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WorksheetsChương 2_Tuarbin
Total questions: 42
Worksheet time: 21mins
Name
Class
Date
1.
Câu 66. 66. What type or shape of flight inlet is found on a business jet?
a)
A. Convergent
b)
B. Divergent
c)
C. Variable geometry.
2.
Câu 67. 67. What do the words “variable geometry inlet duct” refer to?
a)
A. A supersonic flight inlet
b)
B. A subsonic flight inlet
c)
C. A movable inlet screen.
3.
Câu 68. 68. What is the velocity of gases flowing at the waits of a C-D inlet duct when the aircraft is flying at supersonic cruise speed?
a)
A. Subsonic
b)
B. Sonic
c)
C. Supersonic
4.
Câu 69. 69. Ram recovery refers to increasing what?
a)
A. Velocity in the flight inlet
b)
B. Thrust in the flight inlet
c)
C. Compression in the flight inlet
5.
Câu 70. 70. The typical subsonic aircraft will receive what compression ratio from its flight inlet at cruise airspeed?
a)
A. 0.5:1
b)
B. 1.5:1
c)
C. 5.0:1
6.
Câu 71. 71. Which of the following is more likely to have a screen installed in its inlet duct?
a)
A. Turbojet
b)
B. Turboprop
c)
C. Turbofan
7.
Câu 72. 72. What is the purpose of the inlet separator?
a)
A. To remove air velocity
b)
B. To remove air pressure
c)
C. To remove sand and ice
8.
Câu 73. 73. The function of an inlet guide vane is to straighten the inlet airflow and direct it into
a)
A. The compressor.
b)
B. The turbine
c)
C. The combustion chamber
9.
Câu 74. 74. What is the cause of compressor stall?
a)
A. Turbulent air in the engine inlet.
b)
B. Icing achieved on most turbofan engine inlets.
c)
C. Both of above reason
10.
Câu 75. 75. If an electrical de-icing system is operating, thrust will.
a)
A. decrease.
b)
B. remain constant.
c)
C. increase.
11.
Câu 76. 76. A bellmouth compressor inlet is used on.
a)
A. helicopters.
b)
B. supersonic aircraft.
c)
C. aircraft with low ground clearance.
12.
Câu 77. 77. Electrical de-icing operates.
a)
A. continuously and intermittently.
b)
B. cyclically independent of ambient air temperature.
c)
C. cyclically dependent on ambient air temperature.
13.
Câu 78. 78. Anti-ice is recommended during.
a)
A. OAT +10°Centigrade and visible moisture.
b)
B. thunderstorms.
c)
C. OAT below 10°Centigrade .
14.
Câu 79. 79. A pitot intake is divergent from front to rear because it.
a)
A. reduces ram compression.
b)
B. produces the maximum amount of ram compression.
c)
C. speeds up the air before it hits the compressor face.
15.
Câu 80. 80. The term 'Ram Ratio' in regard to air intakes is the relationship between.
a)
A. ambient pressure and ambient temperature.
b)
B. ambient temperature and compressor inlet temperature.
c)
C. ambient pressure and compressor inlet pressure.
16.
Câu 81. 81. An increase in the Ram Ratio of an intake will.
a)
A. have no effect upon the temperature of the air.
b)
B. increase the temperature of the air.
c)
C. decrease the temperature of the air.
17.
Câu 82. 82. As an aircraft approaches the transonic range, the aerodynamic efficiency of a Pitot type intake.
a)
A. increases due to the ram effect.
b)
B. decreases due to the shock wave.
c)
C. is not effected by forward speed.
18.
Câu 83. 83. Inlet guide vanes are anti-iced with.
a)
A. rubber boots.
b)
B. thermal blankets.
c)
C. engine bleed air.
19.
Câu 84. 84. Intake air turbulence.
a)
A. decreases the efficiency of the compressor.
b)
B. increases the efficiency of the compressor.
c)
C. has little effect on the efficiency of the compressor.
20.
Câu 85. 85. What will be the effect of operating the intake anti-icing system of a gas turbine engine?.
a)
A. A decrease in power.
b)
B. Increased power at altitude.
c)
C. Increased power for take off.
21.
Câu 86. 86. A Pitot intake is divergent from front to rear because it.
a)
A. produces the maximum amount of ram compression.
b)
B. reduces ram compression and turbulence.
c)
C. speeds up the air before it hits the compressor face.
22.
Câu 87. 87. With an electrical ice protection system, the heating elements operate.
a)
A. continuously.
b)
B. part continuous - part intermittent.
c)
C. intermittently.
23.
Câu 88. 88. The purpose of a bellmouth compressor inlet is to.
a)
A. provide an increased ram air effect at low airspeeds.
b)
B. maximize the aerodynamic efficiency of the inlet.
c)
C. provide an increased pressure drop in the inlet.
24.
Câu 89. 89. The vortex dissipators installed on some turbine-powered aircraft to prevent engine FOD utilize.
a)
A. variable geometry inlet ducts.
b)
B. variable inlet guide vanes (IGV) and/or variable first stage fan blades.
c)
C. a stream of engine bleed air blown toward the ground ahead of the engine.
25.
Câu 90. 90. Variable Ramp Intakes restrict airflow by.
a)
A. diverting the airflow around the intake.
b)
B. reducing the area of the intake.
c)
C. creating shock-waves in the intake.
26.
Câu 91. 91. The inlet door of a variable geometry intake at supersonic speeds will be.
a)
A. closed.
b)
B. open.
c)
C. mid-Position.
27.
Câu 92. 92. When operating an engine in icing conditions, care should be taken when the.
a)
A. temperature is below +10°Centigrade with visible moisture.
b)
B. temperature is below 10°Centigrade.
c)
C. temperature is below 0°Centigrade.
28.
Câu 93. 93. Anti-icing for a turboprop is achieved by.
a)
A. bleed air supply from compressor.
b)
B. electric bonded heater mats.
c)
C. hot oil supply from lubrication system.
29.
Câu 94. 94. What purpose does the nose cone serve on the(N1) fan on a high bypass engine?.
a)
A. Streamlined fairing.
b)
B. Reduce and straighten any turbulent air.
c)
C. Assist in diffusing airflow.
30.
Câu 95. 95. Electrical anti-ice.
a)
A. heats oil which is distributed around engine.
b)
B. heats elements, placed under mats around engine.
c)
C. heats air which is distributed around engine.
31.
Câu 96. 96. The cycling speed of the electrical de-icing mat.
a)
A. comes in 4 speeds.
b)
B. is not affected by weather conditions.
c)
C. is affected by weather conditions.
32.
Câu 97. 97. The variable inlet guide vanes are operated.
a)
A. by fuel pressure.
b)
B. electrically from cockpit.
c)
C. using N1 fan speed.
33.
Câu 98. 98. The velocity of air on entry to compressor inlet on an aircraft flying supersonic speed would be controlled at.
a)
A. Mach 2.2.
b)
B. Mach 1.
c)
C. Mach 0.4.
34.
Câu 99. 99. If an inlet is choked then the velocity.
a)
A. increases and pressure decreases.
b)
B. increases and pressure increases.
c)
C. decreases and pressure increases.
35.
Câu 100. 100. In an aircraft flying at supersonic speed, to reduce the air velocity at the compressor, the variable intake.
a)
A. exhaust jet cone area increased.
b)
B. throat area is decreased.
c)
C. throat area is increased.
36.
Câu 101. 101. A well designed intake will take advantage of forward speed by.
a)
A. converting kinetic energy into pressure energy.
b)
B. converting velocity energy into kinetic energy.
c)
C. converting pressure energy of the air into kinetic energy.
37.
Câu 102. 102. What type of intake is one that decreases gradually in area and then increases?.
a)
A. Convergent.
b)
B. Convergent/Divergent.
c)
C. Divergent.
38.
Câu 103. 103. In an electrical de-icing system, the main elements will be on.
a)
A. intermittently, 8 times a minute, dependant on OAT .
b)
B. intermittently, 4 times a minute, dependant on OAT .
c)
C. continuously and intermittently.
39.
Câu 104. 104. Intakes are designed to.
a)
A. decrease the intake air pressure.
b)
B. decelerate the free air stream flow.
c)
C. accelerate the free air stream flow.
40.
Câu 105. 105. turboprop engine inlet anti-ice system operates.
a)
A. continuously.
b)
B. cyclically dependant on weather conditions.
c)
C. cyclically independent on weather conditions.
41.
Câu 106. 106. What is true for a bellmouth intake?.
a)
A. Pressure increases and velocity decreases.
b)
B. Velocity increases and pressure decreases.
c)
C. Pressure and velocity decrease.
42.
Câu 107. 107. In a variable geometry intake, the velocity of the air on the engine compressor face is controlled by.
a)
A. ramp and spill doors.
b)
B. intake augmentation doors.
c)
C. shock-wave pattern, ramp and spill doors.
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