Aircraf General Knowledge
STRUCTURE
The bending of an aeroplane’s wing spar in flight is the product of opposing forces – lift which bends the wing .....(a)...... and weight which bends the wing .....(b)......
Select the answer which correctly completes this statement.
(a) (b)
Select the answer which correctly completes this statement.
(a) (b)
P) upwards downwards
The purpose of stringers, used in fuselage construction, is to:
P) assist the skin to absorb longitudinal compressive loads.
When a battery is almost fully discharged there is a tendency for the:
P) voltage to decrease even under light loads.
ELECTRICAL
The connection in series of two 12 volt/40 amp hours batteries, will create a unit with the following characteristics;
P) 24 volt/40 amp hours
The rating of electrical fuses is expressed in:
P) amperes.
What provides the main source of electrical power to the bus bar, when the aircraft engine is running?
P) Alternator / Generator.
The connection in parallel of two 12 volt/40 amp hours batteries, will create a unit with the following characteristics;
P) 12 volt/80 amp hours
If during flight overvoltage condition exists due to voltage regulator failure, the best course of action is:
P) Alternator switch should be turned off
An ammeter reading as shown in the diagram would indicate (diagram shows ammeter needle to the left of zero):
P) battery discharging to the bus bar.
CARBURATOR / FUEL INJECTION
When hot air is selected to the carburator air intake, why is the engine power reduced?
P) Because the density of the mixture is decreased.
The first indication of carburator icing, in aeroplanes equipped with constant speed propellers, during cruise would most likely be a:
P) decrease in manifold pressure.
The mixture control of the carburettor:
P) varies the fuel flow to the main jet.
The application of carburator heating reduces the:
P) density of air entering the carburettor, thus enriching the mixture.
Fuel/air ratio is the ratio between the:
P) mass of fuel and mass of air entering the cylinder.
As altitude increases, the mixture ratio of a piston engine should be adjusted to :
P) reduce the fuel flow in order to compensate for the decreasing air density.
IGNITION / MAGNETO
The ignition system of a running piston engine receives electrical energy from:
P) rotating permanent magnets.
Whilst checking the magnetos, no drop is observed from either of them. What does this indicate?
P) The aircraft should not be flown, as the magnetos may be permanently ‘live’.
Under normal running conditions a magneto draws primary current:
P) from a self-contained electro-magnetic induction system.
With an aircraft fitted with a fixed pitch propeller, during flight at normal cruising speed, one magneto fails completely. This will first cause:
P) loss of approximately 100 rpm.
An impulse coupling is installed on a magneto of a piston engine to:
P) provide a stronger spark on top dead centre for engine starting.
PISTON ENGINE
What happens to engine lubricating oil at low temperature?
P) it becomes more viscous.
Excessive pressure in the cylinders of an engine equipped with a constant speed propeller, can be caused by the combination of:
P) high manifold pressure and low RPM.
With which instrument(s) do you monitor the power output of an aeroplane fitted with a fixed pitch propeller?
P) RPM indicator.
How would you identify carbon monoxide (CO) gas as having entered the aircraft cabin?
P) You could not identify CO, as it is colourless and odourless.
The cylinder head and oil temperatures may exceed their normal operating ranges if:
P) a lower octane rating than specified for the engine is used.
In a reciprocating four-stroke engine, the only "driving" stroke is:
P) power.
With which instrument(s) do you monitor the power output of an aeroplane fitted with a constant speed propeller?
P) RPM and MAP indicator.
The relationship between compression ratio of a piston engine and the required fuel octane rating is that the:
P) higher the compression ratio, the higher the octane rating required.
In a piston engine, turbocharger boost pressure may be monitored by:
P) a manifold pressure gauge only.
With which instrument(s) do you monitor the power output of an aeroplane fitted with a fixed pitch propeller?
P) RPM indicator.
In order to get the optimum efficiency of a piston engine, the positions of the intake and exhaust valve just after the power stroke are:
P) intake valve closed and exhaust valve open.
For internal cooling, reciprocating engines are especially dependent on:
P) the circulation of lubricating oil
INSTRUMENTS
With the altimeter set to QNH, it will read altitude:
P) Above Mean Sea Level (AMSL).
If, on descent, the static vent becomes blocked, the altimeter will:
P) over read.
When flying in warm air (warmer than standard atmosphere), indicated altitude is:
P) lower than the true altitude.
With regard to the Vertical Speed Indicator (VSI), what will the instrument read if there is a blockage of the static line?
P) zero.
The difference between Compass North and Magnetic North is called:
P) deviation.
The vacuum gauge in the aircraft reads 5" of mercury. This is measured from:
P) below the ambient air pressure.
What does the ball signify in the Turn Co-ordinator?
P) Slip and skid.
The magnetic heading can be derived from the true heading by means of a:
P) map showing the isogonal lines
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