Mechanical Engineering MCQs

Page No. 53

The ratio of useful power; engine friction exhaust gas losses; cooling water, air and oil losses for a diesel engine is of the order of____________________?


a5:25:30:50


b25:35:5:35


c25:5:10:60


d25:5:35:35


View Answer 25:5:35:35

Air injection in I.C. engines refers to injection of___________________?


aair only


bliquid fuel only


cliquid fuel and air


dsupercharging


View Answer liquid fuel and air

With increase in speed of vehicle, the back pressure will________________?


adecrease


bincrease


cremain unalfected


ddepend on other factors


View Answer increase

A 4-stroke diesel engine needs about following amount of air_________________?


a75 cc per min. per h.p.


b750 cc per min. per h.p.


c7500 cc per min. per h.p.


d75000 cc per min. per h.p.



Fuel consumption with increase in back pressure will________________?


aincrease


bdecrease


cremain unaffected


ddepend on other factors


View Answer increase

The ash content in diesel oil should bot be more than_______________?


a1%


b5%


c0.1%


d0.001%


View Answer 0.001%

A fuel will detonate less if it has___________________?


ahigher self ignition temperature


blower self ignition temperature


cproper self ignition temperature


dself ingition temperature has nothing to do with detonation



Pick up the wrong statement about supercharging __________________?


asupercharging reduces knocking in diesel engines


bthere can be limited supercharging in petrol engines because of detonation


csupercharging at high altitudes is essential


dsupercharging results in fuel economy



Pick up the false statement ?


aThermal efficiency of diesel engine i about 34%


bTheoretically correct mixture of air am petrol is approximately 15 : 1


cHigh speed compression engines operate on dual combustion cycle


dS.I. engines are quality-governed engines



Sulphur content in diesel oil should not be more than_________________?


a10%


b5%


c1%


d0.01%


View Answer 0.01%

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