Engineering MCQs Mechanical Mechanical Engineering MCQs Set 1 March 18, 2022March 18, 2022 0 Mechanical Engineering MCQs for Job Test and Interview Preparation, Graduates, Students, Competition Exams, and more. Machine Design, Machine Theory, Hydraulic Machines, and other topics are covered in this set of multiple-choice problems. /20 0 votes, 0 avg 15 Created on March 17, 2022 Mechanical Engineering MCQS Set 1 NameEmailPhone Number 1 / 20 The advantage of multistage compression over single stage compression is ________________? lower power consumption per unit of air delivered higher volumetric efficiency decreased discharge temperature moisture free air all of the above 2 / 20 The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation___________________? 0.1% 0.5% 1.0% 5% 10%. 3 / 20 As the value of index ‘«’ is decreased, the volumetric efficiency will___________________? increase decrease remain unaffected may increase/decrease depending on compressor clearance none of the above 4 / 20 The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature__________________? 0.1% 0.5% 1% 5% 10%. 5 / 20 The criterion of the thermodynamic efficiency for rotary compressor is_________________? isentropic compression isothermal compression polytropic compression any one of the above none of the above 6 / 20 The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called__________________? slip factor velocity factor velocity coefficient blade effectiveness 7 / 20 For supplying intermittent small quantity of air at high pressure, following compressor is best suited__________________? centrifugal reciprocating axial screw turbo jet 8 / 20 The maximum compression ratio in an actual single stage axial flow comperssor is of the order of________________? 1 : 1.2 1 : 2 1 : 5 1 : 10 1 : 1 9 / 20 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___________________? increase decrease remain unaffected other factors control it unpredictable 10 / 20 Phenomenon of choking in compressor means __________________? no flow of air fixed mass flow rate regardless of pressure ratio reducing mass flow rate with increase in pressure ratio increased inclination of chord with air steam does not occur 11 / 20 For minimum work in multistage compression, assuming same index of compression in all stages_________________? work done in first stage should be more work done in subsequent stages should increase work done in subsequent stages should decrease work done in all stages should be equal work done in any stage is no criterion for minimum work but depends on other factors 12 / 20 Pick up the wrong statement about advantages of multistage compression____________________? better lubrication is possible advantages of multistage more loss of air due to leakage past the cylinder mechanical balance is better air can be cooled perfectly in between more uniform torque, light cylinder and saving in work 13 / 20 The ratio of isentropic work to Euler work is known as_____________________? pressure coefficient work coefficient polytropic reaction slip factor compressor efficiency 14 / 20 In a compressor, free air delivered is the actual volume delivered at the stated pressure reduced to ____________________? N.T.P. conditions intake temperature and pressure conditions 0°C and 1 kg/cm2 20°C and 1 kg/cm2 none of the above 15 / 20 Diffuser in a compressor is used to _____________________? increase velocity make the flow stream-line convert pressure energy into kinetic energy convert kinetic energy into pressure energy increase degree of reaction 16 / 20 The ratio of isentropic work to euler’s work is known as _____________________? compressor efficiency isentropic efficiency Euler’s efficiency pressure coefficient pressure ratio 17 / 20 Losses in a centrifugal compressor are due to__________________? inlet losses impeller channel losses diffuser losses all of the above none of the above 18 / 20 Which is false statement about advantages of multistage compressor in comparison to single stage compressor_________________? less power requirement better mechanical balance less loss of air due to leakage past the cylinder more effective lubrication lower volumetric efficiency 19 / 20 The indicated work per unit mass of air delivered is___________________? directly proportional to clearance volume greatly affected by clearance volume not affected by clearance volume inversely proportional to clearance volume 20 / 20 More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than____________________? 2 kg/cm2 6 kg/cm2 10 kg/cm2 14.7 kg/cm2 none of the above Your score is LinkedIn Facebook Twitter VKontakte 0% Restart quiz Please rate this quiz Send feedback
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