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. An advantage of the centrifugal flow compressor is its high.
A. ram efficiency.
B. pressure rise per stage.
C. peak efficiency.
32. The compression ratio of an axial flow compressor is a function of the.
A. number of compressor stages.
B. air inlet velocity.
C. rotor diameter.
33. Jet engine turbine blades removed for detailed inspection must be reinstalled in.
A. the same slot.
B. a specified slot 180°away.
C. a specified slot 90°away in the direction of rotation.
34. The procedure for removing the accumulation of dirt deposits on compressor blades is called.
A. the purging process.
B. the soak method.
C. field cleaning.
35. The two types of centrifugal compressor impellers are.
A. impeller and diffuser.
B. single entry and double entry.
C. rotor and stator.
36. Between each row of rotating blades in a compressor, there is a row of stationary blades which act to diffuse the air. These stationary blades are called.
A. stators.
B. rotors.
C. buckets.
37. Bleed valves are.
A. closed at low RPM.
B. always slightly open.
C. closed at high RPM.
38. Compressor field cleaning on turbine engines is performed primarily in order to.
A. prevent engine oil contamination and subsequent engine bearing wear or damage.
B. prevent engine performance degradation, increased fuel costs, and damage or corrosion to gas path surfaces.
C. facilitate flight line inspection of engine inlet and compressor areas for defects or FOD
39. If the LP compressor shaft severed.
A. the LP turbine will speed up and the LP compressor will slow down.
B. the LP compressor of cruise thrust.
C. the HP compressor will slow down.
40. An advantage of a centrifugal compressor is.
A. it is dynamically balanced.
B. it is unaffected by turbulence.
C. it is robust and can stand some shock from icing-up.
ABOVE QUESTIONS WITH ANSWERS
31. An advantage of the centrifugal flow compressor is its high.
A. ram efficiency.
B. pressure rise per stage.
C. peak efficiency.
Ans : peak efficiency.
Explanation: NIL.
32. The compression ratio of an axial flow compressor is a function of the.
A. number of compressor stages.
B. air inlet velocity.
C. rotor diameter.
Ans : number of compressor stages.
Explanation: NIL.
33. Jet engine turbine blades removed for detailed inspection must be reinstalled in.
A. the same slot.
B. a specified slot 180°away.
C. a specified slot 90°away in the direction of rotation.
Ans : the same slot.
Explanation: Jeppesen A&P Powerplant Textbook 4-25.
34. The procedure for removing the accumulation of dirt deposits on compressor blades is called.
A. the purging process.
B. the soak method.
C. field cleaning.
Ans : field cleaning.
Explanation: NIL.
35. The two types of centrifugal compressor impellers are.
A. impeller and diffuser.
B. single entry and double entry.
C. rotor and stator.
Ans : single entry and double entry.
Explanation: NIL.
36. Between each row of rotating blades in a compressor, there is a row of stationary blades which act to diffuse the air. These stationary blades are called.
A. stators.
B. rotors.
C. buckets.
Ans : stators.
Explanation: NIL.
37. Bleed valves are.
A. closed at low RPM.
B. always slightly open.
C. closed at high RPM.
Ans : closed at high RPM.
Explanation: Jeppesen Gas Turbine Powerplants Page 8-7 Refers.
38. Compressor field cleaning on turbine engines is performed primarily in order to.
A. prevent engine oil contamination and subsequent engine bearing wear or damage.
B. prevent engine performance degradation, increased fuel costs, and damage or corrosion to gas path surfaces.
C. facilitate flight line inspection of engine inlet and compressor areas for defects or FOD.
Ans : prevent engine performance degradation, increased fuel costs, and damage or corrosion to gas path surfaces.
Explanation: NIL.
39. If the LP compressor shaft severed.
A. the LP turbine will speed up and the LP compressor will slow down.
B. the LP compressor of cruise thrust.
C. the HP compressor will slow down.
Ans : the LP turbine will speed up and the LP compressor will slow down.
Explanation: The LP Turbine is attached to the LP compressor.
40. An advantage of a centrifugal compressor is.
A. it is dynamically balanced.
B. it is unaffected by turbulence.
C. it is robust and can stand some shock from icing-up.
Ans : it is robust and can stand some shock from icing-up.
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