Mechanical Engineering MCQs

Page No. 49

In the case of petrol engine at maximum output, the percentage of CO in exhaust gases is ____________________?


aZero


b5-10%


cDepends on load and quality of fuel


dConsiderable percent


View Answer Considerable percent

All the four operations in two stroke engine are performed in following number of revolutions of crank shaft______________________?


aHalf


bOne


cTwo


dFour


View Answer One

As the number of cylinders in multi-cylinder engine increases, the power to weight ratio_______________?


aDecreases


bIncreases


cRemains same


dRemains same


View Answer Decreases

The termal efficiency of a petrol engine at design load is around_________________?


a90%


b50%


c40%


d30%


View Answer 30%

Method of governing used in petrol engine is________________?


aquantity governing


bquality governing


ccombined governing


dpartial governing


View Answer quantity governing

Method of governing used in diesel engine is__________________?


aquantity governing


bquality governing


cquality governing


dpartial governing


View Answer quality governing

In isochronous governing, speed droop is_______________?


a100%


b50%


c5%


d30%


View Answer 30%

An engine has a normal speed of 960 r.p.m. and no load speed of 1000 r.p.m. The speed droop of governor will be about___________________?


a2%


b4%


c8%


d±4%


View Answer 4%

If diesel is fed by mistake in the oil tank of a petrol engien, then engine will________________?


agive lot of smoke


bdetonate


cknock


dnot run


View Answer not run

For the same size and weight, a two stroke engine as compared to four stroke engine will generate power_________________?


aabout twice


babout 0.5 times


cnearly equal


dnearly equal


View Answer nearly equal

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