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
21. At constant RPM, the pressure ratio of the compressor
and the temperature rise across the compressor.
A. increases with height.
B. remains constant irrespective of height.
C. decrease with height.
22. With the aircraft stationary, propulsive efficiency.
A. depends on RPM.
B. is minimum.
C. is maximum.
23. The efficiency of conversion of kinetic energy into
propulsive work is a measure of.
A. mechanical efficiency.
B. propulsive efficiency.
C. thermal efficiency.
24. What effect does high atmospheric humidity have on the
operation of a jet engine?.
A. Decreases compressor and turbine RPM.
B. Decreases engine pressure ratio.
C. Has little or no effect.
25. Power is adjusted in a gas turbine engine by.
A. increasing fuel flow.
B. increasing air and fuel flow.
C. increasing airflow to the combustion chamber.
26. The engine rating plug.
A. is permanently connected to the E E C.
B. is connected to the EPR transmitter.
C. is permanently connected to the Engine casing.
27. Flat Rated thrust is defined as.
A. the thrust at the ambient temperature point above which
thrust drops below 100%.
B. that power achieved at idle RPM.
C. that power achieved at maximum EGT.
28. Thrust rating on an FADEC controlled engine can be
changed by.
A. varying the ballast resistor in the EGT system.
B. changing the engine rating plug.
C. varying the EPR datum plug.
29. Propeller torque is analogous to.
A. engine RPM.
B. shaft horsepower.
C. propeller RPM.
30. The total power in a turboprop engine is the.
A. SHP.
B. BHP.
C. E S HP .
ABOVE QUESTIONS WITH ANSWERS
21. At constant RPM, the pressure ratio of the compressor and the temperature rise across the compressor.
A. increases with height.
B. remains constant irrespective of height.
C. decrease with height.
Ans : remains constant irrespective of height.
Explanation: Jeppesen Aircraft Gas Turbine Powerplant Page 3-20 refers.
22. With the aircraft stationary, propulsive efficiency.
A. depends on RPM.
B. is minimum.
C. is maximum.
Ans : is minimum.
Explanation: Jeppesen Gas Turbine Powerplants Page 2-29 refers.
23. The efficiency of conversion of kinetic energy into propulsive work is a measure of.
A. mechanical efficiency.
B. propulsive efficiency.
C. thermal efficiency.
Ans : propulsive efficiency.
Explanation: Jeppesen Gas Turbine Powerplants Page 2-29 refers.
24. What effect does high atmospheric humidity have on the operation of a jet engine?.
A. Decreases compressor and turbine RPM.
B. Decreases engine pressure ratio.
C. Has little or no effect.
Ans : Has little or no effect.
Explanation: Jeppesen A&P Technician Propulsion Textbook 7-70.
25. Power is adjusted in a gas turbine engine by.
A. increasing fuel flow.
B. increasing air and fuel flow.
C. increasing airflow to the combustion chamber.
Ans : increasing air and fuel flow.
Explanation: You cannot have extra fuel without extra air.
26. The engine rating plug.
A. is permanently connected to the E E C.
B. is connected to the EPR transmitter.
C. is permanently connected to the Engine casing.
Ans : is permanently connected to the Engine casing.
Explanation: Jeppesen Aircraft Powerplant Page 7-21.
27. Flat Rated thrust is defined as.
A. the thrust at the ambient temperature point above which thrust drops below 100%.
B. that power achieved at idle RPM.
C. that power achieved at maximum EGT.
Ans : the thrust at the ambient temperature point above which thrust drops below 100%.
Explanation: Jeppesen Aircraft Powerplant Page 7-34.
28. Thrust rating on an FADEC controlled engine can be changed by.
A. varying the ballast resistor in the EGT system.
B. changing the engine rating plug.
C. varying the EPR datum plug.
Ans : changing the engine rating plug.
Explanation: Jeppesen Aircraft Powerplant Page 7-21 refers.
29. Propeller torque is analogous to.
A. engine RPM.
B. shaft horsepower.
C. propeller RPM.
Ans : shaft horsepower.
Explanation: Propeller torque is equal and opposite to SHP under steady state conditions.
30. The total power in a turboprop engine is the.
A. SHP.
B. BHP.
C. E S HP .
Ans : E S HP .
Explanation: E S HP = shaft horse power plus residual gas exhaust thrust.
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