Mechanical Mechanical Engineering MCQs Set 3 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 6 Created on March 17, 2022 Mechanical Engineering MCQS Set 3 NameEmailPhone Number 1 / 20 Volumetric efficiency is_____________________? the ratio of stroke volume to clearance volume the ratio of the air actually delivered to the amount of piston displacement reciprocal of compression ratio index of compressor performance proportional to compression ratio 2 / 20 Compression efficiency is compared against_____________________? ideal compression adiabatic compression botii isothermal and adiabatic compression isentropic compression isothermal compression 3 / 20 Volumetric efficiency of air compressors is of the order of________________? 20-30% 40-50% 60-70% 70-90% 90-100% 4 / 20 Clearance volume in actual reciprocating compressors is essential __________________? to accommedate Valves in the cylinder head to provide cushioning effect to attain high volumetric efficiency to avoid mechanical bang of piston with cylinder head to provide cushioning effect and also to avoid mechanical bang of piston with cylinder head 5 / 20 The work done per unit mass of air in compression will’be least when n is equal to______________? 1 1.2 1.3 1.4 1.5 6 / 20 Out of the following, from where you will prefer to take intake for air compressor_________________? from an air conditioned room maintained at 20°C from outside atmosphere at 1°C from coal yard side from a side where cooling tower is located nearby from any one of the above locations 7 / 20 Ratio of indicated h.p. to shaft h.p. in known as__________________? compressor efficiency isothermal efficiency volumetric efficiency mechanical efficiency adiabatic efficiency 8 / 20 The clearance volume of the air compressor is kept minimum because____________________? it allows maximum compression to be achieved it greatly affects volumetric efficiency it results in minimum work it permits isothermal compression none of the above 9 / 20 Which is false statement about multistage compression ? Power consumption per unit of air delivered is low Volumetric efficiency is high It is best suited for compression ratios around 7:1 The moisture in air is condensed in the intercooler Outlet temperature is reduced 10 / 20 Volumetric efficiency of a compressor with clearance volume ________________? increases with increase in compression ratio decreases with increase in compression ratio in not dependent upon compression ratio may increase/decrease depending on compressor capacity unpredictable 11 / 20 An ideal air compressor cycle with clearance on p-v diagram can be represented by following processes_______________? one adiabatic, two isobaric, and one constant volume two adiabatic and two isobaric two adiabatic, one isobaric and one constant volume, one adiabatic, one isobaric and two constant volume two isobaric, two adiabatic and one constant volume 12 / 20 Which is false statement about air receivers ___________________? These are used to dampen pulsations , These act as reservoir to- take care of sudden demands These increase compressor efficiency These knock out some oil and moisture These reduce frequent on/off operation of compressors 13 / 20 Volumetric efficiency of a compressor without clearance volume________________? increases with increase in compression ratio decreases with increase in compression ratio is not dependent upon compressin ratio may increase/decrease depending on compressor capacity unpredictable 14 / 20 Ratio of compression is the ratio of__________________? gauge discharge pressure to the gauge intake pressure absolute discharge pressure to the ab-solute intake pressure pressures at discharge and suction cor-responding to same temperature stroke volume and clearance volume none of the above 15 / 20 Aeroplanes employ following type of compressor_______________? radial flow axial flow centrifugal combination of above none of the above 16 / 20 Euler’s equation is applicable for__________________? centrifugal compressor axial compressor pumps all of the above none of the above 17 / 20 The ratio of work doen per cycle to the swept volume in case of compressor is called ______________? compression index compression ratio compressor efficiency mean effective pressure compressor effectiveness 18 / 20 Ratio of indicated H.P. and brake H.P. is known as_________________? mechanical efficiency volumetric efficiency isothermal efficiency adiabatic efficiency relative efficiency 19 / 20 Cylinder clearance in a compressor should be _________________? as large as possible as small as possible about 50% of swept volume about 100% of swept volume none of the above 20 / 20 The net work input required for compressor with increase in clearance volume_____________________? increases decreases remains same increases/decreases depending on com-pressor capacity unpredictable Your score is LinkedIn Facebook Twitter VKontakte 0% Restart quiz Please rate this quiz Send feedback
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