INDIGO PISTON(836-954) - Dgca question bank for pilots

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

feathered.

windmilling.

at zero drag.

transparent.

#2. 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 …

high manifold pressure and high RPM.

high manifold pressure and low RPM.

low manifold pressure and low RPM

low manifold pressure and high RPM.

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

increase or decrease, depending on the engine type

decrease

increase

remain the same

#4. When applying carburettor heating :

decrease in RPM results from the lean mixture

the mixture becomes leaner.

the mixture becomes richer.

no change occurs in the mixture ratio.

#5. When the pilot moves the mixture lever of a piston engine towards a lean position the :

volume of air entering the carburettor is increased

volume of air entering the carburettor is reduced.

amount of fuel entering the combustion chamber is increased

amount of fuel entering the combustion chamber is reduced.

#6. When altitude increases without adjustment of the mixture ratio, the piston engine performance is affected because of a :

decrease of air density for a smaller quantity of fuel.

constant air density for a bigger quantity of fuel.

increase of air density for smaller quantity of fuel.

decrease of air density for a constant quantity of fuel.

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

reducing the RPM before reducing the manifold pressure.

increasing the RPM before increasing the manifold pressur

increasing the manifold pressure before increasing the RPM.

adjusting Fuel Flow before the manifold pressure

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

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

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

increase the mixture ratio.

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

#9. 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

#10. With which instrument(s) do you monitor the power output of an aeroplane fitted with a fixed pitch propeller?

RPM and Fuel Flow indicator.

RPM and EGT indicator.

RPM indicator

RPM and MAP indicator.

#11. An EGT (Exhaust Gas Temperature) indicator for a piston engine is used to :

control the cylinder head temperature.

control the fuel temperature.

control the carburator inlet air flow

assist the pilot to settle correct mixture.

#12. During climb with constant throttle and RPM lever setting (mixture being constant) the :

Manifold Air Pressure (MAP) decreases.

RPM increases

Manifold Air Pressure (MAP) increases

RPM decreases

#13. 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.

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

the use of a fuel with a high octane rating as compared to the use of one with a low octane rating

using an engine with a low compression ratio

slightly retarding the ignition timing

using too lean a fuel/air mixture ratio

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

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.

a lower value than atmospheric pressure when the engine is running

zero on the ground when the engine is stopped.

#16. Spark plug fouling is more likely to happen if :

power is increased too abruptly

the engine runs at the authorized maximum continuous power for too long

the aircraft descends without a mixture adjustment.

the aircraft climbs without mixture adjustment.

#17. Pre-ignition refers to the condition that may arise when :

the sparking plug ignites the mixture too early

a rich mixture is ignited by the sparking plugs.

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.

#18. With a piston engine, when detonation is recognised, you:

Increase manifold pressure and enrich the mixture

Reduce manifold pressure and enrich the mixture

Reduce manifold pressure and lean the mixture

Increase manifold pressure and lean the mixture

Finish