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

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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

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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

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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

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cdamaging of both the storage tank and the engine

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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.

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bdecreases

✓


cremains same

✖


dunpredictable

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View Answer decreases

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