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Questions for INDIGO PISTON (836-954)

Answer the following questions

1.

The power output of a normally aspirated piston engine increases with increasing altitude at constant Manifold Air Pressure (MAP) and RPM because of the

2.

Spark plug fouling is more likely to happen if

3.

Vapour lock is

4.

The purpose of an ignition switch is to

5.

An aircraft magneto is switched off by

6.

The kind of compressor normally used as a supercharger is

7.

An impulse coupling used on a magneto for a piston engine is for

8.

n a piston engine, turbocharger boost pressure may be monitored by

9.

Ignition systems of piston engines are

10.

An excessively rich mixture can be detected by

11.

A piston engine compression ratio is the ratio of the

12.

""Vapor lock"" is the phenomenon by which

13.

Fixed-pitch propellers are usually designed for maximum efficiency at

14.

The octane rating of a fuel characterises the

15.

The part of a piston engine that transforms reciprocating movement into rotary motion is termed the

16.

The purpose of the venturi in a carburettor is to

17.

The conditions which can cause knocking are

18.

To ensure that the fuel flow is kept directly proportional to the volume of air flowing through the choke, thus preventing the main jet supplying excessive fuel as engine speed is increased, a carburettor is fitted with

19.

(For this question use appendix )On the attached diagram showing the power output of a piston engine as a function of mixture richness, best economy is at the point marked

20.

The primary purpose of a supercharger is to

21.

The air in a piston engine turbo-supercharger centrifugal compressor

22.

When applying carburettor heating

23.

Max. Exhaust Gas Temperature is theoretically associated with

24.

The 'slipstream effect' of a propeller is most prominent at

25.

The useful work area in an ideal Otto engine indicator diagram is enclosed by the following gas state change lines

26.

The 'constant speed propeller' has

27.

Low oil pressure is sometimes the result of a

28.

What can be the consequence during a descent with a fully open throttle if the waste gate is seized ?

29.

Consider the variable-pitch propeller of a turbo-prop.During deceleration

30.

In case of engine failure during flight the blades of the constant speed propeller in a single engine aeroplane, not fitted with feathering system

31.

For internal cooling,reciprocating engines are especially dependent on

32.

The positions of the intake and exhaust valve at the end of the power stroke are

33.

When the pilot moves the mixture lever of a piston engine towards a lean position the

34.

For a piston engine, the ideal fuel/air mixture corresponding to a richness of 1 is obtained for a weight ratio of

35.

The maximum horsepower output which can be obtained from an engine when it is operated at specified rpm and manifold pressure conditons established as safe for continuous operation is termed

36.

Prolonged running at low rpm may have an adverse effect on the efficiency of the

37.

Which of the following factors would be likely to increase the possibility of detonation occurring within a piston engine ?

38.

A piston engine may use a fuel of a different grade than the recommended

39.

On four-stroke piston engines, the theoretical valve and ignition settings are readjusted in order to increase the

40.

The working cycle of a four-stroke engine is

41.

In most cases aeroplane piston engines are short stroke engines. This permits a

42.

The crank assembly consists of

43.

In which sections of the carburettor would icing most likely occur?

44.

On a a normally aspirated engine (non turbo-charged), the manifold pressure gauge always indicates

45.

Spark timing is related to engine speed in the way that the

46.

If the ground wire between the magneto and the ignition switch becomes disconnected, the most noticeable result will be that the engine

47.

When TAS increases, the pitch angle of a constant speed propeller (RPM and MAP levers are not moved)

48.

2 adiabatic, 1 isochoric and 1 isobaric lines

49.

The octane rating of a fuel and compression ratio of a piston engine have which of the following relations?

50.

To adjust the mixture ratio of a piston engine when altitude increases, means to