Thehighest pressure in a gas turbine engine is:
in the nozzle guide vanes.
an entry to the combustion chamber.
in the centre of the combustion chamber.
One advantage of an annular combustion chamber system is that:
There are no flame propagation problems.
There is unrestricted airflow at maximum r.p.m
The diameter of the engine is reduced.
Of the air that by-passes the snout, what percentage enters the flame tube in the primary zone?
A cannular combustion system is:
A set of flame tubes, each of which is mounted in a separate air casing.
A set of flame tubes enclosed in a common air casing.
One common flame tube enclosed in a common air casing.
In a turbo-jet engine, combustion takes place at a constant:
Swirl vanes in the combustion chamber:
increase the velocity of the airflow.
reduce the velocity of the airflow.
prevent compressor stall.
The air entering combustion chamber is divided; a small percentage is used in combustion, the rest:
is used to cool both gases exiting the chamber and the walls of the air casing.正确答案)
is used to reduce the oil temperature and cool the turbine blades.
is used only for cooling the gases before they exit the combustion chamber.
The effect on the temperature and pressure of the gases as they pass across the turbine最高分值：6分) is:
both their temperature and pressure increase.
their temperature increases and their pressure decreases.
both their temperature and pressure decrease.
Nozzle guide vanes are fitted before the turbine:
to increase the velocity of the gas flow therefore reducing its pressure.
to decrease the velocity of the gas flow therefore increasing its pressure.
to increase the temperature of the gas flow.
One reason for shrouding turbine blades is:
to enable thinner blades to be used.
to improve efficiency and reduce vibration.
to minimise blade end erosion.
