gas turbine introduction

#1. When gases pass through a convergent duct their:

• AVelocity and temperature increase and their pressure decreases.
• BTheir velocity increases and their temperature and pressure decrease.
• CTheir velocity decreases and their temperature and pressure increase.
• DThey expand adiabatically.

#2. Select the correct order of best propulsive efficiency, from low to high airspeed

• AHigh by-pass ratio turbo jet, Low by-pass ratio turbo jet, Pure turbo jet, Turbo-prop.
• BLow by-pass ratio turbo jet, Pure turbo jet, Turbo-prop, High by-pass ratio turbo jet.
• CPure turbo jet, Turbo-prop, High by-pass ratio turbo jet, Low by-pass ratio turbo jet.
• DTurbo-prop, High by-pass ratio turbo jet, Low by-pass ratio turbo jet, Pure turbo jet.

#3. The highest pressure in a gas turbine engine occurs:

• ABetween the compressor and the combustion chamber.
• BIn the combustion chamber.
• CIn the jet pipe.
• DAt the P1 probe.