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

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c20 kg/cmz

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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

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dmay open or close anywhere

✖



An engine indicator is used to determine the following___________________?


aspeed

✖


btemperature

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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

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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

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bforced air for cooling cylinder

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cburnt air containing products of combustion

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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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