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