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