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


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


dmay start and end anywhere



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


afeeding more fuel


bincreasing flywheel size


cheating incoming air


dsupercharging


View Answer supercharging

Which of the following is not an interns combustion engine___________________?


a2-stroke petrol engine


b4-stroke petrol engine


cdiesel engine


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


View Answer loss

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


a0.15 kg


b0.2 kg


c0.25 kg


d0.3 kg


View Answer 0.2 kg

Compression loss in I.C engines occurs due to_________________?


aleaking piston rings


buse of thick head gasket


cclogged air-inlet slots


dall of the above


View Answer all of the above

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


a80°C


b120°C


c180°C


d240°C


View Answer 180°C

Combustion in compression ignition engines is____________________?


ahomogeneous


bheterogeneous


cboth A. and B.


dlaminar


View Answer heterogeneous

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


aincrease


bdecrease


cbe independent


dmay increase or decrease depending on other factors


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%


b4%


c8%


d14%


View Answer 14%

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