INTERNAL COMBUSTION ENGINES QUIZ

Exhaust valve opens at 35° before bottom dead center and closes at 20° after top dead center

Exhaust valve opens at bottom dead center and closes at top dead center

Exhaust valve opens just after bottom dead center and closes just before top dead center

May open and close anywhere

Turbulence

Pre-ignition

Supercharging

Scavenging

Normal heptane and iso-octane

Iso-octane and alpha-methyl naphthalene

Iso-octane and normal hexane

Normal octane and aniline

All of these

Use of thick head gasket

Clogged air inlet slots

Leaking piston rings

Oil sludge in the engine crank case

Detonation

Piston ring and cylinder wear

Formation of hard coating on piston skirts

More

Less

Same

None of these

Black smoke will be produced

Low power will be produced

Higher knocking will occur

Efficiency will be low

May start and end anywhere

Starts at 40° after bottom dead center and ends at 10° before top dead center

Starts at top dead center and ends at 40° before bottom dead center

Starts at 40° before top dead center and ends at 40° after top dead center

Directly proportional to its distance from the centre

Inversely proportional to its distance from the centre

Directly proportional to its (distance)2 from the centre

Inversely proportional to its (distance)2 from the centre

Cetane number 65

Octane number 35

Octane number 65

Cetane number 35