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

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bpiston rings would stick into piston grooves

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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

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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

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cboth mild and big explosions occi simultaneously

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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

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b1000- 1500°C

✖


c1500-2000°C

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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

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b6 – 12 kg/cm2 and 250 – 350°C

✓


c12 – 20 kg/cm2 and 350 – 450°C

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d20 – 30 kg/cm2 and 450 – 500°C

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


ahigh heat value

✖


blow heat value

✓


cnet calorific value

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dmiddle heat value

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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

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dcalorific value of fuel

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All heat engines utilize_____________________?


alow heat value of oil

✓


bhigh heat value of oil

✖


cnet claorific value of oil

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dcalorific value of fuel

✖


View Answer low heat value of oil

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