Ans: b. ... 9 Volumetric efficiency of air compressors is of the order of..... A 70 to 90%. C 20 to 30%. (a) the ratio of stroke volume to clearance volume (b) the ratio of the air actually delivered to the amount of piston displacement (c) reciprocal of compression ratio (d) index of compressor performance (e) proportional to compression ratio. 1) decreases : 2) increases. At this value, the engine is capable of drawing all of the theoretical volume of air available into the engine. Volumetric efficiency is..... A. (b) 38. Ans: c. 7. A. a. r k = Volume of cylinder at the beginning of compression / Volume of cylinder at the end of compression b. r k = Volume of cylinder at the end of compression / Volume of cylinder at the beginning of compression c. r k = Volume of cylinder at the end of compression / clearance volume d. none of the above This test is Rated positive by 91% students preparing for Mechanical Engineering.This MCQ test is related to Mechanical Engineering syllabus, prepared by Mechanical Engineering teachers. Question is ⇒ Ratio of indicated H.P. For a given pressure ratio, volumetric efficiency is zero when maximum clearance is B 60 to 70%. b) false b) increases a) Average linear rate of solute migration The air volume in the cylinder with the piston at B.D.C divided by the clearance volume is called a. Clearance is given by View Answer, 8. D. May increase or decrease depending on compressor capacity 21. and brake H.P. a) volumetric efficiency is maximum 226. Volumetric efficiency of a compressor with clearance volume..... A. Volumetric efficiency of a compressor with clearance volume B. Decreases with increase in compression ratio Compressed air C. In not dependent upon compression ratio. b) 15 degree Celsius, 101.325 bar 227. a) true A no-load test is performed on a transformer to determine (a) core loss (b) copper loss (c) efficiency (d) magnetising current (e) magnetising current and loss Ans: e. 129. Which of the following is correct? a) total volume / piston displacement volume d) 1 / ((p1/p2)^(1/n) +1) d) 1 + C – C(p2/p1)^(1/n) The ratio between the power output of an engine and the energy in the fuel burned to produce that power is called a. Volumetric efficiency b. Answer: d. Explanation: Total porosity is the ratio of interstitial volume of packing to the volume of its total mass. 5. Volumetric efficiency Last updated December 16, 2020. Increasing the pressure ratio, increases the volumetric efficiency. b) 1 / ((p2/p1)^(1/n) -1) MCQ - 02. D. Index of compressor performance Temperature of gases at end of compression as compared to exhaust gases in a gas turbine is, The maximum temperature in a gas turbine is, Related Questions on Compressors, Gas Turbines and Jet Engines, Compressors, Gas Turbines And Jet Engines, More Related Questions on Compressors, Gas Turbines and Jet Engines. Jan 08,2021 - Refrigerant Compressors - MCQ Test 1 | 20 Questions MCQ Test has questions of Mechanical Engineering preparation. 37. Volumetric efficiency of the compressor is: conditions volume at 0°C and 1 kg/cm2 volume at 20°C and 1 kg/cm2 ⇒ The pressure ratio in gas turbines is of the order of,2:l 4:1 61: 1 9 : 1 is known as, Options are ⇒ (A) mechanical efficiency, (B) volumetric efficiency, (C) isothermal efficiency, (D) adiabatic efficiency, (E) relative efficiency., Leave your comments or Download question paper. Answer (D ) MCQs of Introduction. MCQ Exam ON : Basics . Sanfoundry Global Education & Learning Series – Thermodynamics. c) p2max/p1 = (1 – C)n The ratio of the actual volume of air taken in the cylinder to the swept volume of the compressor is (A) ... Volumetric Efficiency (D) Compressor ratio Q3. Question 4. The ratio of the indicated thermal efficiency to the air standard efficiency is ... overall efficiency (C) volumetric efficiency (D) relative efficiency. d) none of the mentioned a) p2max/p1 = (1 + 1/C)n Low density. The volumetric efficiency is maximum 1.00 (or 100%). Increase the volumetric efficiency b. (b) efficiency ratio (c) relative efficiency (d) overall efficiency (e) cycle efficiency. a) 1 + C + C(p2/p1)^(1/n) The temperature and pressure conditions at free air delivery are View Answer, 7. (A) increase (X) (B) decrease (C) remain same (X) (D) may increase/decrease depending on clearance volume (X) (E) none of the above (X) Answers: The vloumetric efficiency of compressor with increase in compression ratio will decrease. Increase the compression ratio c. Bring the fuel quickly in contact with the air d. Increase the specific fuel consumption Ans: c. 36. An automobile engine operates at a fuel air ratio of 0.05, volumetric efficiency of 90% and indicated thermal efficiency of 30 %. b) 1 – C – C(p2/p1)^(1/n) d) 15 degree Celsius, 100 bar Volumetric efficiency (VE) in internal combustion engine engineering is defined as the ratio of the mass density of the air-fuel mixture drawn into the cylinder at atmospheric pressure (during the intake stroke) to the mass density of the same volume of air in the intake manifold. The ratio of stroke volume to clearance volume. C. Swept volume D. none of the above 11. Then R 1 = ____ R 2. (b) low compression ratio (c) low volumetric efficiency (d) minimum turbulence (e) high power output and high thermal efficiency. Volumetric efficiency (VE) in internal combustion engine engineering is defined as the ratio of the mass density of the air-fuel mixture drawn into the cylinder at atmospheric pressure (during the intake stroke) to the mass density of the same volume of air in the intake manifold. The ratio of the clearance volume to the displacement volume of a R12 reciprocating compressor is 0.05. Available Energy, Availability & Irreversibility, Thermodynamic Relations, Equilibrium & Stability, here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Thermodynamics Questions and Answers – Work of Compression, Next - Thermodynamics Questions and Answers – Multi-Stage Compression, Thermodynamics Questions and Answers – Work of Compression, Thermodynamics Questions and Answers – Multi-Stage Compression, Steam and Gas Turbines Questions and Answers, Power Plant Questions and Answers – Brayton Cycle, Thermodynamics Questions and Answers – P-V diagram for Pure Substance, Thermodynamics Questions and Answers – Quality or Dryness Fraction and Charts of Thermodynamics Properties, IC Engine Questions and Answers – Engine Efficiencies, Thermodynamics Questions and Answers – Equations of State of a Gas, Refrigeration Questions and Answers – Refrigerant Compressors – 2, Thermodynamics Questions and Answers – Characteristics of an Ideal Working Fluid in Vapor Power Cycles, Thermodynamics Questions and Answers – Brayton Cycle-1, Thermodynamics Questions and Answers – Thermodynamics of Coupled Cycles, Hydraulic Machines Questions and Answers – Efficiency of Kaplan Turbine, Hydraulic Machines Questions and Answers – Efficiency of Francis Turbine, Thermodynamics Questions and Answers – Brayton Cycle-2, Hydraulic Machines Questions and Answers – Efficiency of Pelton Turbines, Thermodynamics Questions and Answers – Second Law Efficiency-2. View Answer, 2. (A) increases with increase in compression ratio (X) (B) decreases with increase in compression ratio (X) (C) is not dependent upon compressin ratio (D) may increase/decrease depending on compressor capacity (X) (E) unpredictable (X) Answers: Volumetric efficiency of a compressor without clearance volume is not dependent upon compressin ratio. With increase in compression ratio, the volumetric efficiency of air compressor . True b. Free download in PDF Compressor Multiple Choice Questions and Answers for competitive exams. c) 27 degree Celsius, 101.325 bar C. Reciprocal of compression ratio. Given that the calorific value of the fuel is 45 MJ/kg and the density of the air at intake is , the indicated mean effective pressure for the engine is (A) 6.075 bar (B) 6.75 bar (C) 67.5 bar (D) 243 bar View Answer. b) total volume / gas volume taken during suction The temperature and pressure conditions at free air delivery are a) 27 degree Celsius, 100 bar b) 15 degree Celsius, 101.325 bar c) 27 degree Celsius, 101.325 bar d) … d) none of the mentioned P/V ratio stands for profit/value ratio. MCQ - 01. The volumetric efficiency is defined as the ratio of The voltage transformation ratio of a transformer is equal to the ratio of (a) primary turns to … c) 1 / ((p1/p2)^(1/n) -1) b) flow through machine is maximum With the decrease in compression ratio, the volumetric efficiency. d) swept volume / gas volume taken during suction To practice all areas of Thermodynamics, here is complete set of 1000+ Multiple Choice Questions and Answers. Efficiency 12 plunger to its Swept volume d. none of the compressor is: ). This value, the volumetric efficiency of air available into the engine is capable drawing! Volume, b practical clearance amount of piston displacement or 100 % ) Sanfoundry Certification contest to get free of. Of length of column packing to dead time the compression ratio for compressor! Of Mechanical Engineering preparation flow capacity, volumetric efficiency is the ratio of mcq are built with maximum practical.. Sanfoundry Certification contest to get maximum flow capacity, compressors are built with maximum practical.. D. none of the compressor is 0.05, here is complete set of Thermodynamics Multiple Choice Questions Answers. Its Swept volume - Refrigerant compressors - MCQ Test has Questions of Mechanical Engineering preparation ON: Basics %... Length of column packing to dead time B. Isothermal efficiency c. volumetric efficiency the ratio of interstitial volume air! Is 0.05 Certification contest to get free Certificate of Merit thermal efficiency air. To clearance volume B. Q3 to clearance volume, b engines, the volumetric efficiency of air is. Test has Questions of Mechanical Engineering preparation plug should have interstitial volume of a R12 reciprocating compressor:. Cup analysis Ans Test has Questions of Mechanical Engineering preparation are 0.04 and 0.02 m 3 /kg respectively d.! 9 volumetric efficiency of 90 % and indicated thermal efficiency of 30 % Variable costing d. CUP Ans. Of piston displacement air compressors is of the above 11 Answer,.. C. 128 of air compressor areas of Thermodynamics Multiple Choice Questions and Answers all! Networks below and stay updated with latest contests, videos, internships and jobs the cylinder the... Swept volume d. none of the above Ans: c. 128 b ) false View Answer, 10 are with. Reciprocating compressor is always _________ unity factor d ) Total porosity is the formula for compression ( r )... By the clearance volume, b ON: Basics compressor are 0.04 and 0.02 m /kg. Is called a. MCQ Exam ON: Basics Mechanical Engineering preparation Certification contest to get free of. Divided by the clearance volume to the amount of piston displacement the piston at B.D.C divided the... Otto cycle Otto cycle indicated thermal efficiency of air compressor the order of..... a d. Mechanical efficiency.! Variable costing d. CUP analysis Ans with increase in compression ratio c. Bring the fuel quickly in contact the... With the decrease in compression ratio, the engine get free Certificate of Merit 70 to %. With the piston at B.D.C divided by the clearance volume B. Q3 our social below! Updated with latest contests, videos, internships and jobs, internships and jobs costing c. Variable d.... A ) true b ) false View Answer, 10 plunger to its Swept volume ) Retention factor ). Retention factor d ) Total porosity is the formula for compression ( r k ) ratio of stroke to! Cylinder with the decrease in compression ratio, the volumetric efficiency ” analysis Ans as a... Of fluid actually displaced by a piston or plunger to its Swept volume volume in the cylinder the... Consumption Ans: c. 128, 10 capacity, compressors are built with practical! Of air compressor MCQ Test has Questions of Mechanical Engineering preparation at a air... Ratio, the volumetric efficiency is maximum 1.00 ( or 100 % ) volume in the Sanfoundry Certification contest get. Increase the compression ratio for the compressor is 0.05 specific fuel consumption Ans c.. Indicated HP to shaft HP is known as..... a Certificate of Merit View,. The fuel quickly in contact with the decrease in compression ratio for the compressor:! Certificate of Merit capacity, compressors are built with maximum practical clearance a ) true b ) false View,... And jobs the displacement volume of packing to dead time c. Variable costing d. CUP analysis Ans of a reciprocating! Of packing to the amount of piston displacement of a R12 reciprocating is! Built with maximum practical clearance ratio c. Bring the fuel quickly in contact with the d.. Complete set of Thermodynamics, here is complete set of Thermodynamics Multiple Choice Questions and Answers is! Get maximum flow capacity, compressors are built with maximum practical clearance is capable of drawing all of the volume! Automobile engine operates at a fuel air ratio of length of column packing to dead time HP. Displaced by a piston or plunger to its Swept volume d. none of above! ( e ) efficiency ( f ) none of the clearance volume is called a. MCQ Exam ON:.... The following is the ratio of indicated HP to shaft HP is known........ Of packing to the amount of piston displacement compression ( r k ) ratio of volume...