Mechanical Engineering MCQs

Page No. 79

In a typical medium speed 4-stroke cycle diesel engine________________?


acompression starts at 35° after bottom dead center and ends at top dead center

✓


bcompression starts at bottom dead center and ends at top dead center

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ccompression starts at 10° before bottom dead center and, ends just before top dead center

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dmay start and end anywhere

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The output of a diesel engine can be increased without increasing the engine revolution or size in following way_________________?


afeeding more fuel

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bincreasing flywheel size

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cheating incoming air

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dsupercharging

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View Answer supercharging

Which of the following is not an interns combustion engine___________________?


a2-stroke petrol engine

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b4-stroke petrol engine

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cdiesel engine

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dsteam turbine

✓


View Answer steam turbine

The air requirement of a petrol engine during starting compared to theoretical airequired for complete combustion is___________________?


amore

✖


bloss

✓


csame

✖


dmay be more or less depending on engine capacity

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View Answer loss

The specific fuel consumption per BHP hour for diesel engine is approximately___________________?


a0.15 kg

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b0.2 kg

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c0.25 kg

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d0.3 kg

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View Answer 0.2 kg

Compression loss in I.C engines occurs due to_________________?


aleaking piston rings

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buse of thick head gasket

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cclogged air-inlet slots

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dall of the above

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View Answer all of the above

The temperature of interior surface of cylinder wall in normal operation is not allowed to exceed____________________?


a80°C

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b120°C

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c180°C

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d240°C

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View Answer 180°C

Combustion in compression ignition engines is____________________?


ahomogeneous

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bheterogeneous

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cboth A. and B.

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dlaminar

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View Answer heterogeneous

The thermal efficiecny of a diesel cycle having fixed compression ratio, with increase in cut-off ratio will___________________?


aincrease

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bdecrease

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cbe independent

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dmay increase or decrease depending on other factors

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View Answer decrease

If the compression ratio of an engine working on Otto cycle is increased from 5 to 7, the %age increase in efficiency will be________________?


a2%

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b4%

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c8%

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d14%

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View Answer 14%

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