(a) Power consumption per unit of air delivered is low Required fields are marked *. (b) higher heating value (e) none of the above. Can't read the image? (b) pressure coefficient (a) burning fuel after gas turbine For a two stage compressor* if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will (a) A.C. electric motor (c) low freezing point (b) constant speed unloader (d) about 100% of swept volume (a) 20-30% (e) isothermal compression. Ans: e, 10. (b) open cycle Most of the Chemical Process Industries use compressors to achieve the desired Reaction pressure, Refrigeration effect … (d) inversely proportional to clearance volume (a) ityrequires very big cylinder (e) does not occur. (a) less power requirement 42. Ans: b, 142. C. Small quantity of air at low pressure. (e) none of the above. Dear Sir (e) 10%. (c) disc or feather type The multi stage compression as compared to single stage compression..... A. They are very friendly since they don’t produce much noise as compared to reciprocating compressor. (b) the ratio of the air actually delivered to the amount of piston displacement (a) better lubrication is possible advantages of multistage (e) unpredictable. Ans: d, 53. There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. If you need assistance in determining which reciprocating air compressor is best suited for your application, our nation-wide distributor network can assist. (b) at the tip (e) none of the above. (a) stainless steel (b) 75% (c) remain unaffected (e) none of the above. Ans: a, 190. (b) work done in subsequent stages should increase (e) 700°C. (c) large discharge at low pressure (c) 18 m3/mt’ Ans: a, 172. Euler’s equation is applicable for (c) It is best suited for compression ratios around 7:1 (d) enables compression in two stages Rotary compressors are suitable for a) Large discharge at high pressure b) Low discharge at high pressure c) Large discharge at low pressure d) Low discharge at low pressure (e) none of the above. (b) diffuser (a) compressor efficiency Ans: b, 133. (d) increased inclination of chord with air steam (d) increase efficiency (b) isothermal compression (e) isothermal work to ideal work. (a) increase (e) 25°C, 1 kg/cm2 and relative humidity of 50%. (a) control temperature (e) unpredictable. Ans: e, 193. (c) small quantity of air at low pressure Ans: b, 61. (d) N.T.P. (e) 12:1. (d) blade effectiveness Ans: b, 24. (b) compressed air (d) all of the above Ans: e, 26. (b) 1.5 m3/mt (d) depends on on odier considerations (b) adiabatically 41) Rotary compressor is best suited for. (b) more (e) angular momentum. Ans: a, 79. (b) adiabatic (a) 1.03 kg/cm2 Volumetric efficiency of air compressors is of the order of (a) atmosphere The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called Latest Compressors, Gas Turbines and Jet Engines Questions and Answers Pdf 1. (e) any one of the above. The blades of gas turbine are made of 186. (a) cool the air (c) Carnot cycle (a) reheating (c) centrifugal ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) ... Rotary compressor is best suited … (d) index of compressor performance Thrust of a jet propulsion power unit can be increased by Today we study of objective or mcq reciprocating compressor. (e) none of the above. (e) rocket principle for its operation. (b) two adiabatic and two isobaric 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. It is a part of the CSD model compressor pumps by Schulz that have been designed to offer you a compact and silent, yet powerful compressor.This alone makes the unit suited … (d) may increase/decrease depending on clearance volume (a) the propulsive matter is caused to flow around the propelled body (c) inlet pressure to exhaust pressure (c) velocity coefficient (a) is self-operating at zero flight speed Ans: b, 29. Ans: a, 108. It’s the best for offices, factories, and the industries. (c) 1.0% (b) 1050km/hr Hydraulic Machines MCQ Quiz & Online Test: Below is a few Hydraulic Machines MCQ test that checks your basic knowledge of Hydraulic Machines. (d) all of the above (d) 1 : 10 Advantages of rotary compressor. (d) moisture free air (c) convert pressure energy into kinetic energy Ans: a, 134. Rotary Screw Champion's LRS Series variable speed compressors can efficiently and reliably handle the varying air demand. (d) decreasing the turbine work The best isn't necessarily the one that's expensive or packed with the best features. Turbofan engine employs Ans: 187. Ans: a, 48. (c) 20 : 1 Please mail PDF of all topic related mechanical MCQ Rotary Screw Champion's LRS Series variable speed compressors can efficiently and reliably handle the varying air demand. (e) from any one of the above locations. Ans: c, 71. (A) start-stop motor (B) constant speed unloader (X) (C) relief valve (X) (D) variable speed (X) (E) none of the above (X) Answers: During base load operation, the best method of controlling compressor is start-stop motor. Ans: c, 125. Stalling of blades in axial flow compressor is the phenomenon of Ans: c. 89. (c) 0°C and standard atmospheric conditions In the axial flow gas turbine, the work ratio is the ratio of (c) half the jet velocity (c) slightly less than atmospheric (a) multi-stage compression (d) isentropic compression (a) radial component Werther International Inc., in partnership with FIAC, is committed to offering the most extensive and versatile line of high-efficiency Rotary Screw Air Compressors ranging from 3 to 100 Hp and producing from 10 to 560 CFM of air. Ans: d, 143. (a) start-stop motor Reciprocating compressor: the compressor compresses the air with the pistons that always move up and down inside the cylinder.. Rotary compressors: The compressor has two rotors that usually run in the opposite directions.They trap the air between causing the compression to occur. The- most efficient method of compressing air is to compress it (b) after intercooler (e) none of the above. (c) requires no air for its operation Improves volumetric efficiency for the given pressure ratio B. In jet engines, paraffin is usually used as the fuel because of its (c) 0°C and standard atmospheric conditions Ans: d, 191. (c) chemical rocket regine (b) compressed air before entering the combustion chamber is heated a) Isentropic compression. Ans: c, 200. Ans: c, 194. Rotary. (e) none of the above. For slow-speed large capacity compressor, following type of valve will be best suited (a) poppet valve (b) mechanical valve of the corliss, sleeve, rotary or semirotary type (c) disc or feather type (d) any of the above (e) none of the above. (e) isentropic increase/drop in tempera¬ture and actual increase/ drop in temperature. Ans: d, 139. Which of the following fuels can be used in turbojet engines (e) axial flow compressors apt to be longer as compared to centrifugal type. (c) mechanical balance is better Therefore temperature of air leaving the impeller is higher than the isentropic compression. (b) maximum cycle temperature Rotary vane compressors run at a conservative slow speed, making them extremely reliable and extending the life of the machine. (e) depends on electrical energy supplied by solar cells. (e) high stroke. (a) turbo-jet (b) 2000°C (e) methyl alcohol (b) reduce turbine size (c) small frontal area and high h.p. (d) convert kinetic energy into pressure energy (c) propulsive power and fuel input Rotary screw compressors can be run at lower temperatures for 24 hours per day, 365 days a year. Pick up the wrong statement about advantages of multistage compression Ans: b, 223. (a) varies as square root of the speed (e) none of the above. Click here for the answer of Rotary compressor is best suited for_____? Ans: b, 62. (b) energy (c) 4 : 1 Pick up the wrong statement (a) closed cycle (b) intake temperature and pressure conditions Ans: a, 7. (a) standard air (e) unpredictable. A simple turbo-jet engine is basically Oct 15,2020 - Compressors - 3 | 20 Questions MCQ Test has questions of Mechanical Engineering preparation. Ans: d, 41. (d) 14.7 kg/cm2 (a) atmospheric conditions at any specific location (b) 1 : 2 (b) isothermal (a) to increase the output (e) none of the above. (b) better mechanical balance (c) petrol engine (c) 1 : 4 Ans: c, 81. (e) unpredictable. Ans: b, 33. 1 m of air at atmospheric condition weighs approximately Maximum delivery pressure is a rotary air compressor is of the order of The speed of the rotary compressor … (d) may increase/decrease depending on compressor clearance (d) 2.2 kg (a) h.p. Rotary screw compressors are much easier to take care of than the other types of compressors. (e) unpredictable. The thermodynamic efficiency of rotary compressor is based on This causes heating of air during compression process. (e) 1.5 Ans: b, 3. (a) more (d) dependent on other factors Ans: b, 18. (b) decreases with increase in compression ratio Whether you need a single stage or multi stage reciprocating compressor, Champion has a product to meet your requirements. (c) 60% Ans: a, 154. (a) gas turbine is a self-starting unit The multi – stage compression of air as compared to … (a) 3.5 : 1 Ans: c, 138. (d) closed/open depending on other con-siderations (e) no such co-relationship with jet velocity exists. (a) one adiabatic, two isobaric, and one constant volume (a) 0.1% The closed cycle in gas turbines sir please upload pdf file for all the topics. (a) less (a) increases (b) axial flow (d) pressures across the turbine (d) may be less or more depending on ambient conditons Compressed air is the end goal, which requires the use of atmospheric air, but the oil is just as important. Ans: b, 58. (b) it greatly affects volumetric efficiency Ans: a, 222. (b) two or more air streams (b) h.p. (b) output and input (d) work done in all stages should be equal Ans: a, 56. (b) same as adiabatic B. Separators in compressor installations are located (c) aerofoil blades are used (d) oxygen alone (c) reciprocal of compression ratio You have to select the right answer to a question. (e) unpredictable. (b) adding heat exchanger (c) is not dependent upon compressin ratio (B) mechanical valve of the corliss, sleeve, rotary or semirotary type (X) (C) disc or feather type (D) any of the above (X) (E) none of the above (X) Answers: For slow-speed large capacity compressor, following type of valve will be best suited disc or feather type. (e) none of the above. (e) gas turbine. (c) unsteady, periodic and reversed flow (b) higher at high altitudes (b) less power (e) none of the above. (a) 1 : 1.2 (c) control fire hazards (b) passing steam over incandescent coke Pick up the false statement (b) provides lesser flexibility Ans: c, 196. What will be the volume of air at 327°C if its volume at 27°C is 1.5 m3/mt (e) isobaric. (d) all of the above (e) Outlet temperature is reduced. (c) 1500°C (d) turbine and combustion chamber (e) gas and no air. The thermal efficiency of a simple gas turbine for a given turbine inlet temperature with increase in pressure ratio (d) first increases and then decreases Ans: a, 8. Short cut notes / rapid fire notes / best theory of Compressors, Gas Turbines and Jet Engines, Mechanical Engineering Multiple Choice Questions / Objective type questions, MCQ's, with question and answers, download free PDF, Mechanical Engineering, Multiple Choice Questions, Objective type questions, Mechanical Engineering short notes, rapid fire notes, best theory (e) increase degree of reaction. (b) compression ratio (e) lower volumetric efficiency. (a) heated For actual single stage centrifugal compressor, the maximum pressure ratio is of the order of Male reproduction and infertility MCQ Wound Repair And Care MCQ Thermo Electricity MCQ Investment MCQ Alchohols MCQ Networking MCQ Softwares MCQ Phylum - Annelida MCQ Biological Classification MCQ Chemical Process MCQ H.C.F and L.C.M MCQ Php Programming MCQ (b) higher pressure ratio per stage (d) solid fuel firing Volumetric efficiency of a compressor without clearance volume (e) unpredictable. Ans: a, 102. (a) toughness (d) combination of above (a) same The net work input required for compressor with increase in clearance volume (a) equal to zero The ideal efficiency of simple gas turbine cycle depends on (b) more loss of air due to leakage past the cylinder (e) bulk modulus. Reduces work done per kg of air C. Reduces cost of compressor D. Gives more uniform torque E. All of the above (e) all of the above. Ans: b, 100. (d) diesel engine (c) botii isothermal and adiabatic compression Which is the negative grid voltage for a given plate potential at which ionization of the gas starts? (c) actual total head tempeature drop to the isentrpic total head drop from total head inlet to static head outlet (c) be laid vertically (c) minimum cycle temperature (b) maximum cycle temperature alone (e) it is never done. (c) increase power output (a) to supply base load requirements An ideal air compressor cycle with clearance on p-v diagram can be represented by following processes (b) highest (b) axial component This test is Rated positive by 89% students preparing for Mechanical Engineering.This MCQ test is related to Mechanical Engineering syllabus, prepared by Mechanical Engineering teachers. But in rotary compressor there is high friction and eddies formation due to high velocity air through the compressor. Gas turbines use following type of air compressor (e) none of the above. (a) larger air handling ability per unit frontal area (a) top side of main With increase in turbine temperature, the value of pressure ratio for the peak efficiency would (b) is not self-operating at zero^flight speed (b) twice the jet velocity (c) in a single phase Fighter bombers use following type of engine As always, reach out to your local, authorized Gardner Denver distributor for assistance in evaluating which oil-free or oil-less air compressor is best suited for your …