INTERNAL COMBUSTION ENGINES QUIZ

Fuel injection starts at 10° before top dead center and ends at 20° after top dead center

May start and end anywhere

Fuel injection starts at just before top dead center and ends just after top dead center

Fuel injection starts at top dead center and ends at 20° after top dead center

None of these

Same

Lower

Higher

Indicated by 90% distillation temperature, i.e., when 90% of sample oil has distilled off

Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame

Temperature at which it solidifies or congeals

It catches fire without external aid

More

Variable

Same

Less

Scavenging

Feeding more fuel

Supercharging

Heating incoming air

Piston ring and cylinder wear

Formation of hard coating on piston skirts

Oil sludge in the engine crank case

Detonation

Indicated thermal efficiency

Mechanical efficiency

Overall efficiency

Volumetric efficiency

Is lighter

Consumes less lubricating oil

All of these

Requires smaller foundation

Triangular

Trapezoidal

Rectangular

Circular

Low

Very low

High

Very high