PowerPlant

A piston engine compression ratio is the ratio of the:

• swept volume to the clearance volume.

• total volume to the swept volume.

• total volume to the clearance volume.

• clearance volume to the swept volume.

The thermal efficiency of a piston engine is approximately:

• 50%

• 90%

• 30%

• 75%

What is the total volume in the cylinder of a four stroke engine?

• Swept volume minus clearance volume.

• A value equal to the cubic capacity.

• Swept volume plus clearance volume.

• Volume between TDC and BDC.

Specific fuel consumption is defined as the:

• designed fuel consumption for a given RPM.

• quantity of fuel required to run the engine for one minute at maximum operating conditions.

• mass of fuel required to produce unit power for unit time.

• maximum fuel consumption of the aircraft.

In a convergent duct:

• the pressure and velocity increase, the temperature decreases

• the pressure and temperature decrease, the velocity increases

• the temperature and velocity increase, the pressure decreases

• the pressure and velocity remain constant, the temperature decreases

The term 'swept volume' defines the volume :

• displaced by the piston during a single stroke.

• above the piston when it is at the top dead centre.

• above the piston when it is at the bottom dead centre.

• displaced by the piston during a full cycle.

The compression relation for piston engines refers to :

• volumes.

• areas.

• areas and volumes.

• pressures.

The power output of a piston engine is directly proportional to:

• torque and RPM.

• work and velocity.

• force and distance.

• exhaust back pressure and RPM.

The correct working cycle of a four-stroke engine is:

• exhaust, power, induction, compression

• compression, power, exhaust, induction

• induction, power, compression, exhaust

• power, exhaust, compression, induction

The degrees of rotation to complete a full cycle on a reciprocating engine will be:

• 180

• 360

• 720

• 80