POWERPLANT PISTON 1

Regarding a normally aspirated piston engine, which of the following statements is correct?

• Power output depends, amongst other things, on the mass of the mixture entering the cylinder.

• Power available will increase with altitude.

• High atmospheric humidity increases power.

• Power available will increase with density altitude.

Refer to figure.

On the diagram showing the power output of a piston engine as a function of mixture ratio, theoretical best economy is shown at...

• 5

• 2

• 3

• 4

The formula to calculate the total displacement of a multi-cylinder piston engine is...

• piston area x piston stroke.

• cylinder length x cylinder diameter.

• piston area x piston stroke x number of cylinders.

• cylinder volume x number of cylinders.

If the manifold pressure gauge of a piston engine shows an increase shortly after carburettor heat is turned on, it indicates that...

• excessive heat is being used.

• ice was forming in carburettor.

• the mixture was too lean.

• the cylinder walls are overheating.

Which statement(s) is/are true?

I. Fuel injections of the engines can not freeze

II. Carburetor freezing often occurs at 5°C to 20°C and at higher temperatures

• I is incorrect, II is correct.

• I is correct, Il is incorrect.

• I is correct, II is correct.

• I is incorrect, II is incorrect.

The oil is stored underneath the engine, with NO external reservoir and a higher oil capacity. Which type of oil system is being described?

• Wet sump.

• Dry sump.

• Neither system is being described.

• Both systems may be being described.

The main reason for opening the cowl flaps is to control the...

• oil temperature

• C.H.T. (cylinder head temperature)

• cabin temperature

• E.G.T (exhaust gas temperature)

An impulse magneto coupling in a piston engine...

• advances ignition timing and gives a hotter spark at starting.

• gives an automatic spark increase during high-speed operation.

• reduces magneto speed during engine warm-up.

• retards the spark during engine starting.