Mechanical Engineering MCQs

Page No. 52

The function of a distributor in an automobile is to__________________?


adistribute charge, equally to all the cylinders

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bregulate power

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cfeed lub oil to all moving parts

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dtime the spark

✓


View Answer time the spark

For same power and same speed, the flywheel of a four stroke engine as compared to two-stroke I.C. engine will be________________?


asmaller

✖


bbigger

✓


csame size

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ddependent on other engine parameters

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View Answer bigger

Solid injection in I.C. engines refers to injection of________________?


aliquid fuel only

✓


bliquid fuel and air

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csolid fuel

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dsolid fuel and air

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View Answer liquid fuel only

The m.e.p. of a petrol engine first increases as the fuel air ratio is increased and then decreases on further increase in fuel air ratio. The M.E.P is maximum in the zone of________________?


alean mixture

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bchemically correct mixture

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crich mixture

✓


dunpredictable

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View Answer rich mixture

The thermal efficiency of a two cycle engine as compared to four cycle engine is_________________?


amore

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bless

✓


csame

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dmore upto some load and then less

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View Answer less

Exhaust pipes of engines are covered with insulating marterial in order to_________________?


akeep the exhaust pipes warm

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breduce formation of condenstae

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creduce heat transfer to the engine room

✓


dincrease engine efficiency

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Auto-ignition reaction time for petrol engine first decreases with increase in fuel air ratio, reaches a minimum value and then increases with subsequent increase in fuel air ratio. The minimum value occurs in the region of________________?


aLean mixture

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bChemically correct fuel air ratio

✓


cRich mixture

✖


dUnpredictable

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Diesel engines as compared to petrol engines require ______________________?


abigger flywheel

✓


bsmaller flywheel

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csame size flywheel

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dno flywheel

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View Answer bigger flywheel

The specific fuel consumption for a petrol engine first decreases with increase in fuel air ratio and then increases with further increase in fuel air ratio. The minimum value occurs in the range of__________________?


alean mixture

✓


bchemically correct mixture

✖


crich mixture

✖


dunpredictable

✖


View Answer lean mixture

The system of lubrication used for motor cycles and scooters is by________________?


aforced lubrication system

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bsplash lubrication

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capplying grease under pressure

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dmixing about 5% lub oil with petrol

✓



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