Results
Q1. The velocity of the gases in the exhaust unit is held to:
Correct answer is – Mach 0.5 to minimize turbulence
Q2. The exhaust cone:
Correct answer is – prevents the hot gases flowing across the rear turbine face
Q3. The propelling nozzle is designed to:
Correct answer is – increase the velocity and decrease the pressure of the gas stream
Q4. A nozzle is said to be “choked” when:
Correct answer is – the gas flow through it reaches its sonic value
Q5. A choked nozzle:
Correct answer is – implies that no further increase in velocity can be obtained without the increase of heat
Q6. The exhaust gases pass to atmosphere via the propelling nozzle which:
Correct answer is – is a convergent duct, thus it increases the gas velocity
Q7. The jet pipe is insulated from the airframe by:
Correct answer is – a combination of cooling air and insulating material
Q8. The noise from a high ratio bypass engine:
Correct answer is – is predominantly from the fan and the turbine
Q9. The shape of the volume within the jet pipe casing immediately to the rear of the turbine:
Correct answer is – is divergent to reduce the velocity of the gases leaving the turbine
Q10. The turbine rear support struts:
Correct answer is – straighten out any residual whirl in the gas stream
Q11. An exhaust nozzle is said to be choked when the velocity at the throat is:
Correct answer is – at Mach 1
