Mechanical Engineering MCQs

Page No. 52

The function of a distributor in an automobile is to__________________?


adistribute charge, equally to all the cylinders


bregulate power


cfeed lub oil to all moving parts


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


ddependent on other engine parameters


View Answer bigger

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


aliquid fuel only


bliquid fuel and air


csolid fuel


dsolid fuel and air


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


bchemically correct mixture


crich mixture


dunpredictable


View Answer rich mixture

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


amore


bless


csame


dmore upto some load and then less


View Answer less

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


akeep the exhaust pipes warm


breduce formation of condenstae


creduce heat transfer to the engine room


dincrease engine efficiency



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


bChemically correct fuel air ratio


cRich mixture


dUnpredictable



Diesel engines as compared to petrol engines require ______________________?


abigger flywheel


bsmaller flywheel


csame size flywheel


dno flywheel


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


bsplash lubrication


capplying grease under pressure


dmixing about 5% lub oil with petrol



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