Mechanical Engineering MCQs

Page No. 51

For low speed operation or for idling in petrol engines, the engine requirements are for_______________?


alean mixture


btheoretically correct mixture


crich mixture


dany type of mixture


View Answer rich mixture

Power impulses from an I.C. engine are somoothed out by__________________?


agovernor


bcrank shaft


cgear box


dflywheel


View Answer flywheel

In carburettors, the top of the fuel jet with reference to the level in the float chamber is kept at_________________?


asame level


bslightly higher level


cslightly lower level


dmay be anywhere


View Answer slightly higher level

In petrol engines, the maximum power is developed corresponding to relative fuel air ratio of________________?


a0.85


b1


c1.1 to 1.3


d1.2 to 1.5


View Answer 1.1 to 1.3

In petrol engine, increase of cooling water temperature will_________________?


aincrease the knocking tendency


bdecrease the knocking tendecny


cnot affect the knocking tendency


dincrease or decrease knocking tendency depedning on strength and time of spark



The pour point of diesel oil must be_________________?


alower than the coldest atmospheric temperature at which oil is to be pumped


bhigher than above


chas no such relation


dmore than 100°C



High carbon content in diesel oil used for diesel engine leads to_________________?


aproduction of highly corrosive gases corroding the cylinder walls and exhaust system


bexcessive engine wear


cdamaging of both the storage tank and the engine


ddeposition on engine parts



Ignition timing of a multicylider petrol engine can be adjusted by_________________?


arotating the crank


badjusting the spark plug gap


cadjusting ignition coil position


drotating the distributor



The cooling water requirement for diesel engine is of the order of________________?


a0.2 to 1.0 liter per minute per h.p.


b1 to 3 liters per minute per h.p.


c5 to 10 liters per minute per h.p


d10 to 20 liters per minute per h.p.



Leakage past the piston rings and valve seats in I.C. engines with increase in speed_______________?


aincreases.


bdecreases


cremains same


dunpredictable


View Answer decreases

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