(b) efficiency ratio (c) relative efficiency (d) overall efficiency (e) cycle efficiency. ... 9 Volumetric efficiency of air compressors is of the order of..... A 70 to 90%. The clearance volumetric efficiency is equal to 227. 37. Question 4. b) total volume / clearance volume Compressor efficiency B. Isothermal efficiency C. Volumetric efficiency D. Mechanical efficiency 12. The ratio of the air actually delivered to the amount of piston displacement. b) increases Free download in PDF Compressor Multiple Choice Questions and Answers for competitive exams. D. May increase or decrease depending on compressor capacity c) p2max/p1 = (1 – C)n a) total volume / swept volume a) Average linear rate of solute migration a) 27 degree Celsius, 100 bar Volumetric efficiency is The ratio of the air actually delivered to the amount of piston displacement (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. (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. 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. Specific volume at inlet and outlet of compressor are 0.04 and 0.02 m 3 /kg respectively. 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. 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. a) p2max/p1 = (1 + 1/C)n Increase the compression ratio c. Bring the fuel quickly in contact with the air d. Increase the specific fuel consumption Ans: c. 36. c) both of the mentioned View Answer, 5. b) Volumetric phase ratio c) Retention factor d) Total porosity. b) 1 – C – C(p2/p1)^(1/n) Jonathanalleyne's interactive graph and data of "A Graph of Volumetric Efficiency versus Pressure Ratio for A Compressor" is a scatter chart, showing Col1 vs Col1 - fit; with Compressor Pressure Ratio in the x-axis and Compressor Volumetric Efficiency/% in the y-axis.. Volumetric efficiency of the compressor is: a. View Answer, 2. (e) efficiency (f) none of the above Ans: c. 128. 226. Increasing the pressure ratio, increases the volumetric efficiency. and brake H.P. False Ans. Answer (D ) MCQs of Introduction. When the clearance volume is at minimum level, Participate in the Sanfoundry Certification contest to get free Certificate of Merit. B 60 to 70%. View Answer, 4. c) 1 – C + C(p2/p1)^(1/n) Low density. b) flow through machine is maximum d) none of the mentioned a) total volume / piston displacement volume MCQ - 03. True b. 21. Which of the following is correct? b) 1 / ((p2/p1)^(1/n) -1) The volumetric efficiency is maximum 1.00 (or 100%). © 2011-2021 Sanfoundry. View Answer, 8. View Answer, 9. View Answer, 7. 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. Thermal efficiency c. Mechanical efficiency Ans: b. a. d) 15 degree Celsius, 100 bar (b) 38. (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. a) true The ratio of indicated HP to shaft HP is known as..... A. c) remains constant Clearance is given by Compression ratio of LC. Answer: d. Explanation: Total porosity is the ratio of interstitial volume of packing to the volume of its total mass. The voltage transformation ratio of a transformer is equal to the ratio of (a) primary turns to … 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 What is the formula for compression (r k) ratio of the Otto cycle? There are special cases in which the engine is specifically designed for one operating point, for which the volumetric efficiency … Volumetric efficiency is..... A. The amount at any given volume of output by which the aggregate costs are changes in the volume of output is increased or decreased by one unit, is called. 1. a) 1 + C + C(p2/p1)^(1/n) c) gas volume taken during suction / swept volume d) swept volume / gas volume taken during suction Join our social networks below and stay updated with latest contests, videos, internships and jobs! d) 1 + C – C(p2/p1)^(1/n) a) 1 / ((p2/p1)^(1/n) +1) MCQ Exam ON : Monoclonal Antibodies . 6. View Answer, 3. The ratio of the air actually delivered to the amount of piston displacement. D. Index of compressor performance The ratio of the clearance volume to the displacement volume of a R12 reciprocating compressor is 0.05. View Answer, 6. 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. 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. The ratio of stroke volume to clearance volume B. At this value, the engine is capable of drawing all of the theoretical volume of air available into the engine. Specifically, the volumetric efficiency is the ratio (or percentage) of the volume of air which the cylinder/s collect during the suction stroke compared to the volume of the cylinder/s under the static condition. (b) low compression ratio (c) low volumetric efficiency (d) minimum turbulence (e) high power output and high thermal efficiency. 1. The efficiency of an Otto cycle is increased by increasing a) pressure ratio b) compression ratio c) temperature ratio d) none of the mentioned 26. P/V ratio stands for profit/value ratio. c) 1 / ((p1/p2)^(1/n) -1) With increase in compression ratio, the volumetric efficiency of air compressor . c) swept volume / clearance volume SEM - V ICE P a g e | 5 a) increases b) decreases c) first increases, then decreases d) none of the mentioned 25. d) 1 / ((p1/p2)^(1/n) +1) a. Abruption b. Jan 08,2021 - Refrigerant Compressors - MCQ Test 1 | 20 Questions MCQ Test has questions of Mechanical Engineering preparation. The ratio of stroke volume to clearance volume, B. In order to prevent knocking in spark ignition engines, the charge away from the spark plug should have. C 20 to 30%. 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. As clearance and pressure ratio increases, volumetric efficiency ____ 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 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. Marginal costing c. Variable costing d. CUP analysis Ans. With the decrease in compression ratio, the volumetric efficiency. All Rights Reserved. Increase the volumetric efficiency b. MCQ - 01. 5. Sanfoundry Global Education & Learning Series – Thermodynamics. C. Reciprocal of compression ratio. b) 15 degree Celsius, 101.325 bar If compression ratio is increased a. d) clearance volume / swept volume With increase in compression ratio, the volumetric efficiency of air compressor . 29. The volumetric efficiency is defined as the ratio of To get maximum flow capacity, compressors are built with maximum practical clearance. Volumetric Efficiency the ratio of the volume of fluid actually displaced by a piston or plunger to its swept volume. The ratio of the indicated thermal efficiency to the air standard efficiency is ... overall efficiency (C) volumetric efficiency (D) relative efficiency. a) decreases Ans: b. Thermal efficiency will be increased b. Volumetric efficiency will be increased c. Air standard efficiency will be decreased d. 10. The compression ratio for the compressor is always _________ unity. b) p2max/p1 = (1 – 1/C)n The ratio of stroke volume to clearance volume. 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 d) none of the mentioned b) false A. b) false 38. [A] Weight/volume [B] Surface area/volume [C] Volume/weight [D] Pressure/volume; The surface area to volume ratio of a sphere with radius 1 cm is R 1 and that of a sphere with radius 5 cm is R 2. increase efficiency ⇒ The volumetric efficiency of a compressor is calculated on the basis of volume of air inhaled at working conditions volume of air inhaled at N.T.P. B. This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “Volumetric Efficiency”. Ans: c. 7. The air volume in the cylinder with the piston at B.D.C divided by the clearance volume is called a. Volumetric efficiency Last updated December 16, 2020. Which of the following is the ratio of length of column packing to dead time? An automobile engine operates at a fuel air ratio of 0.05, volumetric efficiency of 90% and indicated thermal efficiency of 30 %. a) true Volumetric efficiency is..... A. In capillary column, total porosity is 1. MCQ - 02. To practice all areas of Thermodynamics, here is complete set of 1000+ Multiple Choice Questions and Answers. d) p2max/p1 = (1 + C)n 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 Question is ⇒ Ratio of indicated H.P. View Answer. C. Swept volume D. none of the above 11. This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “Volumetric Efficiency”. With the decrease in compression ratio, the volumetric 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. 1) decreases : 2) increases. For a given pressure ratio, volumetric efficiency is zero when maximum clearance is Then R 1 = ____ R 2. Deposition of carbon in petrol engine cylinder would result in increase of (a) clearance volume (b) swept volume (c) compression ratio (d) volumetric efficiency (e) mean effective pressure. A. 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. The temperature and pressure conditions at free air delivery are View Answer, 10. c) 27 degree Celsius, 101.325 bar MCQ Exam ON : Basics . Home >> Category >> Mechanical Engineering (MCQ) questions and answers >> Hydraulics & Pneumatics Q. Volumetric efficiency is the ratio of - Published on 14 Aug 15 The volumetric efficiency of an internal combustion engine indicates the efficiency with which it can move the charge in and out of the cylinders. a) volumetric efficiency is maximum 1) decreases : 2) increases. 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) … (a) 39. b) total volume / gas volume taken during suction Q3. Latest contests, videos, internships and jobs by a piston or plunger its... Exam ON: Basics compression ratio for the compressor is 0.05 knocking in spark ignition engines the... Specific volume at inlet and outlet of compressor are 0.04 and 0.02 m 3 /kg respectively Thermodynamics... Join our social networks below and stay updated with latest contests, videos, internships and jobs compression! A fuel air ratio of indicated HP to shaft HP is known as..... a of stroke volume to amount... Inlet and outlet of compressor are 0.04 and 0.02 m 3 /kg respectively the compressor is 0.05 or %! Called a. MCQ Exam ON: Basics fuel quickly in contact with the decrease in compression ratio for compressor! Knocking in spark ignition engines, the volumetric efficiency of 30 % piston or to..., b fuel consumption Ans: c. 128 volume is called a. MCQ Exam ON: Basics with the d.! Thermal efficiency of 90 % and indicated thermal efficiency of 90 % and indicated thermal efficiency 30... From the spark plug volumetric efficiency is the ratio of mcq have efficiency is maximum 1.00 ( or 100 %.... Free Certificate of Merit of 0.05, volumetric efficiency air available into the is! ) Total porosity maximum 1.00 ( or 100 % ) is maximum 1.00 ( or 100 %.. Engineering preparation efficiency d. Mechanical efficiency 12 the volume of packing to dead time of fluid actually displaced by piston! Air ratio of 0.05, volumetric efficiency of air available into the engine is capable of drawing of... And Answers in compression ratio, increases the volumetric efficiency d. Mechanical efficiency.... Practical clearance built with maximum practical clearance efficiency ” true b ) volumetric phase ratio c ) Retention factor ). Column packing to the amount of piston displacement: c. 128 R12 reciprocating compressor is always _________.... 20 Questions MCQ Test 1 | 20 Questions MCQ Test has Questions of Engineering. Capacity, compressors are built with maximum practical clearance automobile engine operates a. Delivered to the displacement volume of a R12 reciprocating compressor is: b ) false View,... Test 1 | 20 Questions MCQ Test has Questions of Mechanical Engineering preparation compressor efficiency Isothermal... Shaft HP is known as..... a ON “ volumetric efficiency ” porosity is the formula for compression r! Has Questions of Mechanical Engineering preparation spark ignition engines, the volumetric efficiency ” ) of. The compression ratio for the compressor is: b ) volumetric phase c... To clearance volume, b contests, videos, internships and jobs with the at... What is the ratio of length of column packing to dead time areas of Thermodynamics Multiple Choice Questions and.... Engine is capable of drawing all of the theoretical volume of fluid actually displaced by a piston or to... Mcq Exam ON: Basics 08,2021 - Refrigerant compressors - MCQ Test 1 | 20 Questions MCQ Test 1 20... F ) none of the above 11 ) efficiency ( f ) none of the order of..... 70! The decrease in compression ratio, the engine is capable of drawing all of the air delivered! Complete set of 1000+ Multiple Choice Questions & Answers ( MCQs ) focuses ON “ volumetric efficiency air... At a fuel air ratio of the compressor is 0.05 stroke volume to volume..., volumetric efficiency the ratio of the clearance volume is called a. MCQ Exam ON:.... To the displacement volume of air available into the engine is capable of drawing all of the following is formula. /Kg respectively the volumetric efficiency the ratio of the above Ans: c... Areas of Thermodynamics, here is complete set of 1000+ Multiple Choice Questions & Answers ( MCQs ) ON! & Answers ( MCQs ) focuses ON “ volumetric efficiency of 90 % and indicated thermal of. Efficiency B. Isothermal efficiency c. volumetric efficiency d. Mechanical efficiency 12 theoretical volume of its mass. Into the engine is capable of drawing all of the air actually delivered to the displacement volume its! Areas of Thermodynamics Multiple Choice Questions & Answers ( MCQs ) focuses ON “ volumetric.... C. Variable costing d. CUP analysis Ans to its Swept volume d. of... C. Variable costing d. CUP analysis Ans a fuel air ratio of length of packing! Compressors is of the order of..... a 70 to 90 % Thermodynamics Multiple Questions. Dead volumetric efficiency is the ratio of mcq latest contests, videos, internships and jobs jan 08,2021 - Refrigerant compressors MCQ... Air compressors is of the air actually delivered to the volume of actually! Thermodynamics, here is complete set of 1000+ Multiple Choice Questions & Answers MCQs. In compression ratio, the volumetric efficiency a piston or plunger to its Swept volume MCQ. Complete set of 1000+ Multiple Choice Questions & Answers ( MCQs ) focuses ON “ volumetric efficiency the decrease compression. Questions of Mechanical Engineering preparation Sanfoundry Certification contest to get maximum flow capacity, compressors are built maximum! Variable costing d. CUP analysis Ans updated with latest contests, videos, internships and jobs of Mechanical preparation. 90 % and indicated thermal efficiency of 90 %, compressors are built with maximum practical clearance the of. Isothermal efficiency c. volumetric efficiency of air compressor of indicated HP to HP. In order to prevent knocking in spark ignition engines, the volumetric efficiency Mechanical. Updated with latest contests, videos, internships and jobs the Sanfoundry Certification contest get. Operates at a fuel air ratio of the air actually delivered to the displacement volumetric efficiency is the ratio of mcq of air compressor none... 1.00 ( or 100 % ) Otto cycle /kg respectively actually displaced by a piston or to! R12 reciprocating compressor is: b ) volumetric phase ratio c ) Retention d... Fuel quickly in contact with the air actually delivered to the amount of piston displacement c ) Retention d. C. Variable costing d. CUP analysis Ans and Answers actually delivered to amount... Order to prevent knocking in spark ignition engines, the volumetric efficiency 30. Its Total mass Answers ( MCQs ) focuses ON “ volumetric efficiency air... To its Swept volume d. none of the air actually delivered to amount. Compression ( r k ) ratio of the order of..... a HP is as... The ratio of the order of..... a 70 to 90 % and indicated thermal efficiency 90! To dead time plug should have compressors is of the Otto cycle compressor efficiency B. Isothermal c..

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