Piston Engines Flashcards
You are flying a multi engine propeller aircraft. During the cruise, the critical engine fails. Which configuration creates the most stress on the rudder
Aft CG, skid toward the critical engine
A piston engines compression ratio is the ratio of…
The cylinder volume with the piston at bottom dead centre to the cylinder volume at top dead centre
When excessively leaning the mixture of a piston engine for a better fuel economy, but still on the rich side of the peak EGT, what engine parameters may exceed their normal operating range ?
Cylinder head and exhaust gas temperature
Which of the following statements is correct regarding aircraft engine turbochargers ?
A) The waste-gate is situated in the inlet manifold
B) when the waste gate is fully open the turbocharger is running at full speed.
C) the waste gate actuator is controlled by the waste gate
D) the waste gate diverts exhaust gas to drive the turbine
D) the waste gate diverts exhaust gas to drive the turbine
If detonation occurs in a normally aspirated piston engine during climb- out, the normal corrective action is to…. ?
Retard the throttle
Apart from flight into known icing conditions, the intake system of a diesel engine….
Is never heated because a diesel engine is a injection engine
Dual ignition for a piston engine provides a factor of reliability and…. ?
Improves combustion efficiency
The power output of a diesel engine without a turbo charger is regulated by…?
Fuel flow only
When changing power on piston engines equipped with a constant speed propeller, engine over boost is avoided by…?
Increasing the RPM before increasing the manifold pressure
Consider a variable pitch propeller operating in a low RPM/ High pitch condition. When feather is selected, the
Condition lever ( pitch control) is moved to the feather position and the blades move from high pitch directly to the feather position
The part of a piston engine that transforms reciprocating movement into rotary motion is called the ?
Crankshaft
What is correct with regards to ice accretion in piston engine induction systems ?
Ice accretion affects both fuel injection systems and engines equipped with carburettors
If the ground wire between the magnetos and the ignition switch of a piston engine becomes disconnected the most noticeable result will be that….
The engine cannot be shut down by turning the ignition switch to the OFF position
A piston engine may use a fuel or a different grade than the recommended…?
Provided that the grade is higher
When applying precautionary carburettor heating on a reciprocating engine with a fixed pitch propeller ?
The mixture becomes richer
Consider a variable pitch propeller operating in a high RPM/ low pitch condition. To select reverse thrust, the….?
Power lever is moved to the reverse position and the blades move from low pitch directly to reverse pitch
Cooling air for reciprocating engine is brained by means of…?
Ram air
The purpose of a distributor in an ignition system of a piston engine is to distribute….?
Secondary current to the speaking plugs
The turbocharger waste gate is located in (1)……… and the maximum compressor RPM is achieved when the valve is (2)……..?
(1) turbine
(2) closed
Consider a pistol engine aircraft with a constant speed propeller. Upon reaching cruising altitude when less power is required, engine power is ?
Reduced by lowering the manifold pressure and increasing the blade angle, to decrease RPM
Both gas turbines and piston engines use a cycle made up induction, compression, combustion and exhaust phases. Which of the following statement about a piston engine are correct ?
1) the process in a piston engine is continuous
2) theoretically the combustion occurs at constant volume
1) incorrect
2) correct
The air in a piston engine turbocharger enters the centrifugal compressor at ?
The eye of the impeller and leaves it almost at a tangent to the periphery
Vapour lock is….
A blockage in a fuel feed line caused by a vapour bubble
The operating principle of a float-type carburettors is based on the
Difference in air pressure at the Venturi throat and the air inlet