Mechanical Engineering MCQs

Page No. 80

The pressure at the end of compression in the case of diesel engine is of the order of___________________?


a6 kg/cm


b12kg/cmz


c20 kg/cmz


d35 kg/cm


View Answer 35 kg/cm

In a typical medium speed 4-stroke cycle diesel engine the inlet valve_____________________?


aopens at 20° before top dead center and closes at 35° after the bottom dead center


bopens at top dead center and closes at bottom dead center


copens at 10° after top dead center and closes 20° before the bottom dead center


dmay open or close anywhere



An engine indicator is used to determine the following___________________?


aspeed


btemperature


cvolume of cylinder


dm.e.p. and I.H.P.


View Answer m.e.p. and I.H.P.

If the intake air temperature of I.C. engine increases, its efficiency will_________________?


aincrease


bdecrease


cremain same


dunpredictable


View Answer decrease

The ratio of indicated thermal efficiency to the corresponding air standard cycle efficiency is called__________________?


anet efficiency


befficiency ratio


crelative efficiency


doverall efficiency


View Answer relative efficiency

In a diesel engine, the fuel is ignited by___________________?


aspark


b injected fuel


cheat resulting from compressing air that is supplied for combustion


dignition



The air standard efficiency of an Otto cycle compared to diesel cycle for the given compression ratio is__________________?


asame


bless


cmore


dmore or less depending on power rating


View Answer more

Does the supply of scavenging air at a density greater than that of atmosphere mean engine is supercharged ?


ayes


bno


cto some extent


dunpredictable


View Answer no

Scavenging air in diesel engine means___________________?


aair used for combustion sent under pres-sure


bforced air for cooling cylinder


cburnt air containing products of combustion


dair used for forcing burnt gases out of engine’s cylinder during the exhaust period



The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft___________________?


a1/2


b1


c2


d4


View Answer 2

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