gas turbine performance and thrust augmentation

#2. When does the variable nozzle open?

• AWhen the exhaust temperature reaches 1700C
• BAutomatic when after burning selected.
• CAutomatic on take off.
• DAutomatic when approaching Mach 1.

#1. When after burning the jet pipe will:

• AClose to allow for the decreased volume of gas.
• BOpen to allow for the increased volume of gas.
• CRemain the same
• DRemain the same until the temperature reaches 1700C then open.

#3. When leaving the turbine the gas stream:

• AIncreases velocity immediately to maximise thrust.
• BIs diffused to ensure the afterburning flame is stabilised.
• CGoes through a convergent duct to ensure the after-burning flame is stabilised.
• DGoes through a divergent duct to maximise thrust.