About piston engines and gas turbines,

1 A piston engine is a volumetric machine

2 A piston engine can develop more specific power than a turbine

3 A gas turbine is a flow machine

Which of the statements below is true...

1 thanks to the design of the diffuser, the power of a turbojet does not depend so strongly on the altitude as a piston engine.

2 the power of the turbojet is basically controlled through the gas throttle

3 during take-off, almost all the power provided by the turbojet is used

An aircraft is at the runway is preparing to take off. We can assure that:

Which of the following statements is true?

1 thrust reverse are used at the landing to stop the plane

2 the vectorized drive helps increase the manoeuvrability of an aircraft

3 after-burners increase engine efficiency

We will get the maximum propulsive efficiency when...

The thrust of a rocket engine is defined by:

1- mass flow x exhaust gases velocity

2- engine's mass flow x aircraft velocity

3- the force as a result of a certain mass flow acceleration

Amongst the statements below, choose the correct answer...

Which of the following statements is true?

1 A turbofan CAN NOT fly to a supersonic regime.

2 Bypass ratio of a military turbofan is usually SMALLER than that of a civil turbofan.

3 A turbofan increases the Thrust and Efficiency WHILE reducing the engine noise.

About the combustion chamber:

1 A combustion chamber can be cooled by introducing air through the walls of it.

2 About 25% of the air intake of a jet engine is used to cool the combustion chamber.

3 The flame temperature is lower than the temperature of the walls of the combustion chamber.

Talking about rocket and turbojet engines...

1 a jet engine needs the oxidiser, that comes from outside

2 a rocket engine can be operated under the water

3 a rocket engine needs no atmosphere outside to operate

When a compressor works nominally, then