INTERNAL COMBUSTION ENGINES QUIZ

Volumetric efficiency

Indicated thermal efficiency

Overall efficiency

Mechanical efficiency

4-stroke cycle engines

High efficiency engines

2-stroke cycle engines

Aeroplane engines

Tetra ethyl lead

Napthene

Amyl nitrate

Hexadecane

25 to 30

40 to 55

20 to 25

30 to 40

None of the listed here

Increase

Decrease

Remain same

High thermal efficiency and power output

Low volumetric efficiency

Minimum turbulence

Low compression ratio

A fine fuel spray mixed with air is ignited by the heat of compression which is at a high pressure

The fuel is first evaporated after passing through a carburettor and is mixed with air before ignition

All of these

The fuel supplied to the engine cylinder is mixed with necessary amount of air and the mixture in ignited with the help of a spark plug

Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere

Supplying compressed air to remove combustion products fully

Injecting excess fuel for raising more loads

Providing forced cooling air

0.7

1

0.5

0.25

May open and close anywhere

Opens at 15° before top dead center and closes at 20° after top dead center

Opens at top dead center and closes at bottom dead center

Opens at 15° after top dead center and closes at 20° before bottom dead center