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


coil sludge in the engine crank case


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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