Module 16 Piston Engine

It is the position of the piston in a reciprocating engine cylinder when the piston is at the bottom of its stroke and the wrist pin, crankpin and the centre of the crankshaft are all aligned.

• Top Dead Center

• Bottom Dead Center

• Stroke

The actual amount of power delivered to the propeller shaft is called ___________ .

• Combustion Power

• Brake Horsepower

• Linear Motion

The number of crankshaft degrees that the intake valve opens before the piston reaches top dead centre is called ____________?

• Valve Lag

• Valve Overlap

• Valve Lead

Four-stroke diesel engine operating cycle is similar to the Otto cycle, except that the diesel engines use the compression-ignition principle and has ignition system components.

• True

• False

One of the strokes that begins as the piston moves past BDC and begins its upward stroke.

• Intake

• Power

• Compression

The number of pounds of fuel used to produce one horsepower, either indicated or brake is known as ___________?

• Specific Fuel Consumption

• Specific Gravity

• Fuel Burn Rates

Usually, back-firing occurs in carburetted engines that are running rich where the air fuel mixture has insufficient fuel.

• True

• False

All certificated aircraft engines have dual ignition, which means that there are two independent ignition systems, firing two spark plugs in each cylinder.

• True

• False

__________ is defined as a normal combustion process starting before the ignition spark is initiated.

• Combustion

• Preignition

• Detonation

The factor/s that affect the engine power are:

• Fuel burn rates, lean mixture, specific gravity

• Lean mixture, fuel burn rates, rich mixture

• Rich mixture, lean mixture, fuel density