Mechanical Engineering MCQs

Page No. 82

For the same power developed in I.C. engines, the cheaper system is_____________?


anaturally aspirated


bsupercharged


ccentrifugal pump


dturbo charger


View Answer supercharged

Flash point of fuel oil is __________________?


aminimum temperature to which1 oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame


btemperature at which it solidifies or congeals


ctemperature at which it catches fire without external aid


dindicated by 90% distillation temperature, i.e. when 90% of sample oil has distilled off



The operation of forcing additional air under pressure in the engine cylinder is known as________________?


ascavenging


bturbulence


csupercharging


dpre-ignition


View Answer supercharging

The magneto in an automobile is basically__________________?


atransformer


bd.c. generator


ccapacitor


dmagnetic circuit


View Answer d.c. generator

Which of the following is false statement. Some of the methods used to reduce diesel smoke are as follows ________________?


ausing additives in the fuel


bengine derating i.e. reducing the maxi-mum flow of fuel


cincreasing the compression ratio


dadherence to proper fuel specification



In a cycle, the spark lasts roughly for ____________________?


a1 sec


b0.1 sec


c0.01 sec


d0.001 sec


View Answer 0.001 sec

A diesel engine as compared to petrol engine (both running ar rated load) is ____________________?


amore efficient


bless efficient


cequally efficient


dunperdictable


View Answer more efficient

Most high speed compression engines operate on ___________________?


aOtto cycle


bDiesel cycle


cDual cycle


dCarnot cycle


View Answer Dual cycle

The cam shaft of a four stroke I.C. engine running at 1500 rmp will run at __________________?


a1500 rpm


b750 rpm


c3000 rpm


dany value independent of engine speed


View Answer 750 rpm

The term scavenging is generally associated with______________________?


a2-stroke cycle engines


b4-stroke cycle engines


caeroplane engines


dhigh efficiency engines



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