gas turbine thrust

#1. EPR is a

• ARatio between ambient pressure and exhaust pressure.
• BRatio between ambient pressure and fan pressure.
• CRatio between intake pressure and compressor delivery pressure.
• DRatio between exhaust pressure and intake pressure.

#2. In a high by pass engine whose fan max rpm is 20000rpm, when turning at 5000rpm will develop approx.

• A25% take off thrust.
• B50% take off thrust
• C5% take off thrust
• D15% take off thrust.

#3. With an increase in altitude which of the following statements are correct for a jet aircraft with constant engine speed for a fixed throttle setting? 1. Temperature and pressure reduce with a resulting drop in thrust. 2. Fuel consumption will increase. 3. Fuel consumption will decrease. 4. Specific fuel consumption will increase. 5. Specific fuel consumption will decrease. 6. Specific fuel consumption stays relatively the same 7. Temperature and pressure will reduce, resulting in an increase in thrust.

• A1, 3, 6.
• B2, 4, 1.
• C7, 2, 4.
• D1, 2, 5