3. Reciprocating compressors can only be fully optimized for maximum throughput if either the cylinder capacity utilization or the power utilization, or both, is 100%. A self-contained lubricating system for bearings, gears, and cylinder walls, including a reservoir or sump for the lubricating oil, and a pump, or other means of delivering oil to the various parts. In a wide range of equipment, air compressors are the primary need for all of them. In multistage compressor, the isothermal compression is achieved by (a) employing intercooler (b) by constantly cooling the cylinder (c) by running compressor at very slow speed (d) by insulating the cylinder (e) none of the above. Although compressor capacity increases with increasing suction pressure, gas well deliverability benefits from lower suction pressures. Rotary Screw Compression Enerflex offers 20 hp to 3,000 hp field-proven custom and standard rotary screw compressor packages built to any technical specification, for moving large volumes at lower suction and discharge pressures. The P-V diagram is a plot of the pressure of the gas versus the volume of the gas trapped in the compression chamber. Compressors, Gas Turbines and Jet Engines MCQ Practice Test - Set 01 The most common type of air compressor is the screw air compressor … Contact us: info@mechanicaltutorial.com, Production Technology and Manufacturing Process. Two stage Reciprocating Air Compressor with Intercooler: First of all, the fresh air is sucked from the atmosphere in the low pressure (L.P.) cylinder during its suction stroke at intake pressure P 1 and temperature T 1. In this mechanical engineering coures we study of machine design objective. To conduct performance test on a two stage reciprocating compressor and to determine the volumetric efficiency. Compressor required reservoir for compressed air - Hydraulics & Pneumatics Home >> Category >> Mechanical Engineering (MCQ) questions and answers >> Hydraulics & Pneumatics Q. Prevents the excessive cycling of a compressor. 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. The air, after compression in the L.P. Take the Quiz and improve your overall Physics C. To enable compression in two stages . Centrifugal and reciprocating compressors and their drives require a variety of auxiliary equipment to support their operation. Rotary Compressors. A short summary of this paper. The Following Section consists of Compressors, Gas Dynamics and Gas Turbines on Physics. Pneumatic Systems – Concepts and Components - Mechanical Engineering (MCQ) questions and answers. Pick up the wrong statement. For a Reciprocating air compressor, generally you would change the oil approximately every 3 months. It reduces the cost of compressor. Dampens pulsations from the discharge line of a reciprocating compressor, resulting in an essentially steady flow of air in the system. To help operators of reciprocating compressors gain greater Like a reservoir of anything else, it’s a reserve (well, sure; hence the name) and a buffer. Answer is: axial flow type. This Compressor quiz also unveils you about the Selection, Types, Design and Performance Calculations, Components and Safety aspects of compressors. The rotary compressor is adaptable to direct drive by induction motors or multi-cylinder gasoline or diesel engines. www.gtu-mcq.com is an online portal for the preparation of the MCQ test of Degree and Diploma Engineering Students of the Gujarat Technological University Exam. In a reciprocating air compressor the air temp at the end of compression is too high. Ans: b 2. Latest Compressors, Gas Turbines and Jet Engines Questions and Answers Pdf 1. The intercooling in multistage compressors is done..... A. Turbine Manager, MCQ bases aptitude questions. Ans: a Standard air is the air at (a) atmospheric conditions at any specific … The cylinder head is an aluminum casting which contains the required air and water 46. While many business owners sometimes find it difficult to decide which type of air compressor would work best for them? Explanation: Generally, rotary screw air compressors deliver more air compared to reciprocating compressors of the same size. please do not enter any spam link in the comment box 41. MECHANICAL ENGINEERING- COMPRESSORS, GAS TURBINES AND JET ENGINES 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%. Today we study of mcqs on axial flow compressor. Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. Reciprocating air compressor is best suited for...... 45. Apparatus Required : The test unit consisting of an air reservoir on air intake tank with an orifice and a U tube manometer , the compressor having pressure gauge , energy meter and stop watch . For a more accurate time frame, call in with a model number to find the recommended schedule for your compressor. We work closely with Howden Thomassen Compressors B.V. in serving the low-speed traditionally the API 618 reciprocating compressor market. Can't read the image? of the motor or engine required to drive the compressor You can fill it up gradually but steadily, then draw it down as needed. In this mechanical engineering coures we study of machine design or objective. Chemical Engineering Site already published articles on Reciprocating Compressor Trips and Safety Aspects and Centrifugal Compressor Surge – Choke which was well received by the users. 44. Reciprocating air compressor is best suited for..... A. READ PAPER. The overall isothermal efficiency of the compressor is defined as the ratio of (A) Work required to compress the air isothermally to the actual work required to compress the air for the same pressure ratio (B) Isothermal power to the shaft power or B.P. Large quantity of air at high pressure B. Reciprocating compressors require air reservoir tanks to reduce air pulses created in the compression process as well as using that reservoir to handle larger demands of air. The units are compact, relatively inexpensive, and require a minimum of operating attention and maintenance. www.gtu-mcq.com is an online portal for the preparation of the MCQ test of Degree and Diploma Engineering Students of the Gujarat Technological University Exam. PDF. 6. can be used with or without any air reservoir or storage tank; because of the uniform nature of the gas output. Premium PDF Package. Hello friends my name is Roshan Namdeo Waje and founder of mechstudy.here I shere the imforfation about mechanical engineering. For example, a 5,000-hp reciprocating compressor using a simple bypass to reduce compressor capacity from 100% to 90% will need to recycle gas that is already compressed, effec-tively wasting more than $326,000/yr in energy costs, assuming a local utility rate of $0.10/kWh. ConversionConversion A) centrifugal type B) reciprocating type C) lobe type D) axial flow type. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) Download PDF Package. If the flow of air through the compressor is perpendicular to its axis,then it is a....... 43. The equipment for these compressors is described as below:-1. • Rotary screw compressors do not require an air reservoir, but; • for certain applications, a reservoir is a good addition to a rotary screw compressor applica- In Figure 1, P S Explanation: ... it requires cooling water for its operation. Compressor bearings receive lubricating oil from lube oil console. In an axial flow compressor,the ratio of pressure in the rotor blades to the pressure rise in the compressor in one stage is known as......... 44. Lube Oil Console. PDF. Specification : Compressor To cool the air during compression. Reciprocating air compressor is best … compressor is a two cylinder reciprocating compressor with a rated displacement of 27 cubic feet per minute at 1250 RPM. The positive displacement compressor is....... You can send your comments directly at info@mechanicaltutorial.com. To cool the air at delivery . Which type of compressor requires a reservoir for compressed air and why? D. To minimise the work of compression Which type of compressor requires a reservoir for compressed air and why? The displacement of a screw compressor is a function of rotor diameter, length and profile and the compressor speed, which is a direct result of the driver speed and any gear ratios. Reciprocating Compressors consist of a piston acting within a cylinder to physically compress the gas contained within that cylinder. Following mechanical engineering mcq or  objective questions is help you in ssc je 2020, ESE 2020, Gate 2020, IES 2020, psu 2020 examinations. EmoticonEmoticon, In this mechanical engineering coures we study of power plant mcq or objective. Gas turbines use following type of air compressor. Small quantity of air at high pressure C. Small quantity of air at low … ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) A reciprocating compressor is a positive displacement machine in that a volume of gas is drawn into a compressor cylinder’s compression chamber where it is trapped, compressed and pushed out. 7. PDF. Mustakim Al Taki. Mcq on reciprocating pump (objective questions) In this mechanical engineering coures we study of machine design or objective. Reciprocating Compressors. Download Full PDF Package. 113) Gas turbines use following type of air compressor. In a rotary screw compressor, oil should be changed about every 7000-8000 hours. Require an air reservoir or storage tank to compensate for the pulsating nature of compressed air. Following mechanical engineering mcq or objective questions is help you in ssc je 2020, ESE 2020, Gate 2020, IES 2020, psu 2020 examinations. B. Ans: c. 47. 31 Full PDFs related to this paper. 42. The compressor consists of a water cooled cylinder head and valve body assembly and an air cooled integral crankcase and cylinder block. On some compressors a separate force-fed lubricator is installed to supply oil to the compressor cylinders. They occupy a fraction of the space and weight of a reciprocating machine of equivalent capacity. 2. Download PDF. Download Free PDF. Today we study of  mcq on rolling  contact bearing (objecti... Mcq on reciprocating pump objective questions on hydraulic machine, Mcq on reciprocating pump (objective questions). Rotary screw compressors do not create the same type of air pulses and can deliver large amounts of air when required without the need of a reservoir tank. This depends on the type of compressor you purchase. Serves as an air reservoir to take care of sudden or unusually heavy demands for air that’s in excess of the compressor’s designed capacity. Enter the code above here : Today we study of. PDF. This paper. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. a. rotary compressor to avoid pulsating effect b. reciprocating compressor to avoid pulsating effect c. both rotary and reciprocating compressors to avoid pulsating effect d. none of the above View Answer / Hide Answer 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%. • Reciprocating air compressors require the use of an air tank • The larger the air tank, the less work the reciprocating compressor has to do. Compressors, Gas Dynamics and Gas Turbines Online Test - Multiple Choice Questions and Answers,online quiz,online bits,interview questions pdf free download Free PDF. Compressors are the primary need for all of them motors or multi-cylinder gasoline or diesel Engines gradually but,! 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You purchase Following Section consists of compressors, Production Technology and Manufacturing.. End of compression is too high or without any air reservoir or storage tank to for... A fraction of the Gujarat Technological University Exam Systems – Concepts and -. Api 618 reciprocating compressor and to determine the volumetric efficiency owners sometimes find it difficult to which. Compressors are the primary need for all of them a reservoir for compressed air and?... Compressors of the motor or engine required to drive the compressor consists of compressors drive. Work best for them determine the volumetric efficiency Standard air is the screw air compressors deliver more air to! Separate force-fed lubricator is installed to supply oil to the compressor rotary compressors capacity... Type of compressor requires a reservoir for compressed air here: Ca read. In a reciprocating air compressor, resulting in an essentially steady flow of air compressor 7... The flow of air compressor would work best for them lobe type D ) reciprocating compressor requires reservoir to mcq flow compressor difficult! Is perpendicular to its axis, then draw it down as needed from lower suction.! Pulsations from the discharge line of a reciprocating air compressor is best … require an cooled! Roshan Namdeo Waje and founder of mechstudy.here I shere the imforfation about mechanical Engineering coures we study of design...