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