Vayudoot Aviation

1.
During climb with constant throttle and RPM lever setting (mixture being constant) the

RPM decreases

Manifold Air Pressure (MAP) decreases.

RPM increases

Manifold Air Pressure (MAP) increases

2.
On four-stroke piston engines, the theoretical valve and ignition settings are readjusted in order to increase the

overall efficiency

compression ratio

engine r.p.m.

piston displacement

3.
Max. Exhaust Gas Temperature is theoretically associated with

Full rich setting.

Mass ratio of 1/15.

Cruising mixture setting.

Mixture ratio very close to idle cut-out

4.
The operating principle of float-type carburettors is based on the

measurement of the fuel flow into the induction system

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

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

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

5.
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

take-off power.

maximum power

critical power

rated power

6.
If the ground wire between the magneto and the ignition switch becomes disconnected, the most noticeable result will be that the engine

cannot be shut down by turning the switch to the OFF position

cannot be started with the switch in the ON position

will not operate at the right magneto

will not operate at the left magneto

7.
Fixed-pitch propellers are usually designed for maximum efficiency at

idling

cruising speed

take-off

full throttle

8.
In addition to the fire hazard introduced, excessive priming should be avoided because

it drains the carburettor float chamber

it washes the lubricant of cylinder walls

it fouls the spark plugs

the gasoline dilutes the oil and necessitates changing oil

9.
For a given type of oil, the oil viscosity depends on the

oil temperature

quantity of oil.

oil pressure.

outside pressure.

10.
To adjust the mixture ratio of a piston engine when altitude increases, means to

increase the amount of fuel in the mixture to compensate for the decreasing air pressure and density.

decrease the amount of fuel in the mixture in order to compensate for the increasing air density.

decrease the fuel flow in order to compensate for the decreasing air density.

increase the mixture ratio.

11.
Low oil pressure is sometimes the result of a

too small scavenger pump.

worn oil pump

too large oil pump

restricted oil passage

12.
When changing power on engines equipped with constant-speed propeller, engine overload is avoided by

increasing the manifold pressure before increasing the RPM.

reducing the RPM before reducing the manifold pressure.

increasing the RPM before increasing the manifold pressur

adjusting Fuel Flow before the manifold pressure

13.
In modern aircraft, a pilot can actuate the feather system by

pushing the power lever forward.

pushing the RPM lever forward.

pulling the power levers backwards.

pulling the RPM lever backwards.

14.
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 high RPM.

high manifold pressure and high RPM.

low manifold pressure and low RPM

high manifold pressure and low RPM.

15.
The reading on the oil pressure gauge is the

pressure of the oil on the outlet side of the pressure pump.

pressure of the oil on the inlet side of the pressure pump.

difference between the pressure pump pressure and the scavenge pump pressure

pressure in the oil tank reservoir

16.
On a a normally aspirated engine (non turbo-charged), the manifold pressure gauge always indicates

a lower value than atmospheric pressure when the engine is running

a greater value than atmospheric pressure when the engine is running

a value equal to the QFE when the engine is at full power on the ground.

zero on the ground when the engine is stopped.

17.
In most cases aeroplane piston engines are short stroke engines. This permits a

better piston cooling

cheaper construction

lighter construction.

lower fuel consumption

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

a hybrid compressor.

an axial compressor.

a piston compressor

a radial compressor

19.
One of the advantages of a turbosupercharger is that

there is no danger of knocking

it has a better propulsive efficiency.

there is no torsion at the crankshaft

it uses the exhaust gas energy which normally is lost.

20.
On a normally aspirated aero-engine fitted with a fixed pitch propeller

in a descent at a fixed throttle setting manifold pressure will always remain constant

manifold pressure decreases as the aircraft climbs at a fixed throttle setting.

in level flight, manifold pressure will remain constant when the rpm is increased by opening the throttle.

the propeller setting is constant at all indicated airspeeds

21.
The 'constant speed propeller' has

only above and below the design point a better efficiency than the fixed propeller with the same design speed.

only at the design speed a better efficiency than the fixed propeller

in general a worse efficiency than the fixed propeller

its best efficiency during climb.

22.
A piston engine compression ratio is the ratio of the

swept volume to the clearance volume

clearance volume to the swept volume

total volume to the clearance volume.

total volume to the swept volume

23.
A turbocharger consists of a

compressor and turbine on individual shafts

turbine driving a compressor via a reduction gear

compressor and turbine mounted on a common shaft

compressor driving a turbine via a reduction gear

24.
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 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.

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

25.
The main purpose of the mixture control is to

adjust the fuel flow to obtain the proper fuel/air ratio

increase the oxygen supplied to the engine

decrease oxygen supplied to the engine

decrease the air supplied to the engine

26.
The air in a piston engine turbo-supercharger centrifugal compressor

enters at the periphery and leaves via the eye of the impeller

enters the eye of the impeller and leaves at a tangent to the periphery.

enters via the diffuser and is fed to the impeller at the optimum angle of attack

enters at a tangent to the rotor and leaves via the stator

27.
When in flight, a piston engine is stopped and the propeller blade pitch angle is near 90°, the propeller is said to be...

feathered.

at zero drag.

windmilling.

transparent.

28.
The torque of an aeroplane engine can be measured at the

gear box which is located between the engine and the propeller

accessory gear box

camshaft.

propeller blades

29.
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

30.
Consider the variable-pitch propeller of a turbo-prop.During deceleration

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

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

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

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

31.
The power of a piston engine which will be measured by using a friction brake is

Friction horse power.

Heat loss power

Indicated horse power.

Brake horse power

32.
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

blade is relatively high.

blade is relatively small

airfoil section is negative.

blades reduces to zero.

33.
The feathering pump of a hydraulic variable-pitch propeller

controls the propeller, if the speed governor fails.

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

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

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

34.
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

35.
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

36.
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

a diffuser

a power jet

a mixture control

an accelerator pump

37.
The useful work area in an ideal Otto engine indicator diagram is enclosed by the following gas state change lines

2 adiabatic and 2 isobaric lines

2 adiabatic and 2 isochoric lines.

2 adiabatic and 1 isothermic lines

2 adiabatic, 1 isochoric and 1 isobaric lines.

38.
An impulse coupling used on a magneto for a piston engine is for

absorbing starting loads

advancing ignition timing

providing a retarded spark for engine starting

quick removal and installation

39.
When applying carburettor heating

no change occurs in the mixture ratio.

the mixture becomes leaner.

the mixture becomes richer.

decrease in RPM results from the lean mixture

40.
A fuel strainer when fitted to a carburettor will be positioned

between the metering jet and the discharge nozzle.

upstream of the needle valve.

downstream of th discharge nozzle

between the needle valve and the metering jet.

41.
The ignition occurs in each cylinder of an four-stroke engine (TDC = Top Dead Center)

before TDC at each crankshaft revolution.

before TDC at each second crankshaft revolution.

behind TDC at each second crankshaft revolution

behind TDC at each crankshaft revolution

42.
In twin-engine aeroplanes with right turning propellers

the left engine is the critical motor

the right engine is the critical motor.

the 'minimum control speed' is determined by the failure of the right engine.

the left engine produces a higher yaw moment if the right engine fails than vice versa.

43.
A rich mixture setting has to be used during climb segments. This results in a

slight loss of power.

lower cylinder head temperature

higher torque.

higher efficiency.

44.
When leaning the mixture for the most economic cruise fuel flow, excessive leaning will cause

low cylinder head and exhaust gas temperature

high manifold pressure

high engine rpm

high cylinder head and exhaust gas temperature

45.
Prolonged running at low rpm may have an adverse effect on the efficiency of the

sparking plugs

oil pump

carburettor.

fuel filter.

46.
The crank assembly consists of

Crankcase, crankshaft, connecting rods and pistons

crankshaft, camshaft, valves, valve springs and push rods

propeller, crankshaft, pistons and connecting rods

crankshaft, connecting rods and pistons

47.
The pitch angle of a propeller is the angle between the

propeller plane of rotation and the relative airflow.

propeller reference chord line and the extremity of the propeller.

propeller reference chord line and the relative airflow.

reference chord line and the propeller plane of rotation.

48.
In general, in twin-engine aeroplanes with 'constant speed propeller'

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

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

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

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

49.
A pilot normally uses the propeller autofeather system during

Take-off and landing

Cruise.

Take-off.

Landing.

50.
The conditions which can cause knocking are

Low manifold pressure and high revolutions per minute.

High manifold pressure and high revolutions per minute

High manifold pressure and low revolutions per minute.

Low manifold pressure and high fuel flow.

Question Bank

Questions for INDIGO PISTON (836-954)

During climb with constant throttle and RPM lever setting (mixture being constant) the

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

Max. Exhaust Gas Temperature is theoretically associated with

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

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

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

Fixed-pitch propellers are usually designed for maximum efficiency at

In addition to the fire hazard introduced, excessive priming should be avoided because

For a given type of oil, the oil viscosity depends on the

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

Low oil pressure is sometimes the result of a

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

In modern aircraft, a pilot can actuate the feather system by

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 ...

The reading on the oil pressure gauge is the

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

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

The kind of compressor normally used as a supercharger is

One of the advantages of a turbosupercharger is that

On a normally aspirated aero-engine fitted with a fixed pitch propeller

The 'constant speed propeller' has

A piston engine compression ratio is the ratio of the

A turbocharger consists of a

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

The main purpose of the mixture control is to

The air in a piston engine turbo-supercharger centrifugal compressor

When in flight, a piston engine is stopped and the propeller blade pitch angle is near 90°, the propeller is said to be...

The torque of an aeroplane engine can be measured at the

Vapour lock is

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

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

The feathering pump of a hydraulic variable-pitch propeller

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

Specific fuel consumption is defined as the

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

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

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

When applying carburettor heating

A fuel strainer when fitted to a carburettor will be positioned

The ignition occurs in each cylinder of an four-stroke engine (TDC = Top Dead Center)

In twin-engine aeroplanes with right turning propellers

A rich mixture setting has to be used during climb segments. This results in a

When leaning the mixture for the most economic cruise fuel flow, excessive leaning will cause

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

The crank assembly consists of

The pitch angle of a propeller is the angle between the

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

A pilot normally uses the propeller autofeather system during

The conditions which can cause knocking are