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. The purpose of a bleed valve, located in the beginning stages of the compressor is to.
A. vent some of the air overboard to prevent a compressor stall.
B. control excessively high RPM to prevent a compressor stall.
C. vent high ram air pressure overboard to prevent a compressor stall.
22. During the low RPM range on an axial flow gas turbine engine, in what position are the variable intake guide vanes and bleed valves?.
A. At maximum swirl position, bleed valves open.
B. At maximum swirl position, bleed valves closed.
C. At minimum swirl position, bleed valves closed.
23. The energy changes that take place in the impeller of a centrifugal compressor are.
A. pressure decrease, velocity decrease, temperature increase.
B. pressure increase, velocity decrease, temperature increase.
C. pressure increase, velocity increase, temperature increase.
24. What is the primary advantage of an axial flow compressor over a centrifugal compressor?.
A. High frontal area.
B. Greater pressure ratio.
C. Less expensive.
25. Compression occurs.
A. across stators and rotors.
B. across rotors.
C. across stators.
26. Which of the following can cause fan blade shingling in a turbofan engine?.
A. Large, rapid throttle movements and FOD.
B. Engine over temperature, large, rapid throttle movements and FOD.
C. Engine overspeed and large, rapid throttle movements.
27. Severe rubbing of turbine engine compressor blades will usually cause.
A. cracking.
B. bowing.
C. galling.
28. Which two elements make up the axial flow compressor assembly?.
A. Rotor and stator.
B. Stator and diffuser.
C. Compressor and manifold.
29. If the RPM of an axial flow compressor remains constant, the angle of attack of the rotor blades can be changed by.
A. changing the compressor diameter.
B. changing the velocity of the airflow.
C. increasing the pressure ratio.
30. The gas turbine Compressor Pressure Ratio is.
A. Compressor inlet pressure divided by Compressor discharge pressure.
B. Mass of air bypassing the combustion system divided by Mass of air going through the combustion system.
C. Compressor discharge pressure divided by Compressor inlet pressure.
ABOVE QUESTIONS WITH ANSWERS
21. The purpose of a bleed valve, located in the beginning stages of the compressor is to.
A. vent some of the air overboard to prevent a compressor stall.
B. control excessively high RPM to prevent a compressor stall.
C. vent high ram air pressure overboard to prevent a compressor stall.
Ans : vent some of the air overboard to prevent a compressor stall.
Explanation: NIL.
22. During the low RPM range on an axial flow gas turbine engine, in what position are the variable intake guide vanes and bleed valves?.
A. At maximum swirl position, bleed valves open.
B. At maximum swirl position, bleed valves closed.
C. At minimum swirl position, bleed valves closed.
Ans : At maximum swirl position, bleed valves open.
Explanation: NIL.
23. The energy changes that take place in the impeller of a centrifugal compressor are.
A. pressure decrease, velocity decrease, temperature increase.
B. pressure increase, velocity decrease, temperature increase.
C. pressure increase, velocity increase, temperature increase.
Ans : pressure increase, velocity increase, temperature increase.
Explanation: rolls royce book page 21.
24. What is the primary advantage of an axial flow compressor over a centrifugal compressor?.
A. High frontal area.
B. Greater pressure ratio.
C. Less expensive.
Ans : Greater pressure ratio.
Explanation: NIL.
25. Compression occurs.
A. across stators and rotors.
B. across rotors.
C. across stators.
Ans : across stators and rotors.
Explanation: Jepperson Gas Turbine Powerplants Page 3-24 refers.
26. Which of the following can cause fan blade shingling in a turbofan engine?.
A. Large, rapid throttle movements and FOD.
B. Engine over temperature, large, rapid throttle movements and FOD.
C. Engine overspeed and large, rapid throttle movements.
Ans : Large, rapid throttle movements and FOD.
Explanation: NIL.
27. Severe rubbing of turbine engine compressor blades will usually cause.
A. cracking.
B. bowing.
C. galling.
Ans : galling.
Explanation: Jeppesen A&P Powerplant Textbook 4-25.
28. Which two elements make up the axial flow compressor assembly?.
A. Rotor and stator.
B. Stator and diffuser.
C. Compressor and manifold.
Ans : Rotor and stator.
Explanation: NIL.
29. If the RPM of an axial flow compressor remains constant, the angle of attack of the rotor blades can be changed by.
A. changing the compressor diameter.
B. changing the velocity of the airflow.
C. increasing the pressure ratio.
Ans : changing the velocity of the airflow.
Explanation: NIL.
30. The gas turbine Compressor Pressure Ratio is.
A. Compressor inlet pressure divided by Compressor discharge pressure.
B. Mass of air bypassing the combustion system divided by Mass of air going through the combustion system.
C. Compressor discharge pressure divided by Compressor inlet pressure.
Ans : Compressor discharge pressure divided by Compressor inlet pressure
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