NOTE
TO CHECK YOUR PREPARATION ,PLZ WRITE DOWN YOUR SELECTED OPTIONS (A,B,C) ON ROUGH PAGE AND AT THE END OF QUIZ , VERIFY YOUR SELECTED OPTIONS WITH THE CORRECT OPTIONS GIVEN BELOW
31. In a dive, with the throttles fixed, the EPR will.
A. not change.
B. increase.
C. decrease.
32. With an increase in forward speed, the engine thrust.
A. decreases slightly but recover due to ram effect.
B. increases.
C. decreases.
33. The main factor considered when designing an engine is.
A. maximum fuel consumption.
B. maximum turbine temperature.
C. maximum tip speed.
34. To ensure an engine maintains self sustaining speed.
A. idle remains same for any density.
B. idle increases with density decrease.
C. idle increases with density increase.
35. A factor that limits EGT is the.
A. jet pipe.
B. compressors.
C. turbine.
36. Thrust will.
A. increase at high temperatures.
B. decrease at low temperatures.
C. increase at low temperatures.
37. Across the turbines, there is.
A. a general temperature rise.
B. a general temperature drop.
C. an isometric expansion.
38. If the throttle position remains constant.
A. with increasing OAT, RPM and TGT will increase.
B. with decreasing OAT, RPM will increase.
C. with increasing OAT, TGT will increase.
39. If an aircraft climbs with a fixed throttle position.
A. thrust decreases and RPM increases.
B. thrust and RPM remain the same.
C. thrust increases and RPM remains the same.
40. Ram pressure recovery will generally take effect at
aircraft speeds of.
A. mach 1.
B. mach 0.1 - 0.2.
C. only when the aircraft is stationary with engines running.
ABOVE QUESTIONS WITH ANSWERS
31. In a dive, with the throttles fixed, the EPR will.
A. not change.
B. increase.
C. decrease.
Ans : decrease.
Explanation: Jeppesen Aircraft Gas Turbines page 12-18 refers.
32. With an increase in forward speed, the engine thrust.
A. decreases slightly but recover due to ram effect.
B. increases.
C. decreases.
Ans : decreases slightly but recover due to ram effect.
Explanation: Jeppesen Aircraft Gas Turbine Powerplant Page 2-35 refers.
33. The main factor considered when designing an engine is.
A. maximum fuel consumption.
B. maximum turbine temperature.
C. maximum tip speed.
Ans : maximum turbine temperature.
Explanation: The turbine is the most highly stressed component in the engine.
34. To ensure an engine maintains self sustaining speed.
A. idle remains same for any density.
B. idle increases with density decrease.
C. idle increases with density increase.
Ans : idle increases with density decrease.
Explanation: Rolls Royce The Jet Engine page 103 para 15 refers.
35. A factor that limits EGT is the.
A. jet pipe.
B. compressors.
C. turbine.
Ans : turbine.
Explanation: Rolls Royce the Jet Engine Page 13 refers.
36. Thrust will.
A. increase at high temperatures.
B. decrease at low temperatures.
C. increase at low temperatures.
Ans : increase at low temperatures.
Explanation: Higher density gives higher mass flow hence higher thrust.
37. Across the turbines, there is.
A. a general temperature rise.
B. a general temperature drop.
C. an isometric expansion.
Ans : a general temperature drop.
Explanation: Rolls Royce the Jet Engine Page 15 shows a temperature decrease across the turbines due to energy extraction.
38. If the throttle position remains constant.
A. with increasing OAT, RPM and TGT will increase.
B. with decreasing OAT, RPM will increase.
C. with increasing OAT, TGT will increase.
Ans : with increasing OAT, RPM and TGT will increase.
Explanation: As OAT increases the air is thinner RPM increases but thrust decreases due to the thin air. Extra fuel is required to increase thrust therefore TGT increases.
39. If an aircraft climbs with a fixed throttle position.
A. thrust decreases and RPM increases.
B. thrust and RPM remain the same.
C. thrust increases and RPM remains the same.
Ans : thrust decreases and RPM increases.
Explanation: Thinner air causes thrust to decrease and the compressor to speed up.
40. Ram pressure recovery will generally take effect at aircraft speeds of.
A. mach 1.
B. mach 0.1 - 0.2.
C. only when the aircraft is stationary with engines running.
Ans : mach 0.1 - 0.2.
Explanation: Jeppesen Gas turbine Powerplant page 3-2 refers. With the aircraft stationary and engines
running intake pressure is negative. As the aircraft begins its take off run the pressure recovers to above
ambient (ram recovery.
No comments:
Post a Comment
Friends if you have any query or you need any help, let me know at mortalmortal789@gmail.com