A positive displacement compressor is the system which compresses the air by the displacement of a mechanical linkage reducing the volume (since the reduction in volume due to a piston in thermodynamics is considered as positive displacement of the piston). Radial flow c. Mixed flow d. All have same specific speed. Following mechanical engineering mcq or objective questions is help you in ssc je 2020, ESE 2020, Gate 2020, IES 2020, psu 2020 examinations. 1.4.2 Performance metri form a range of hand tools having wide use in construction work. Surge/Stonewall of centrifugal compressor. Q5.Which compressors are suitable for large volume flow rates of above 1200 m3/min a) Centrifugal compressors b) Axial flow compressors c) Both a and b d) None of the above Positive displacement blowers and compressors deliver an almost constant level of pressure increase at all engine speeds (RPM). 30% c. 55% d. 60% e. 70% Answer: E. In an electrostatic precipitator the: a. discharge electrode is negatively charged b. collector electrode is negatively charged c. d... Rotary pumps: a. Isothermal compression through most efficient cannot be realized in practice because that necessitates, placing the cylinder in a stream of water. Positive displacement air compressor types are, The cross-section of a Bourdon tube is generally. D. Vane blower compressor. A positive displacement compressor in the process system; A dynamic compressor in the process system; THE CONCEPT OF FLUID HEAD. Non-positive displacement type includes centrifugal axial flow compressor. A.Reciprocating air compressor B.Vane blower C.Centrifugal blower D.Axial flow compressors Related posts: Which of the following is not a positive displacement compressor? Gradually the volume of each chamber decreases and the air is compressed internally. 10% b. This test is Rated positive by 93% students preparing for Mechanical Engineering.This MCQ test is related to Mechanical Engineering syllabus, prepared by Mechanical Engineering teachers. 13. In positive displacement compression, atmospheric air is drawn into one or more of its compression chambers, which are then closed from the inlet. The positive displacement compressor is..... A. mcq no - 5 The positive displacement pumps work on the principle of (A) the liquid is discharged due to the positive displacement Which of the following is not the advantages of multi-stage compression? Positive displacement compressors are usually of the reciprocating piston type, in which the gas is drawn in during the suction stroke of the piston, compressed by decreasing the volume of the gas by moving the piston in the opposite direction, and, lastly, discharged when the… A positive displacement air compressor works by drawing air into a compression chamber through an intake and mechanically reducing the volume of the chamber through motion until a set pressure is reached. 3. You can find other Compressors - 1 extra questions, As the volume of each chamber decreases, the air is compressed internally until the pressure reaches the designed build-in pressure ratio. D. Index of compressor performance View Answer . Isothermal compression requires minimum power input. Are low-pressure pumps b. Pneumatic breakers, picks, spades, rammers, vibrators, riveters etc. Air motor finds application in following except. Chaper VI -Compressor. Positive displacement type of compressor b. Uniform torque and better mechanical balancing. Mcq on reciprocating pump (objective questions) Home >> Category >> Mechanical Engineering (MCQ) questions and answers >> Centrifugal Pumps; 1) Which of the following centrifugal pumps has higher specific speed than the others? Navigation. Positive Displacement Compressors (Reciprocating and Rotary) . Engineering :: Turbo machines @ : Home > Mechanical Engineering > Turbo machines. Four cycle engine lubrication is usually: Potential Environmental Impact of Liquids, Potential Environmental Impact of Operating Facilities. The ratio of the air actually delivered to the amount of piston displacement. students definitely take this Compressors - 1 exercise for a better result in the exam. An AC electric welding process c. Normally an automatic process d. ... A check valve is a valve that: a. allows flow in one direction only b. allows flow in two directions c. allows flow at regular inter... Solenoid Valves are used in: 1. E.Both A and D Your Comments. a) Positive displacement type of compressor b) Steady flow compressor c) Both a and b d) None of the above. Compressed air is used in a wide variety of applications where the use of electric motors or S.l. A dynamic displacement compressor compresses the air by imparting the kinetic energy of the rotating parts to the air. 42. Today we study of objective or mcq reciprocating compressor. Today, we’ll take a look at different types of compressors that use positive displacement compression. Use of large coolant water makes compressor bulky and decreases the engine speed. Positive Displacement Compressors Positive displacement compressors draw in and capture a volume of air in a chamber. Example of non-positive displacement compressor: E. Both A and D View Answer . In case of positive displacement compressors increase the pressure of air/gas by reducing the volume. positive displacement (PD)• Rotary Sliding Vane Liquid Piston Helical Lobe Screw Reciprocating Mechanical Piston . Low pressure, medium pressure, and high pressure c.... A clamp-on ammeter measures current flow by using: a. Shunting current through a milli-ammeter b. Positive Displacement Compressors Positive displacement compressors have mechanical parts which draw in gas in steps of discrete volume from the inlet of the compressor. Holiday schedule. This action reduces the volume of the gas, increases the pressure of the gas and discharges the gas from the outlet of the compressor. Rotary compressors are positive and non positive displacement compressors. engines is not permissible and where high safety is required to bemet as in mining applications. Positive Displacement and Non-Positive Displacement Compressor ~ Briefly In Hindi Learn Mech. Online (MCQ) Practical. Which type of rotary compressor is used in oil fired furnaces? The positive displacement compressor working principle is very simple. C. Axial flow compressor. In positive displacement compression, the air is drawn into one or more compression chambers, which are then closed from the inlet. Comparison Between Disc Brake & Drum Brake, TOM, Mechanical Engineering, GATE, Syllabus - Mechanical Engineering : ME, GATE, What is Cams & Followers, TOM, Mechanical Engineering, GATE, Mechanical Properties of Engineering Materials. a. Books. The first one includes, for example, reciprocating (piston) compressors, orbital (scroll) compressors and different types of rotary compressors (screw, tooth, vane). ... Displacement Refrigerant Compressors and Condensing Units”. The compressed air is then discharged through a valve at the rated pressure, providing a flow of air. Air conditioning ducts are classified as: A clamp-on ammeter measures current flow by using: Fluidized bed boilers can successfully burn coal with ash contents as high as. The solved questions answers in this Compressors - 1 quiz give you a good mix of easy questions and tough questions. There are two main types of superchargers defined according to the method of gas transfer: positive displacement and dynamic compressors. Q10.All of the following are positive displacement compressors EXCEPT a) Screw compressor b) Axial flow compressor c) Roots blower d) Vane blower. Dynamic Radial / Centrifugal Mixed . B. Centrifugal compressor. This contains 10 Multiple Choice Questions for Mechanical Engineering Compressors - 1 (mcq) to study with solutions a complete question bank. Put another way, a positive displacement compressor is one which operates by drawing in a discrete volume of gas from its inlet then forcing that gas to exit via the compressor's outlet. Roots blower compressor. All of the following are positive displacement compressors EXCEPT : Which of the following is a positive displacement rotory compressor? Your name: Your Email: Your Comments: You can send your comments directly at info@mechanicaltutorial.com. Compressor (centrifugal & reciprocating) principles of operation. Then, … A) Improves volumetric efficiency for the given pressure ratio B) Reduced work done per kg of air C) Gives more uniform torque D) All of these accommodate valves in the cylinder head of the compressor. Most suitable choice is (b). EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. Jan 09,2021 - Compressors - 1 | 10 Questions MCQ Test has questions of Mechanical Engineering preparation. Hair dryer is either battery or electrically powered. b) Centrifugal compressor c) Axial flow compressor d) All of the above. Continuous flow . Dynamic compressors divided into Radial and Axial. reduce the work input per kg of air delivered. Then it reduces the volume of the compression chamber. There is reduction in work required per stroke and therefore the total driving power is also reduced. C. Reciprocal of compression ratio. Cancel Unsubscribe. As the volume of each chamber decreases through the displacement of one or more moving parts, pressure increases. A positive displacement compressor, compress the air by forcing air into a compression chamber and by decreasing its volume. The increase in the pressure of the gas is due, at least in part, to the compressor pumping it at a mass flow rate which cannot pass through the outlet at the lower pressure and density of the inlet. The reciprocating compressors are.suitable for low discharge (maximum limit 50 m3/min) at high delivery pressures (as high as 1000 bar). a. Axial flow b. Maintaining constant temperature requires large quantity of coolant water. 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