead Center. This action is similar to an internal combustion engine in a car. Not only is refrigerant expensive, but refrigerant leaks will cause the compressor to eventually go out. QUESTION: Why should I buy a Champion Reciprocating Compressor? ANSWER: Champion has nearly a century of experience in designing and manufacturing air compressor systems. 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O pressure alarm and trip. A reading of -20°F or higher at 80 lb/in indicates that the dehydrator is not operating properly, and you should check the applicable technical manual to correct the problem. Thermal Engineering Questions paper with Answers. Two basic categories of chillers are the. Reciprocating, rotary, scroll, screw, centrifugal 15-3) Explain the difference between a positive displacement compressor and a non-positive displacement compressor. The cylinder valves control the flow of air through the cylinder; these valves act as check valves. You also find all interview questions at link at the end of this post. a refrigerator compressor is made up of two shells-- the upper one and the lower one. Excessive crank end play. In hermetically sealed compressor, the compressor and the motor are enclosed. 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Advantages and Disadvantages of Each Compressor Type * By taking the estimated full‐load bhp requirement of each compressor type at 100 psig discharge pressure at the compressor, a main‐drive motor with a typical efficiency of 92 percent and 0. Mechanical Engineering MCQ questions and answers for an engineering student to practice, GATE exam, interview, competitive examination and entrance exam. txt) or view presentation slides online. Rotary displacement pump. Only one answer is correct for each question. The compressor is simply reacting to discharge conditions, but the amount of work (and heat) developed is a function of the ratio of suction to discharge pressure so while the machine will almost magically rise to acheive any given discharge pressure it will only do that while the work is less than the maximum work the driver can do and the discharge temperatures are less. Centrifugal Compressor Operations and Maintenance Introduction Maximum efficiency, reliability, and longevity of compressors are of great concern to many industries. Posted on May 3, 2016 by Rick Welter. They are mainly used in high pressure applications since it can deliver air at about 30 - 40 bar. Similar Questions. Single - Acting compressor. Units and Symbols 2 III. QUESTION: Why should I buy a Champion Reciprocating Compressor? ANSWER: Champion has nearly a century of experience in designing and manufacturing air compressor systems. Take the Quiz and improve your overall Physics. Ingersoll Rand provides products, services and solutions that enhance our customers' energy efficiency, productivity and operations. 4 Common Questions About Air Compressors. You have reached 0 of 0 points, ( 0) Not categorized 0% Question 1 of 17. Reciprocating compressors play a major role in the chemical, petrochemical, gas, and general industry processes. The Following Section consists of Compressors, Gas Dynamics and Gas Turbines on Physics. Calculate the indicated power required for a free air delivery of 0. Both stages were having spring loaded suction and discharge non-return valves. The compressors are one of the most important parts of the refrigeration cycle. Various options are given as possible answers to the following questions. The piston connected to the crank by means of a connecting…. Practice 33 Industrial Air Compressor, Inc. 746 kW/bhp, the approximate efficiencies are obtained. 2) are inserted in the suction and discharge lines, they should be in the same plane as the compressor shaft i. Scribd is the world's largest social reading and publishing site. They are mainly used in high pressure applications since it can deliver air at about 30 – 40 bar. Rotary screw compressors can be run at lower temperatures for 24 hours per day, 365 days a. 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Refrigeration And Air Conditioning Air Conditioning Services Air Conditioning System Reciprocating Compressor Air Compressor Hvac Tools Electrical. What effect does this have on the system? A. We've gathered together the most common questions so you can get your preparation off to a flying start. Open Danny Frerich asked 4 months ago • Air Compresser Troubleshooting. However, this type of compressor still sees use on some land-based gas turbines and some turboprop aircraft. In a load/unload control scheme, the compressor remains continuously powered. Advanced Refrigeration: Unit 48 or unit 49: Refrigeration and Air Conditioning Technology (PCI - RH) Commercial Air Management Review. There is a central crankshaft that drives anywhere from two to six pistons inside cylinders. • Describe the various working parts of reciprocating and rotary compressors. Video content below is organized based on commonly asked questions and topics. Answer: C – While initial price may play a part in a compressor purchase, operators should always look at the reliability, quality and energy efficiency of a machine. 1) For diesel engine starting, where electric motor starting becomes costly and impractical. Reciprocating pump is a _____ a) Negative displacement pump b) Positive displacement pump c) Diaphragm pump. Remove the compressor cylinder head and inspect for foreign matter on top of the piston. com Commercial Drivers License Air Brakes Test - Practice Introduction This study guide contains one hundred ten commercial drivers license air brakes test questions and answers. Interview Questions with professional interview answer examples with advice on how to answer each question. 3 m3/min, when the compression process is as follows: (a) isentropic (b) isothermal (c) polytropic,. Source: Interview Questions & Answers: Best rgs. Each compression stage is carried out by a rotor in a matching diffuser. Thermal Engineering Questions paper with Answers. marked on a cylinder stand for? Question5: What are the two main constituents of L. Answer Explanation. D 2 Your Comments. You have reached 0 of 0 points, ( 0) Not categorized 0% Question 1 of 17. The practice application reveals the correct answer instantly right after you submitted the answer for each question and also provides the clause number that the question being taken. txt) or view presentation slides online. Find the answers to the questions related to troubleshooting of various machineries onboard like hydrophore system, and they come in Marine Engineering Practice. What is a positive displacement pump and how does it differ from a centrifugal pump? Positive displacement pump is […]. Similar Questions. A rotary screw compressor is designed so that the. Static Filled Coolant System. Best Refrigeration and Air Conditioning Objective type Questions and Answers. Both stages were having spring loaded suction and discharge non-return valves. Calor Gas. Hydraulics and Pneumatics Question paper (2020 Updated) This article is about( Hydraulics and Pneumatics Question paper) based on the hydraulic and pneumatic subject this contains model questions and answers from previous exams, This article is just to prepare for the exams. the valve plate is manufactured of inferior materials. Compressor Control 7. What is meant by single stage compressor? In …. It is a mechanical device which helps us to compressing the air where we required. Add a new gasket and reassemble the head. For a reciprocating compressor. Refrigeration And Air Conditioning Air Conditioning Services Air Conditioning System Reciprocating Compressor Air Compressor Hvac Tools Electrical. Name different types of reciprocating pumps?. Ideal Polytropic Index For Reciprocating Air Compressor? - posted in Industrial Professionals: Hi, Ive been looking at single stage reciprocating air compressor calculations and Im stumped by a problem. Anna University ME6404 Thermal Engineering Notes Syllabus 2 marks with answers Part A Question Bank with answers Key UNIT IV AIR COMPRESSOR Volumetric efficiency, Isothermal efficiency and Isentropic efficiency of reciprocating compressors, Multistage air compressor and inter cooling -work of multistage air compressor. They are often some of the most critical and expensive systems at a production facility, and deserve special attention. The compressors are one of the most important parts of the refrigeration cycle. Reciprocating Compressor. What system would you use? What type of system is this? - 3183478. Reciprocating Single Acting Compressors Reciprocating single acting compressors are generally of one-stage or two-stage design. Video content below is organized based on commonly asked questions and topics. To enable compression in two stages. Reciprocating air compressor is best suited for A. Components of Reciprocating Pump. Question: Reciprocating air compressor draws 6 kg of air per minute at 25°C. 4) for all scrolls. Pick up the wrong statement. Hydraulics and Pneumatics Question paper (2020 Updated) This article is about( Hydraulics and Pneumatics Question paper) based on the hydraulic and pneumatic subject this contains model questions and answers from previous exams, This article is just to prepare for the exams. The primary reason for jacket water cooling is to keep the cylinder wall and piston rings from getting too hot. Tank mounted pumps need no foundation but the tank is to be fixed. The increase in the specific internal energy is 33. This is the first article in our series related to the Marine Engineering Practice, in every part we will try to cover 10-11 questions with answers. Idle RPM and mixture, static RPM, propeller pitch change operation,and magneto check. 69 views 0 answers 0 votes. Reciprocating pumps are more suitable for low volumes of flow at high pressures. Not only is refrigerant expensive, but refrigerant leaks will cause the compressor to eventually go out. What could be the reasons if a synchronous motor fails to start? It is usually due to. 2 Rudy uses spring compressors to install coil springs in a. ANSWER: pressure energy, kinetic energy or both. Unlike reciprocating piston compressors, rotary screw rotors don't touch and have fewer moving parts, and because they are oil-sealed, they require. The flowchart explains the order of the questions. Compressors and pumps will transmit (5. Explain the construction and working of a centrifugal compressor. b)protect the compressor from low discharge pressure. The reciprocating compressor is probably the most versatile of all the types and is only out performed by rotary types when large volumes at low pressures are required. Related Posts. Even with a higher initial cost, compressors that are high quality tend to be reliable, leading to less down time and maintenance costs. Also, the com-pressor capacity is directly proportional to the speed. So my test is today and I'm not sure about a number of questions that I have on my practice test. 309 views 3 answers 0 votes. Reciprocating pump. A reciprocating compressor is a positive-displacement compressor that uses pistons driven by a crankshaft to deliver gases at high pressure. Find the work done by the compressor and air power. Unit Conversion 3 IV. Excessive crank end play. In the single-stage compressor, air is drawn in from the atmosphere and compressed to final pressure in a single stroke. The gpm per pump is 528 or 1584 gpm for all pumps Solution for HVAC Question #8. Terms in this set (17) The evaporator of a chiller can be used to absorb heat from. No explanation is available for this. reciprocating in the liner There is two valves first one inlet valve second one is Answer / u. Compressors and pumps will transmit (5. Unlike reciprocating piston compressors, rotary screw rotors don't touch and have fewer moving parts, and because they are oil-sealed, they require. With that wear comes a decrease in performance, oil carryover and more heat generation. a)protect the compressor from liquid flood back. Question Answer; In ft-lb per second, what is one horsepower? 550 ft-lb per second. They are two main types of air compressors. Anna University ME6404 Thermal Engineering Notes Syllabus 2 marks with answers Part A Question Bank with answers Key UNIT IV AIR COMPRESSOR Volumetric efficiency, Isothermal efficiency and Isentropic efficiency of reciprocating compressors, Multistage air compressor and inter cooling -work of multistage air compressor. Excessive crank end play. 4 Explain the types & working of a compressors ANSWER KEY 5 Explain the construction and working of a root blower NOTES 6 Drive an expression for the volumetric efficiency of reciprocating air compressors ANSWER KEY 7 Drive an expression for the work done by single stage single acting reciprocating air compressor ANSWER KEY 8. In order for us to provide you with an adequate response, please click on the appropriate form below and answer as many of the questions and only those. These objectives can only be achieved by understanding the characteristics, selection criteria, sealing arrangements, common problems, repair techniques as well as their preventive and predictive maintenance. Which of the following type does Screw compressor belongs to? a) Positive displacement compressor b) Dynamic compressors c) Both a & b d) None of the above 2. A standard ice point temperature corresponds to the. There is a central crankshaft that drives anywhere from two to six pistons inside cylinders. Welcome to Centrifugal Compressor Online Quiz-Part 1!!! Compressors are used to increase the pressure of a compressible fluid (gas or vapour). Our 300 question HVAC practice test provides: assessment of broad based HVACR knowledge. This type of compressor will not have any problems running a larger spare tank. The increase in the specific internal energy is 33. Show ALL calculations and units. Hopefully you will like this video. Keep firing questions at us, we live this stuff and can help you solve just about any problem that may come up, call us at (866) 413-8077. Centrifugal Compressors - Mechanical Engineering (MCQ) questions and answers. Unlike reciprocating piston compressors, rotary screw rotors don't touch and have fewer moving parts, and because they are oil-sealed, they require. Reciprocating compressors are positive displacement machines in which the compressing and displacing element is a piston having a reciprocating motion within a cylinder. Open Danny Frerich asked 4 months ago • Air Compresser Troubleshooting. Single – Acting compressor. water and a solution of water and polyethylene. Source: Interview Questions & Answers: Best rgs. Is This Answer. Trouble shooting questions are answered on another page, there links to other popular air compressor related pages to the right. Compressor Interview Questions and Answers-2018 {Part:-1} In this video we discussed most important Compressor Interview Questions and Answers-2018 which has been asked by different top company. 1 vs 2 vs 3 stage compressor. What checks should be made to determine the proper operation of a reciprocating engine installation? answer choices. reciprocating compressor drives; power factor correction; voltage regulation of transmission lines; What is a synchronous capacitor? An over excited synchronous motor is called synchronous capacitor, because, like a capacitor, it takes a leading current. Following Mechanical Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2020 and IES 2020 examinations : 11. Question 30. The flowchart explains the order of the questions. In a rotary screw compressor, oil should be changed about every 7000-8000 hours. A benefit of operation a compressor unloaded is. 4) for all scrolls. This is the first article in our series related to the Marine Engineering Practice, in every part we will try to cover 10-11 questions with answers. Name different types of reciprocating pumps?. they are called. Reciprocating pump. STUDY MATERIAL FOR THE CERTIFICATE OF FITNESS FOR: G-35 answers to each question. Ans: It was a in line reciprocating 2 stage compressor. 30 mol of air. Posted on May 3, 2016 by Rick Welter. 14-1 General With the exception of the fact that gases are compressible the theory of design for equipment to move gases and vapors is similar to that of pumps for liquids. Drive an expression for the volumetric efficiency of reciprocating air compressors. Freon group of refrigerants are (A) Inflammable (B) Toxic (C) Non-inflammable and toxic (. Question: Describe The Major Functions Of The Following Reciprocating Engine Components: Piston, Connecting Rod, Crankshaft, Cams And Camshaft, Valves, Intake And Exhaust Manifolds. operating the compressor at excessive speed C. Calor Gas. In order to achieve the required pressure ratio, several compression stages may be required, in one or more casings. Turbo compressors are preferred for high mass flow systems because of their simplicity and reliability compared with screw or reciprocating compressors. Go to Google Play Now » Pump Questions and Answers Covering the Construction, Application, Operation, Installation, Maintenance, and Troubles of Centrifugal, Reciprocating, Regenerative, Rotary, and. Otto, Diesel, Dual, Brayton cycles, Calculation of mean effective pressure, and air standard efficiency - Comparison of cycles. Share your thoughts after watching this video. The following are trademarks for one or more DEWALT power tools, accessories, anchors and concrete adhesives: The yellow and black color scheme; the "D"-shaped air intake grill; the array of pyramids on the handgrip; the kit box configuration; and the array of lozenge-shaped humps on the surface of the tool. Axial flow compressor. me8493 thermal engineering - i short question & answers unit - 2. 11MPa, 298K which it delivers at 1. Also find mechanical efficiency if shaft power is 14 kW. Read, highlight, and take notes, across web, tablet, and phone. Operating Range of Reciprocating Compressor 4 VI. The discussion on the this page on reciprocating compressors includes a description of process configuration for multistage units, as well as an explanation of the concepts of. Reciprocating. tutorial is mainly about reciprocating compressors. The first and most important choice you will make is whether to buy a rotary or a reciprocating compressor. b) engine attaches to the shock mounts at the engine's center of gravity. An oil slinger is used with reciprocating compressors that are lubricated by: B) Pressure lubrication. It compresses the air polytropically and delivers it at 105°C. What is a positive displacement pump and how does it differ from a centrifugal pump? Positive displacement pump is […]. In hermetically sealed compressor, the compressor and the motor are enclosed. A reciprocating compressor uses a piston-actuated unloading mechanism with spring-loaded pins to raise the suction valve plate from its seat, allowing the unit to be used at any pressure ratio. Each compression stage is carried out by a rotor in a matching diffuser. 0 Air Compressors. 1007 views 1 answers 0 votes. You may use a non-programmable scientific calculator and drawing/mathematical instruments. Show ALL calculations and units. (The fluid here is generally air since liquids are theoretically incompressible). Find the work done by the compressor and air power. You have reached 0 of 0 points, ( 0) Not categorized 0% Question 1 of 17. If you do not answer a question or if you mark more than one alternative your answer The most commonly used air compressor is the reciprocating air compressor. This type of compressor will not have any problems running a larger spare tank. 10 Questions Show answers. The piston connected to the crank by means of a connecting…. Ariel is the largest manufacturer of separable reciprocating gas compressors in the world, setting the standard in quality, reliability, and customer support. Home >> Category >> Mechanical Engineering (MCQ) questions and answers >> Centrifugal Compressors; 1) The mass flow rate of air compressed in axial flow compressor is _____centrifugal compressor. Find the work done by the compressor and air power. Refrigeration And Air Conditioning Air Conditioning Services Air Conditioning System Reciprocating Compressor Air Compressor Hvac Tools Electrical. Explain the construction and working of a root blower ME8493 Important 16 Mark Questions Thermal Engineering 1. However, this type of compressor still sees use on some land-based gas turbines and some turboprop aircraft. Both answers are correct. For airplanes with small reciprocating engines, does the mixture and throttle setting at the time of priming affect the quality of the priming or the engine start, or. Question: An Ideal Vapor-compression Refrigeration Cycle That Uses Refrigerant-134a As Its Working Fluid Maintains A Condenser At 800 KPa And The Evaporator At −12°C. Get Textbooks on Google Play. Axial flow. Welcome to Centrifugal Compressor Online Quiz-Part 1!!! Compressors are used to increase the pressure of a compressible fluid (gas or vapour). A standard ice point temperature corresponds to the. Tighten the bolts on the air compressor. on StudyBlue. Compressor types • Positive Displacement Machines (high pressure ratio, low mass flow rates) - Rotating • Screw compressors (Lysholm) • Scroll compressor • Roots blowers - Alternating (Reciprocating Compressor) • Turbocompressors (low pressure ratio, high mass flow rates) - Centrifugal compressor - Axial compressor - Mixed. Both stages were having spring loaded suction and discharge non-return valves. ANSWER : : 1. Each passage reads similar to a newspaper of journal article, and provides interesting information about some aspect of history, nature, mechanics, science, art, and more. Elgi Equipments Limited is an air compressor manufacturer. It is best known and most widely used compressors of the positive displacement type. The cylinder valves control the flow of air through the cylinder; these valves act as check valves. Ariel offers a variety of classroom training courses designed for a wide range of client operations, maintenance, and engineering personnel. Compressors, Gas Turbines and Jet Engines Interview Questions and Answers :-101. Drive an expression for the volumetric efficiency of reciprocating air compressors. 2 (b) 1 : 2 (c) 1 : 5 (d) 1 : 10 (e) 1 : 1 Ans: a. The rotary compressor is usually very small compared compared to the reciprocating compressor. 1 st stage piston relatively larger and 2 nd stage piston smaller in comparison, materials respectively aluminum and cast iron. 1 Answer to 1-16C You are trying to understand how a reciprocating air compressor (a piston-cylinder device) works. net 11 37 C The reading on the micrometer scale shown in figure "B" in the. Hydraulic Machines Questions and Answers - Reciprocating Pumps « Prev. The comparison is studied based on various parameters like maximum and minimum flow, Inlet and outlet pressure, efficiency, Compression ratio, discharge temperature, Flow range, materials of. 1007 views 1 answers 0 votes. We get questions from clients and customers all the time. 18) The sensing line for the low pressure cutout switch to a refrigeration system is located. reduced energy costs and reduced compression ratios. Reciprocating air compressor is best suited for. ME8493 Important 16 Mark Questions Thermal Engineering 1. Ariel's online learning offerings give you the ability to learn about the fundamentals of gas compression and Ariel compressor parts and components. Reciprocating Single Acting Compressors Reciprocating single acting compressors are generally of one-stage or two-stage design. Reciprocating compressors are characterized with higher pressures and reduced mass flow rate. Answered Fred Mensah asked 6 months ago • Air Compresser Troubleshooting. A tool, such. The design of a high-efficiency reciprocating compressor requires an understanding of the interactions between different phenomena occurring inside the compressor. Name the basic components required in hydraulic system. Ariel offers a variety of classroom training courses designed for a wide range of client operations, maintenance, and engineering personnel. The MiG-15, made famous during the Korean War, was equipped with a different kind of compressor than that found on modern jet fighters and airliners. Compressors can be of a lubricated, non-lubricated or oil-less design. However, this type of compressor still sees use on some land-based gas turbines and some turboprop aircraft. State your assumptions. Two basic categories of chillers are the. 2340L5-V 5hp 60 gal Two-Stage Compressor (230/1) Designed for Heavy Shop and Industrial Use Delivering 175 psi maximum operating pressure, this 5 horsepower air compressor is designed to meet the demanding needs of automotive service and body shops, fleet maintenance, machine shops, production and manufacturing lines, woodworking shops, dry. Explain the construction and working of a centrifugal compressor. 2 (b) 1 : 2 (c) 1 : 5 (d) 1 : 10 (e) 1 : 1 Ans: a. In terms of crankcase oils, the recommended ISO viscosity grade is 68, 100, 150 or 200, which can vary based on the ambient temperature. Unlike reciprocating piston compressors, rotary screw rotors don't touch and have fewer moving parts, and because they are oil-sealed, they require. Reciprocating compressors are. b) A reciprocating air compressor taken in 2m3/min air at 0. The cylinder is connected to suction and delivery tube each of which provide with a non return valve called suction valve and delivery valve. Gas transmission pipelines, petrochemical plants, refineries and many other industries all. Learn hvac unit 47 with free interactive flashcards. Air Compressor - Air Compressor objective questions and answers A. Freon group of refrigerants are (A) Inflammable (B) Toxic (C) Non-inflammable and toxic (. Test Your knowledge on Compressors - Online Quiz. d)-start the compressor after a drop in the evaporator pressure. 10 Questions Show answers. MODULE-VI --- RECIPROCATING COMPRESSOR APPLIED THERMODYNAMICS 2014 pressure ratios. Rotary displacement pump. Reciprocating air compressor is best suited for A. It is best known and most widely used compressors of the positive displacement type. Gas transmission pipelines, petrochemical plants, refineries and many other industries all. The rotary compressor is usually very small compared compared to the reciprocating compressor. For the purposes of this paper, a reciprocating compressor is defined as: A piece of equipment that increases the pressure of a process gas by positive displacement, employing linear movement of the driveshaft. O pressure alarm and trip. The compressor capacity of a reciprocating compressor is directly proportional to __ a) Speed b) Pressure c) Volume d) All 3. The energy may be in the form of electrical energy, chemical energy, or any other type. The single-stage. higher than c. Compressor Questions. Recent Class Questions. they are called. What is the equation for piston displacement? V=A*H: What is Cylinder Compression Ratio? Comparison of volume TDC and BDC: what ignites the fuel/air mixture? the spark plug: What is the stroke? Distance from Top Dead Center to Bottom Dead Center. 30 mol of air. marked on a cylinder stand for? Question5: What are the two main constituents of L. Time has elapsed. A reading of -20°F or higher at 80 lb/in indicates that the dehydrator is not operating properly, and you should check the applicable technical manual to correct the problem. It depends on the service and operating conditions. Reciprocating/piston air compressor troubleshooting Through this website I have helped hundreds of people from all over the world with their compressor repair and troubleshooting questions. The maximum compression ratio in an actual single stage axial flow comperssor is of the order of (a) 1 : 1. Dry Hydrogen gas. RECIPROCATING COMPRESSOR TABLE OF CONTENT I. Maybe it's the condenser fan, wire problems or a crankcase heater. "CoC Oral Exam Questions & Answers" It was a in line reciprocating 2 stage compressor. Asking yourself the right questions early on like "what will the compressor be used for," "where they reduce the volume of trapped air and deliver it compressed, at the proper pressure level. A refrigerant should have (a) Tow specific heat of liquid (b) high boiling point (c) high latent heat of vaporisation (d) higher critical temperature (e) low specific volume of vapour. Ariel's online learning offerings give you the ability to learn about the fundamentals of gas compression and Ariel compressor parts and components. A reciprocating compressor or piston compressor is a positive-displacement compressor that uses pistons driven by a crankshaft to deliver gases at high pressure. pdf), Text File (. Determine the heat transfer in (i) the compressor (ii) the cooler. So basically air compressors convert a low pressure low temperature air into a high pressure high temperature air. In a rotary screw compressor, oil should be changed about every 7000-8000 hours. Terms in this set (17) The evaporator of a chiller can be used to absorb heat from. In all the household refrigerators, deep freezers, window air conditioners, split air conditioners, most of the packaged air conditioners, the hermetically sealed reciprocating compressor is used. multiple choice questions in basic mechanical engineering on topic of Turbo machines for interview, entrance test and competitive examination freely available to download for pdf export. You may use a non-programmable scientific calculator and drawing/mathematical instruments. / Test Your knowledge on Compressors - Online Quiz. Rotary displacement pump. 287 kJ/kg°K and n = 1. Read, highlight, and take notes, across web, tablet, and phone. Air compressors are sometimes called air pumps. 1 st stage piston relatively larger and 2 nd stage piston smaller in comparison, materials respectively aluminum and cast iron. compressors chapter 23 - function of compressor different types of compressors. Air Compressor | Interview Question and Answers Air Compressor | Interview , viva , Oral Question and Answers 1. The answer to this question depends on whether or not you have a continuous duty air compressor or not. b)protect the compressor from low discharge pressure. The MiG-15, made famous during the Korean War, was equipped with a different kind of compressor than that found on modern jet fighters and airliners. The compressor is simply reacting to discharge conditions, but the amount of work (and heat) developed is a function of the ratio of suction to discharge pressure so while the machine will almost magically rise to acheive any given discharge pressure it will only do that while the work is less than the maximum work the driver can do and the discharge temperatures are less. 5 Common Air Conditioning Questions & Answers. Small quantity of air at low pressure D. Latest Refrigeration and Air Conditioning Questions and Answers 1. It may also be a good idea to replace your vibration pads : 5. A refrigerant should have (a) Tow specific heat of liquid (b) high boiling point (c) high latent heat of vaporisation (d) higher critical temperature (e) low specific volume of vapour. Take up the quiz below and see how good you are as a refrigerant machine operator. Most sources Ive found say that when dealing with the polytropic index for flow calculations for compressors, an ideal process is isothermal for the least amount of required work (n = 1). If you do not answer a question or if you mark more than one alternative your answer The most commonly used air compressor is the reciprocating air compressor. An air compressor may be controlled by throttle control (b) clearance control. 5 MPa, 384 K to an after cooler where the air is cooled at constant pressure to 298 K. Operating Range of Reciprocating Compressor 4 VI. Common to most reciprocating engines is a linkage known as a crank-slider mechan-ism. • Common compressor types include the scroll, reciprocating and the rotary • Positive displacement compressors require that the compressed gas be moved to the condenser. The discussion on the this page on reciprocating compressors includes a description of process configuration for multistage units, as well as an explanation of the concepts of. Calculate the exhaust temperature and the power output. 1) to their connecting pipe work. Centrifugal Compressors - Mechanical Engineering (MCQ) questions and answers. It is best known and most widely used compressors of the positive displacement type. Thermal Engineering Questions paper with Answers. Solution for HVAC Question #6. Reciprocating pump. OBJECTIVE QUESTIONS (REFRIGERATION) 1. Maybe it's the condenser fan, wire problems or a crankcase heater. me8493 thermal engineering – i short question & answers unit - 2. By signing up you agree to receive emails from PORTER-CABLE with news, special offers, promotions and other information. They are often some of the most critical and expensive systems at a production facility, and deserve special attention. A compressor is a device that takes a substance, usually gas, air or water, and compresses it into a smaller space than it would otherwise occupy, then releases it at a high rate. reduced energy costs and reduced compression ratios. However, this type of compressor still sees use on some land-based gas turbines and some turboprop aircraft. 2340L5-V 5hp 60 gal Two-Stage Compressor (230/1) Designed for Heavy Shop and Industrial Use Delivering 175 psi maximum operating pressure, this 5 horsepower air compressor is designed to meet the demanding needs of automotive service and body shops, fleet maintenance, machine shops, production and manufacturing lines, woodworking shops, dry. 2007 Agra Sales Conference ,. What are the safety devices in air compressors on ships ? Bursting discs are fitted on the cooler shells (At water side). However, when the demand for compressed air is satisfied or reduced, instead of disconnecting power to the compressor, a device known as a slide valve is activated. abrasion by dust and dirt Tricky Question Answer will be anyone of them But You Have to Choose the Most Appropriate 4. Latest Refrigeration and Air Conditioning Questions and Answers 1. Reciprocating Compressor. You also find all interview questions at link at the end of this post. Otto, Diesel, Dual, Brayton cycles, Calculation of mean effective pressure, and air standard efficiency - Comparison of cycles. 0 of 17 questions answered correctly. A dew point temperature reading of -40°F or lower at 80 lb/in 2 is normal for LP (type II and type III) dehydrators. Compressor Combination Packages Industrial Duty air compressors for maintenance trucks, service fleets or technicians that need to save space and weight. Also find mechanical efficiency if shaft power is 14 kW. c)start and stop the compressor upon system demand. A hermetically sealed compressor cannot be worked on as the internal components of the compressor are permanently sealed while the semi-hermetic reciprocating compressor is a compressor that can be rebuilt and put back into service. a refrigerator compressor is made up of two shells-- the upper one and the lower one. reciprocating in the liner There is two valves first one inlet valve second one is Answer / u. 14-1 General With the exception of the fact that gases are compressible the theory of design for equipment to move gases and vapors is similar to that of pumps for liquids. Compressor Questions. What is meant by double acting compressor? In double acting reciprocating compressor, the suction compression and delivery of air take place on both side of the piston. Time has elapsed. For the purposes of this paper, a reciprocating compressor is defined as: A piece of equipment that increases the pressure of a process gas by positive displacement, employing linear movement of the driveshaft. In these reading comprehension worksheets, students are asked questions about information they have read about a specific topic. Reciprocating Compressor. Keep firing questions at us, we live this stuff and can help you solve just about any problem that may come up, call us at (866) 413-8077. Indicate On An Appropriate Sketch The Different Forces That Act On The Piston, And The Direction Of These Forces, During The Engine's Expansion Stroke With The Piston, Connecting. ANSWER : : 1. Question 1. We get questions from clients and customers all the time. Units and Symbols 2 III. George Medhurst of England designed the first motorized air compressor in 1799 and used it in mining. The flowchart explains the order of the questions. Gas compression process in reciprocating compressor can be expressed such in figure 5. Next » This set of Hydraulic Machines Multiple Choice Questions & Answers (MCQs) focuses on "Reciprocating Pumps". two-stage reciprocating compressors offer you more choices of compressor sizes and compressor features to suit your needs. Compressor Interview Questions and Answers-2018 {Part:-1} In this video we discussed most important Compressor Interview Questions and Answers-2018 which has been asked by different top company. Small quantity of air at high pressure C. Drive an expression for the volumetric efficiency of reciprocating air compressors. Stay safe and healthy. We've gathered together the most common questions so you can get your preparation off to a flying start. No all compressor cylinders, either single acting or double acting, have water jackets. Both stages were having spring loaded suction and discharge non-return valves. It depends on the service and operating conditions. Dry Hydrogen gas. abrasion by dust and dirt Tricky Question Answer will be anyone of them But You Have to Choose the Most Appropriate 4. If the flow of air through the compressor is perpendicular to its axis,then it is A. • State specific conditions under which a compressor is expected to operate. Difference between Centrifugal and Reciprocating Compressor This article lists a few of the differences between a centrifugal and reciprocating compressor. In lap winding the number of brush locations is equal to number of poles and in wave winding it is always two. Gas transmission pipelines, petrochemical plants, refineries and many other industries all. Question 30. Latest Refrigeration and Air Conditioning Questions and Answers 1. Source: Interview Questions & Answers: Best rgs. These conditions range from maximum discharge pressure and temperature to efficiency and cost. Mechanical Engineering MCQ questions and answers for an engineering student to practice, GATE exam, interview, competitive examination and entrance exam. You can send your comments directly at [email protected] It may also be a good idea to replace your vibration pads : 5. Next » This set of Hydraulic Machines Multiple Choice Questions & Answers (MCQs) focuses on "Reciprocating Pumps". The type of refrigerant that your air conditioner needs may also cause you problems down the road. The other types are covered briefly. Rotary screw air compressors last longer than reciprocating air compressors. Centrifugal pump. What are the safety devices in air compressors on ships ? Bursting discs are fitted on the cooler shells (At water side). Round off final answers to TWO decimal places. By signing up you agree to receive emails from PORTER-CABLE with news, special offers, promotions and other information. However, this type of compressor still sees use on some land-based gas turbines and some turboprop aircraft. Open Danny Frerich asked 4 months ago • Air Compresser Troubleshooting. 1) to their connecting pipe work. A standard ice point temperature corresponds to the. Which of the following is used for testing the leaks in the entire refrigeration circuit before it can be charged with refrigerant: Dry Nitrogen gas. Here are some basic questions you'll want to answer before you get into the finer details of buying an air compressor. Question 30. Air compressors are sometimes called air pumps. The type of refrigerant that your air conditioner needs may also cause you problems down the road. In all the household refrigerators, deep freezers, window air conditioners, split air conditioners, most of the packaged air conditioners, the hermetically sealed reciprocating compressor is used. Ingersoll Rand provides products, services and solutions that enhance our customers' energy efficiency, productivity and operations. 5 MPa, 384 K to an after cooler where the air is cooled at constant pressure to 298 K. Content : Syllabus, Question Banks, Books, Lecture Notes, Important Part A 2 Marks Questions and Important Part B 16 Mark Questions, Previous Years Question Papers Collections. Explain the construction and working of a centrifugal compressor. They are mainly used in high pressure applications since it can deliver air at about 30 – 40 bar. Compressed air has numerous uses throughout a facility including the operation of equipment and portable tools. Mechanical Engineering MCQ questions and answers for an engineering student to practice, GATE exam, interview, competitive examination and entrance exam. Tighten the bolts on the air compressor. Positive displacement compressors can be further classified based on the type of mechanism used for compression. Asking yourself the right questions early on like "what will the compressor be used for," "where they reduce the volume of trapped air and deliver it compressed, at the proper pressure level. Keep firing questions at us, we live this stuff and can help you solve just about any problem that may come up, call us at (866) 413-8077. Study Chapter 1 - Reciprocating Engines - Oral Questions flashcards from Chamour Labbe's class online, or in Brainscape's iPhone or Android app. Consider a reciprocating compressor running at 150 rpm. 2340L5-V 5hp 60 gal Two-Stage Compressor (230/1) Designed for Heavy Shop and Industrial Use Delivering 175 psi maximum operating pressure, this 5 horsepower air compressor is designed to meet the demanding needs of automotive service and body shops, fleet maintenance, machine shops, production and manufacturing lines, woodworking shops, dry. What is meant by single stage compressor? In …. Rent and save from the world's largest eBookstore. Gas compression process in reciprocating compressor can be expressed such in figure 5. Question: An Ideal Vapor-compression Refrigeration Cycle That Uses Refrigerant-134a As Its Working Fluid Maintains A Condenser At 800 KPa And The Evaporator At −12°C. No explanation is available for this question! 3) Which of the following is NOT a type of positive displacement pumps? a. 746 kW/bhp, the approximate efficiencies are obtained. Moisture drain valve (unloader) are fitted at each cooler side. Only one answer is correct for each question. This motor can be electric or internal combustion. Both stages were having spring loaded suction and discharge non-return valves. An air compressor is a mechanical device which utilizes energy to compress air. A reciprocating compressor is a device that compresses air by a back-and-forth straight-line motion, like a piston in a cylinder. Reciprocating compressors play a major role in the chemical, petrochemical, gas, and general industry processes. Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07 Practice Test: Question Set - 07 1. Rent and save from the world's largest eBookstore. The practice application reveals the correct answer instantly right after you submitted the answer for each question and also provides the clause number that the question being taken. However, this type of compressor still sees use on some land-based gas turbines and some turboprop aircraft. Positive displacement compressors can be further classified based on the type of mechanism used for compression. About China CNG Station Compressor Natural Gas Compressor FOB price, Payment, OEM information, Reciprocating Compressor from china on topchinasupplier. This motor can be electric or internal combustion. Even with a higher initial cost, compressors that are high quality tend to be reliable, leading to less down time and maintenance costs. Centrifugal compressors are used where larger quantity and lower pressure is required. 1 st stage piston relatively larger and 2 nd stage piston smaller in comparison, materials respectively aluminum and cast iron. Compressor Questions. The compressor has a similar design to an internal combustion engine; it even looks similar. None of the above. Maximum delivery pressure is a rotary air compressor is of the order of (a) 6 kg/cm2 (b) 10 kg/cm2 (c. a refrigerator compressor is made up of two shells-- the upper one and the lower one. 5 °C temperature difference across the evaporator. Compressors, Gas Turbines and Jet Engines Interview Questions and Answers :-101. b)before the. Answer / swathy nabeel. Recent Class Questions. water and a solution of water and polyethylene. You have reached 0 of 0 points, ( 0) Not categorized 0% Question 1 of 17. (The fluid here is generally air since liquids are theoretically incompressible). Dry Hydrogen gas. Reciprocating pumps are more suitable for low volumes of flow at high pressures. Explain the construction and working of a root blower ME8493 Important 16 Mark Questions Thermal Engineering 1. Questions (9) Publications. Difference between Centrifugal and Reciprocating Compressor This article lists a few of the differences between a centrifugal and reciprocating compressor. Are fully closed. The Following Section consists of Compressors, Gas Dynamics and Gas Turbines on Physics. Welcome to Centrifugal Compressor Online Quiz-Part 1!!! Compressors are used to increase the pressure of a compressible fluid (gas or vapour). Refrigeration And Air Conditioning Air Conditioning Services Air Conditioning System Reciprocating Compressor Air Compressor Hvac Tools Electrical. Small quantity of air at high pressure C. 2 (b) 1 : 2 (c) 1 : 5 (d) 1 : 10 (e) 1 : 1 Ans: a.
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