Mechanical Engineering MCQs

Page No. 84

If one cylinder of a diesel engine receives more fuel than the others, then for that cylinder the________________?


aexhaust will be smoky


bpiston rings would stick into piston grooves


cexhaust temperature will be high


dscavenging occurs


View Answer scavenging occurs

The inlet value of a four stroke cycle I.C engine remains open for nearly___________________?


a180°


b125°


c235°


d200°


View Answer 235°

The specific fuel consumption per BH hour for a petrol engine is approximately__________________?


a0.15 kg


b0.2 kg


c0.25 kg


d0.3kg


View Answer 0.25 kg

Crankcase explosion in I.C. engines usuall occurs as ___________________?


afirst a mild explosion followed by a bi explosion


bfirst a big explosion followed by a mil explosion


cboth mild and big explosions occi simultaneously


dnever occurs



The fuel in diesel engine is normally injected at pressure of_________________?


a5-10 kg/cm2


b20-25 kg/cm2


c60-80 kg/cm2


d90-130 kg/cm2


View Answer 90-130 kg/cm2

The maximum temperature in the I.C. engine cylinder is of the order of ________________?


a500- 1000°C


b1000- 1500°C


c1500-2000°C


d2000-2500°C


View Answer 2000-2500°C

The pressure and temperature at the end of compression stroke in a petrol engine are of the order of___________________?


a4 – 6 kg/cm2 and 200 – 250°C


b6 – 12 kg/cm2 and 250 – 350°C


c12 – 20 kg/cm2 and 350 – 450°C


d20 – 30 kg/cm2 and 450 – 500°C



In case of gas turbines, the gaseous fuel consumption guarantees are based on________________?


ahigh heat value


blow heat value


cnet calorific value


dmiddle heat value


View Answer low heat value

Fuel oil consumption guarantees for I .C. engine are usually based on__________________?


alow heat value of oil


bhigh heat value of oil


cnet calorific value of oil


dcalorific value of fuel



All heat engines utilize_____________________?


alow heat value of oil


bhigh heat value of oil


cnet claorific value of oil


dcalorific value of fuel


View Answer low heat value of oil

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