Mechanical Engineering MCQs

Page No. 77

Installation of supercharger on a four-cycle diesel engine can result in the following percentage increase in power_____________?


aupto 25%

✖


bupto 35%

✖


cupto 50%

✖


dupto 100%.

✓


View Answer upto 100%.

The mean effective pressure obtained from engine indicator indicates the________________?


amaximum pressure developed

✖


bminimum pressure

✖


cinstantaneous pressure at any instant

✖


daverage pressure

✓


View Answer average pressure

In a typical medium speed 4 stroke cycle diesel engine_______________?


aexhaust valve opens at 35° before bot-tom dead center and closes at 20° after top dead center

✓


bexhaust valve opens at bottom ‘dead center and closes at top dead center

✖


cexhaust valve opens just after bottom dead center and closes just before top dead center

✖


dmay open and close anywhere

✖



Supercharging is essential in_____________?


adiesel engines

✖


bgas turbines

✖


cpetrol engines

✖


daircraft engines

✓


View Answer aircraft engines

The reason for supercharging in any engine is to________________?


aincrease efficiency

✖


bincrease power

✖


creduce weight and bulk for a given out-put

✓


deffect fuel economy

✖



The actual volume of fresh charge admitted in 4-stroke petrol engine is_________________?


aequal to stroke volume

✖


bequal to stroke volume and clearance volume

✖


cless than stroke volume

✓


dmore than stroke volume

✖



The fuel air ratio in a petrol engine fitted with suction carburettor, operating with dirty air filter as compared to clean filter will be________________?


ahigher

✓


blower

✖


cremain unaffected

✖


dunpredictable

✖


View Answer higher

Excess quantities of sulphur in diesel fuel are Objectionable because it may cause the following______________? Which of the following is false statement?


apiston ring and cylinder wear

✖


bformation of hard coating on piston skirts

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coil sludge in the engine crank case

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ddetonation

✓


View Answer detonation

The size of inlet valve of.an engine in comparison to exhaust valve is_________________?


amore

✖


bless

✓


csame

✖


dmore/less depending on capacity of engine

✖


View Answer less

The specific fuel consumption of a petrol engine compared to diesel engine of same H.P. is_______________?


asame

✖


bmore

✓


cless

✖


dless or more depending on operating conditions

✖


View Answer more

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