Vayudoot Aviation

1.
The mixture control for a carburettor achieves its control by

varying the air supply to the main discharge tube.

varying the fuel supply to the main discharge tube.

moving the butterfly valve through a separate linkage to the main throttle control

altering the depression on the main discharge tube.

2.
For piston engines, mixture ratio is the ratio between the

volume of fuel and volume of air entering the cylinder

mass of fuel and mass of air entering the cylinder.

volume of fuel and volume of air entering the carburettor.

mass of fuel and volume of air entering the carburettor.

3.
A pilot normally uses the propeller autofeather system during

Cruise.

Landing.

Take-off and landing

Take-off.

4.
The main advantage of a constant speed propeller as compared to a fixed pitch propeller is a

higher efficiency in cruising range.

lower propeller blade stress.

higher efficiency in all operating ranges

constant efficiency in all operating ranges.

5.
The positions of the intake and exhaust valve at the end of the power stroke are

both valves closed.

intake valve closed and exhaust valve open.

both valves open.

exhaust valve closed and intake valve open.

6.
The power output of a piston engine can be calculated by

Force times distance.

Work times velocity

Pressure times arm.

Torque times RPM.

7.
A turbocharger system is normally driven by

an electric motor

an hydraulic motor.

an electrically activated hydraulically powered clutch

the exhaust system

8.
With a piston engine, when detonation is recognised, you

Reduce manifold pressure and enrich the mixture

Increase manifold pressure and enrich the mixture

Increase manifold pressure and lean the mixture

Reduce manifold pressure and lean the mixture

9.
In case of engine failure during flight the blades of the constant speed propeller in a single engine aeroplane, not fitted with feathering system

move in low pitch position by oil pressure created by the windmilling propeller.

move in the lowest pitch position by the centrifugal force.

move in the highest pitch position by the aerodynamical force.

move in a certain pitch position depending on windmilling RPM.

10.
In an engine equipped with a float-type carburettor, the low temperature that causes carburettor ice is normally the result of

low volatility of aviation fuel

vaporization of fuel and expansion of the air in the carburettor

freezing temperature of the air entering the carburettor

compression of air at the carburettor venturi

11.
On modern carburettors, the variations of mixture ratios are obtained by the adjustment of

fuel flow and air flow.

fuel flow, air flow and temperature

fuel flow.

air flow

12.
Vapour lock is

the formation of water vapour in a fuel system

vaporizing of fuel prior to reaching the carburettor

vaporizing of fuel in the carburettor

the inability of a fuel to vaporize in the carburettor

13.
Which of the following qualitative statements about a fixed propeller optimized for cruise condition, is true for the take-off case? The angle of attack of the propeller

airfoil section is negative.

blades reduces to zero.

blade is relatively small

blade is relatively high.

14.
From the cruise, with all the parameters correctly set, if the altitude is reduced, to maintain the same mixture the fuel flow should

decrease

increase

increase or decrease, depending on the engine type

remain the same

15.
For take-off, the correct combination of propeller pitch (1), and propeller lever position (2) at brake release is

(1) high (2) aft.

(1) high (2) forward.

(1) low (2) forward.

(1) low (2) aft.

16.
The oil system for a piston engine incorporates an oil cooler that is fitted

after the pressure pump but before the oil passes through the engine

in the return line to the oil tank after the oil has passed through the scavenge pump

between the oil tank and the pressure pump

after the oil has passed through the engine and before it enters the sump

17.
The power of a piston engine decreases during climb with a constant power lever setting, because of the decreasing

temperature.

humidity.

air density

engine temperature

18.
The kind of compressor normally used as a supercharger is

an axial compressor.

a radial compressor

a piston compressor

a hybrid compressor.

19.
The primary purpose of a supercharger is to

provide leaner mixtures at altitudes below 5000 ft

provide a richer mixture at high altitudes

maintain power at altitude

increase quantity of fuel at metering jet

20.
Fuel stored in aircraft tanks will accumulate moisture. The most practical way to minimize this when an aircraft is used every day or so is to

use only high octane gasoline

keep tank vents plugged and filler cap tight

drain tanks at end of each day's flight

keep tanks topped off when the aircraft is not in use

21.
The pitch angle of a constant-speed propeller

is independent of the true air speed

decreases with increasing true air speed.

only varies with engine RPM.

increases with increasing true air speed

22.
The working cycle of a four-stroke engine is

induction, power, compression, exhaust.

induction, compression, power, exhaust.

induction, compression, expansion, power

compression induction, power, exhaust.

23.
A turbocharger consists of a

compressor and turbine on individual shafts

turbine driving a compressor via a reduction gear

compressor driving a turbine via a reduction gear

compressor and turbine mounted on a common shaft

24.
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

maximum power

rated power

critical power

take-off power.

25.
A fuel strainer when fitted to a carburettor will be positioned

downstream of th discharge nozzle

between the needle valve and the metering jet.

upstream of the needle valve.

between the metering jet and the discharge nozzle.

26.
The power of a piston engine which will be measured by using a friction brake is

Brake horse power

Heat loss power

Indicated horse power.

Friction horse power.

27.
In a piston engine if the ratio of air to fuel, by weight, is approximately 9:1, the mixture is said to be

weak

too weak to support combustion

normal

rich

28.
Specific fuel consumption is defined as the

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

designed fuel consumption for a given rpm.

maximum fuel consumption of the aircraft

29.
The purpose of a distributor in an ignition system is to distribute

primary current to the condenser.

secondary current to the condenser.

secondary current to the sparking plugs.

primary current to the sparking plugs.

30.
For a piston engine, the ideal fuel/air mixture corresponding to a richness of 1 is obtained for a weight ratio of

1/15 th

1/10th

1/9 th

1/12th

31.
Consider the variable-pitch propeller of a turbo-prop.During deceleration

when braking, the propeller supplies negative thrust and absorbs engine power.

with propeller windmilling, the thrust is zero and the propeller supplies engine power

at zero power, the propeller thrust is zero and the engine power absorbed is nil

when feathered, the propeller produces thrust and absorbs no engine power.

32.
When the magneto selector switch is set to ""OFF"" position, the piston engine continues to run normally.The most probable cause of this failure is that

On a magneto, a grounding wire is broken.

There is a carbon deposit on the spark plugs electrodes

A wire from the magneto is in contact with a metallic part of the engine.

There are local hot points in the engine (probably due to overheating of the cylinder heads).

33.
Pre-ignition refers to the condition that may arise when

the mixture is ignited by abnormal conditions within the cylinder before the spark occurs at the plug

the mixture is ignited before the piston has reached top dead centre.

a rich mixture is ignited by the sparking plugs.

the sparking plug ignites the mixture too early

34.
The feathering pump of a hydraulic variable-pitch propeller

is intended to control the pitch setting of the propeller during flight in order to obtain a constant speed.

is an electrically driven oil pump, which supplies the propeller with pressure oil, when the engine is inoperative.

is driven by the engine and supplies pressure oil to the propeller in case of engine problems.

controls the propeller, if the speed governor fails.

35.
The octane rating of a fuel and compression ratio of a piston engine have which of the following relations?

the higher the octane rating is, the higher the possible compression ratio is

the higher the octane rating is, the lower the possible compression ratio is.

the lower the octane rating is, the higher the possible compression ratio is

compression ratio is independent of the octane rating.

36.
Ignition systems of piston engines are

dependant on the DC-Generator

dependant on the AC-Generator.

dependant on the battery.

independant from the electrical system of the aircraft.

37.
A piston engine compression ratio is the ratio of the

clearance volume to the swept volume

total volume to the clearance volume.

swept volume to the clearance volume

total volume to the swept volume

38.
The octane rating of a fuel characterises the

the anti-knock capability

fuel volatility

fuel electrical conductivity

quantity of heat generated by its combustion

39.
When changing power on engines equipped with constant-speed propeller, engine overload is avoided by

increasing the RPM before increasing the manifold pressur

reducing the RPM before reducing the manifold pressure.

adjusting Fuel Flow before the manifold pressure

increasing the manifold pressure before increasing the RPM.

40.
In general, in twin-engine aeroplanes with 'constant speed propeller'

the oil pressure turns the propeller blades towards higher pitch angle.

the spring force turns the propeller blades towards smaller pitch angle.

the oil pressure turns the propeller blades towards smaller pitch angle.

the aerodynamic force turns the propeller blades towards higher pitch angle.

41.
When increasing true airspeed with a constant engine RPM, the angle of attack of a fixed pitch propeller

increases.

reduces.

stays constant.

stays constant because it only varies with engine RPM.

42.
Spark timing is related to engine speed in the way that the

faster the engine functions, the further past TDC the spark occurs

faster the engine functions, the more retarded the spark is.

faster the engine functions, the more the spark is advanced

slower the engine functions, the more the spark is advanced

43.
When TAS increases, the pitch angle of a constant speed propeller (RPM and MAP levers are not moved)

first reduces and after a short time increases to its previous value.

reduces.

stays constant

increases.

44.
An aircraft magneto is switched off by

opening the primary circuit

opening the secondary circuit

grounding the secondary circuit.

grounding the primary circuit

45.
The richness of a fuel/air mixture ratio is the

real mixture ratio relative to the theoretical ratio

mass of fuel relative to the volume of air.

volume of fuel relative to the mass of the volume of air.

volume of fuel relative to the volume of air.

46.
When the pilot moves the mixture lever of a piston engine towards a lean position the

volume of air entering the carburettor is increased

amount of fuel entering the combustion chamber is reduced.

amount of fuel entering the combustion chamber is increased

volume of air entering the carburettor is reduced.

47.
The conditions under which you obtain the highest engine power are

warm and dry air at high pressure.

warm and humid air at low pressure.

cold and humid air at high pressure.

cold and dry air at high pressure.

48.
For internal cooling,reciprocating engines are especially dependent on

the circulation of lubricating oil

a lean fuel/air mixture

a properly functioning thermostat

a rich fuel/air mixture

49.
The operating principle of float-type carburettors is based on the

increase in air velocity in the throat of a venturi causing an increase in air pressure

automatic metering of air at the venturi as the aircraft gains altitude

difference in air pressure at the venturi throat and the air inlet

measurement of the fuel flow into the induction system

50.
During a power change on an engine equipped with a constant speed propeller, a wrong combination of manifold pressure and RPM values results in excessive pressures in the cylinders. This is the case when one simultaneously selects a ...

low manifold pressure and low RPM

low manifold pressure and high RPM.

high manifold pressure and low RPM.

high manifold pressure and high RPM.

Question Bank

Questions for INDIGO PISTON (836-954)

The mixture control for a carburettor achieves its control by

For piston engines, mixture ratio is the ratio between the

A pilot normally uses the propeller autofeather system during

The main advantage of a constant speed propeller as compared to a fixed pitch propeller is a

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

The power output of a piston engine can be calculated by

A turbocharger system is normally driven by

With a piston engine, when detonation is recognised, you

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

In an engine equipped with a float-type carburettor, the low temperature that causes carburettor ice is normally the result of

On modern carburettors, the variations of mixture ratios are obtained by the adjustment of

Vapour lock is

Which of the following qualitative statements about a fixed propeller optimized for cruise condition, is true for the take-off case? The angle of attack of the propeller

From the cruise, with all the parameters correctly set, if the altitude is reduced, to maintain the same mixture the fuel flow should

For take-off, the correct combination of propeller pitch (1), and propeller lever position (2) at brake release is

The oil system for a piston engine incorporates an oil cooler that is fitted

The power of a piston engine decreases during climb with a constant power lever setting, because of the decreasing

The kind of compressor normally used as a supercharger is

The primary purpose of a supercharger is to

Fuel stored in aircraft tanks will accumulate moisture. The most practical way to minimize this when an aircraft is used every day or so is to

The pitch angle of a constant-speed propeller

The working cycle of a four-stroke engine is

A turbocharger consists of a

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

A fuel strainer when fitted to a carburettor will be positioned

The power of a piston engine which will be measured by using a friction brake is

In a piston engine if the ratio of air to fuel, by weight, is approximately 9:1, the mixture is said to be

Specific fuel consumption is defined as the

The purpose of a distributor in an ignition system is to distribute

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

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

When the magneto selector switch is set to ""OFF"" position, the piston engine continues to run normally.The most probable cause of this failure is that

Pre-ignition refers to the condition that may arise when

The feathering pump of a hydraulic variable-pitch propeller

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

Ignition systems of piston engines are

A piston engine compression ratio is the ratio of the

The octane rating of a fuel characterises the

When changing power on engines equipped with constant-speed propeller, engine overload is avoided by

In general, in twin-engine aeroplanes with 'constant speed propeller'

When increasing true airspeed with a constant engine RPM, the angle of attack of a fixed pitch propeller

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

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

An aircraft magneto is switched off by

The richness of a fuel/air mixture ratio is the

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

The conditions under which you obtain the highest engine power are

For internal cooling,reciprocating engines are especially dependent on

The operating principle of float-type carburettors is based on the

During a power change on an engine equipped with a constant speed propeller, a wrong combination of manifold pressure and RPM values results in excessive pressures in the cylinders. This is the case when one simultaneously selects a ...