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81. If the tip clearance in a centrifugal compressor is too small.
A. there would be pressure losses through leakage.
B. there is danger of seizure.
C. aerodynamic buffeting would cause vibration.
82. A 1st stage LP compressor blade is able to continue in service if the damage is within limits, and within the.
A. middle third of blade chord-wise.
B. outer third only.
C. root section only.
83. What is meant by a compressor stage?.
A. One rotor and one stator assembly.
B. All rotors and stators.
C. One rotor and one guide vane assembly.
84. What is the normal pressure rise across each compressor stage of an axial flow compressor?.
A. 1.5:1.
B. 1.2:1.
C. 5:1.
85. Where does compression take place as air passes through an axial flow compressor?.
A. Rotor blades.
B. Stator Blades.
C. Rotor and Stator blades.
86. Nozzle Guide Vane bow is an indication of.
A. engine overspeed.
B. engine overheat.
C. engine shock loading.
87. A build up of foreign objects and dirt on compressor blades.
A. has a large effect on compressor efficiency and may cause corrosion.
B. has no effect on the efficiency of the compressor but may cause corrosion.
C. has no effect on compressor efficiency due to the speed of rotation.
88. What is the purpose of the stator vanes in the compressor section of a gas turbine engine?.
A. Increase the velocity of the airflow.
B. Control direction of the airflow.
C. Prevent compressor surge.
89. In a twin spool compressor, the LP section runs at.
A. a lower RPM than the HP spool.
B. a higher RPM than the HP spool.
C. the same RPM than the HP spool.
ABOVE QUESTIONS WITH ANSWERS
81. If the tip clearance in a centrifugal compressor is too small.
A. there would be pressure losses through leakage.
B. there is danger of seizure.
C. aerodynamic buffeting would cause vibration.
82. A 1st stage LP compressor blade is able to continue in service if the damage is within limits, and within the.
A. middle third of blade chord-wise.
B. outer third only.
C. root section only.
83. What is meant by a compressor stage?.
A. One rotor and one stator assembly.
B. All rotors and stators.
C. One rotor and one guide vane assembly.
84. What is the normal pressure rise across each compressor stage of an axial flow compressor?.
A. 1.5:1.
B. 1.2:1.
C. 5:1.
85. Where does compression take place as air passes through an axial flow compressor?.
A. Rotor blades.
B. Stator Blades.
C. Rotor and Stator blades.
86. Nozzle Guide Vane bow is an indication of.
A. engine overspeed.
B. engine overheat.
C. engine shock loading.
87. A build up of foreign objects and dirt on compressor blades.
A. has a large effect on compressor efficiency and may cause corrosion.
B. has no effect on the efficiency of the compressor but may cause corrosion.
C. has no effect on compressor efficiency due to the speed of rotation.
88. What is the purpose of the stator vanes in the compressor section of a gas turbine engine?.
A. Increase the velocity of the airflow.
B. Control direction of the airflow.
C. Prevent compressor surge.
89. In a twin spool compressor, the LP section runs at.
A. a lower RPM than the HP spool.
B. a higher RPM than the HP spool.
C. the same RPM than the HP spool.
ABOVE QUESTIONS WITH ANSWERS
81. If the tip clearance in a centrifugal compressor is too small.
A. there would be pressure losses through leakage.
B. there is danger of seizure.
C. aerodynamic buffeting would cause vibration.
Ans : aerodynamic buffeting would cause vibration.
Explanation: Rolls Royce The Jet Engine page 22 para 12 refers to too small a clearance setting up aerodynamic buffet.
82. A 1st stage LP compressor blade is able to continue in service if the damage is within limits, and within the.
A. middle third of blade chord-wise.
B. outer third only.
C. root section only.
Ans : outer third only.
Explanation: Repairs across the chord or at the root are normally prohibited, outer third is the only safe answer.
83. What is meant by a compressor stage?.
A. One rotor and one stator assembly.
B. All rotors and stators.
C. One rotor and one guide vane assembly.
Ans : One rotor and one stator assembly.
Explanation: Para 13 page 22 of Rolls Royce the Jet Engine refers.
84. What is the normal pressure rise across each compressor stage of an axial flow compressor?.
A. 1.5:1.
B. 1.2:1.
C. 5:1.
Ans : 1.2:1.
Explanation: Para 20 page 25 of Rolls Royce the Jet Engine refers.
85. Where does compression take place as air passes through an axial flow compressor?.
A. Rotor blades.
B. Stator Blades.
C. Rotor and Stator blades.
Ans : Rotor and Stator blades.
Explanation: Compression occurs through all stages figure 3.9 page 25 of Rolls Royce the Jet Engine refers.
86. Nozzle Guide Vane bow is an indication of.
A. engine overspeed.
B. engine overheat.
C. engine shock loading.
Ans : engine overheat.
Explanation: Early turbines, both blades and NGV were susceptible to 'creep' -- prolonged exposure to excessive heat.
87. A build up of foreign objects and dirt on compressor blades.
A. has a large effect on compressor efficiency and may cause corrosion.
B. has no effect on the efficiency of the compressor but may cause corrosion.
C. has no effect on compressor efficiency due to the speed of rotation.
Ans : has a large effect on compressor efficiency and may cause corrosion.
Explanation: Compressor washes are used to reduce this problem.
88. What is the purpose of the stator vanes in the compressor section of a gas turbine engine?.
A. Increase the velocity of the airflow.
B. Control direction of the airflow.
C. Prevent compressor surge.
Ans : Control direction of the airflow.
Explanation: Rolls Royce The Jet Engine page 22 para 13.
89. In a twin spool compressor, the LP section runs at.
A. a lower RPM than the HP spool.
B. a higher RPM than the HP spool.
C. the same RPM than the HP spool.
Ans : a lower RPM than the HP spool.
Explanation: NIL
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