2A656 CDC 4
.jpg "2A656 CDC 4 - Quiz")
Electrical & Enviornmental 5 Level Test
- 1.
(617) If one outflow safety valve opens when the aircraft starts to pressurize, you should check the corresponding
- A.
Pneumatic relay.
- B.
Rate metering valve.
- C.
Manual control valve.
- D.
Cabin pressure controller.
Correct Answer
A. Pneumatic relay. -
- 2.
(617) The isobaric mechanism in the pressure controller consists of
- A.
An aneroid only.
- B.
A diaphragm only.
- C.
An aneroid and spring.
- D.
An aneroid and diaphragm.
Correct Answer
C. An aneroid and spring. -
- 3.
(617) Which condition would cause an aircraft to not pressurize?
- A.
Manual control valve stuck open.
- B.
Isobaric metering valve stuck closed.
- C.
Cabin pressure controller filter partially clogged.
- D.
The test valve handle is in the TEST ONLY-ALL OFF position.
Correct Answer
A. Manual control valve stuck open. -
- 4.
(617) Which component allows each cabin pressurization system outflow safety valve to operate at the same time and to be subject to the same pressure?
- A.
Poppet valve.
- B.
Pneumatic relay.
- C.
Rate control system.
- D.
Cabin pressure controller.
Correct Answer
B. Pneumatic relay. -
- 5.
(616) Which component provides the control by which the canopy seal is inflated and deflated in unison with the opening and closing of the canopy?
- A.
Bellcrank.
- B.
Check valve.
- C.
Bellows face plate.
- D.
Pressure regulator.
Correct Answer
D. Pressure regulator. -
- 6.
(616) The action of the outflow valve in a fixed-isobaric, single-differential pressurization system is controlled by
- A.
A jet pump.
- B.
Filtering cabin air.
- C.
The unpressurized range.
- D.
Regulating control chamber pressure.
Correct Answer
D. Regulating control chamber pressure. -
- 7.
(616) Which pressurization range maintains a constant cabin pressure?
- A.
Isobaric.
- B.
Differential.
- C.
Unpressurized.
- D.
Dual differential.
Correct Answer
A. Isobaric. -
- 8.
(615) During flight, in automatic, the air-conditioning system (ACS) is delivering only cold air,this malfunction could be caused by the
- A.
Thermostat.
- B.
Thermal switch.
- C.
Temperature sensor.
- D.
Temperature limiter.
Correct Answer
C. Temperature sensor. -
- 9.
(614) A portion of the bleed air used for wing anti-icing is dumped overboard, the remaining air
- A.
Controls the modulating valve.
- B.
Returns to the jet pump as recirculating air.
- C.
Becomes a reference temperature for the thermostat.
- D.
Assists the ejector nozzles in drawing air across the heat exchanger.
Correct Answer
B. Returns to the jet pump as recirculating air. -
- 10.
(614) Bleed air airflow through the anti-icing distribution tube is modulated by the control valve in response to temperature changes that are sensed by the
- A.
Thermal sensor.
- B.
Control circuit.
- C.
Temperature switch.
- D.
Pneumatic thermostat.
Correct Answer
D. Pneumatic thermostat. -
- 11.
(613) The windshield rain removal drain will open below what pressure?
- A.
5 psi.
- B.
7 psi.
- C.
9 psi.
- D.
11 psi.
Correct Answer
A. 5 psi. -
- 12.
(614) In the bleed air anti-icing system, the engine bleed air supply duct has a distribution duct (piccolo tube) that may be attached to the leading edge section. If it is, then what must happen to replace the tube?
- A.
Can only be replaced at depot level.
- B.
Remove tube through the wing butt access panel.
- C.
Remove tube through the trailing edge access panels.
- D.
Leading edge section must be removed to replace the tube.
Correct Answer
D. Leading edge section must be removed to replace the tube. -
- 13.
(612) If #4 and #5 non-electrostatic application (NESA) pilot’s window are inoperative and #3 window is operating satisfactory, the probable cause is the
- A.
Thermal switch and wiring.
- B.
Sensing element and wiring.
- C.
Autotransformer and wiring.
- D.
Temperature controller and wiring.
Correct Answer
A. Thermal switch and wiring. -
- 14.
(613) The venturi in the windshield rain removal system
- A.
Regulates airflow to the rain removal system.
- B.
Prevents the primary heat exchanger from overheating.
- C.
Provides an even distribution of bleed air across the windshields.
- D.
Assists the air-conditioning system in maintaining regulated airflow.
Correct Answer
B. Prevents the primary heat exchanger from overheating. -
- 15.
(611) What is the maximum G force that the average pilot can withstand when wearing an anti-G suit?
- A.
4–5 Gs.
- B.
6–7 Gs.
- C.
8–9 Gs.
- D.
10–11 Gs.
Correct Answer
B. 6–7 Gs. -
- 16.
(611) The purpose of the anti-G suit system is to supply air pressure to
- A.
Inflate the pilot’s anti-G suit.
- B.
Exert pressure on the pilots lungs.
- C.
Offset the effects of negative G-forces.
- D.
Prevent blood from rushing to the pilot’s brain.
Correct Answer
A. Inflate the pilot’s anti-G suit. -
- 17.
(611) The anti-G suit prevents
- A.
Blood from rushing to the brain.
- B.
A restricted flow of blood to the heart.
- C.
Blood from pooling in the lower portions of the body.
- D.
Overexertion of the heart when G-forces are encountered.
Correct Answer
C. Blood from pooling in the lower portions of the body. -
- 18.
(610) Pressure to the floor heat ejector on a cargo aircraft floor heat system is regulated by the
- A.
Floor heat shutoff valve.
- B.
Pneumatic control thermostat.
- C.
Pneumatic temperature anticipator.
- D.
Floor heat modulating and shutoff valve.
Correct Answer
D. Floor heat modulating and shutoff valve. -
- 19.
(610) On a cargo type aircraft, the function of the floor heat system pneumatic anticipator is to
- A.
Control the floor heat shutoff valve.
- B.
Respond to rapid temperature changes.
- C.
Respond to gradual temperature changes.
- D.
Send a signal to the control box amplifier section.
Correct Answer
B. Respond to rapid temperature changes. -
- 20.
The cargo aircraft temperature control component that produces an electrical signal that causes the temperature control valve to increase or decrease compartment temperature as required to correct an unbalanced bridge condition is the temperature control
- A.
Box.
- B.
Sensor.
- C.
Limiter.
- D.
Rheostat.
Correct Answer
A. Box. -
- 21.
(609) The water separator over temperature switch actuates at
- A.
175 ± 20 (°F).
- B.
175 ± 10°F.
- C.
155 ± 20°F.
- D.
155 ± 10°F.
Correct Answer
B. 175 ± 10°F. -
- 22.
(610) The outlet bleed air temperature of the primary heat exchanger in a cargo air-conditioning system exceeds 540°F.When this happens, the high-limit section of the temperature anticipator sensor
- A.
Opens the cooling air valve.
- B.
Opens the ejector air valve.
- C.
Closes the primary heat exchanger shutoff valve.
- D.
Closes the bleed air pressure regulator and shutoff valve.
Correct Answer
D. Closes the bleed air pressure regulator and shutoff valve. -
- 23.
(609) When pressure is high enough to cause a bomber air-conditioning expansion turbine to exceed 110 percent of its maximum operating speed, the
- A.
Cold air and flow control valves close.
- B.
Cabin temperature control system (CTCS) pressure regulator/shutoff and cold air valves close.
- C.
Flow control/shutoff and air conditioning system (ACS) pressure regulator/shutoff valves close.
- D.
ACS pressure regulator/shutoff and CTCS pressure regulator/shutoff valves close.
Correct Answer
C. Flow control/shutoff and air conditioning system (ACS) pressure regulator/shutoff valves close. -
- 24.
(608) Which cabin safety device prevents a fighter air-conditioning system from overheating?
- A.
Overheat switch.
- B.
Temperature sensor.
- C.
Temperature control switch.
- D.
Manual temperature limiter.
Correct Answer
D. Manual temperature limiter. -
- 25.
(609) Bleed air inlet pressure is maintained at 40 pounds per square inch gage (psig—at sea level) on a bomber air-conditioning system (ACS) by the
- A.
Pressure limiter.
- B.
ACS flow control and shutoff valve.
- C.
ACS pressure regulator and shutoff valve.
- D.
Cabin temperature control system pressure regulator and shutoff valve.
Correct Answer
C. ACS pressure regulator and shutoff valve. -
- 26.
(608) What air-conditioning component prevents excessive moisture from reaching the cockpit of a fighter aircraft?
- A.
Defog valve.
- B.
Anti-ice valve.
- C.
Water separator.
- D.
Cabin dual-temperature mixing valve.
Correct Answer
C. Water separator. -
- 27.
(608) The temperature of conditioned air going to the crew compartment depends on the position of the
- A.
Cabin air inlet valve.
- B.
Ground cooling ejector valve.
- C.
Water separator bypass valve.
- D.
Cabin dual-temperature mixing valve.
Correct Answer
D. Cabin dual-temperature mixing valve. -
- 28.
(608) How is the warning light in the cockpit activated if duct pressure on a fighter air conditioning system becomes excessive?
- A.
Turbine overspeed switch.
- B.
Cabin temperature limiter.
- C.
Manual temperature limiter.
- D.
Pneumatic-thermal overheat switch.
Correct Answer
A. Turbine overspeed switch. -
- 29.
(607) What air source ventilates the cockpit when smoke or fumes are discharged from the air-conditioning system?
- A.
Liquid air.
- B.
Compressed air.
- C.
Conditioned air.
- D.
Atmospheric air.
Correct Answer
D. Atmospheric air. -
- 30.
(608) When a fighter aircraft air-conditioning system (ACS) is being operated on the ground, the ram air necessary to cool the bleed air flowing through the heat exchangers is provided by the
- A.
Airflow valve.
- B.
Ejector valve.
- C.
Ram air nozzle.
- D.
Air-to-air valve.
Correct Answer
B. Ejector valve. -
- 31.
(607) The bleed air system component that causes the aircraft cooling turbine to slow down when an icing condition occurs is the
- A.
Turbine bypass valve.
- B.
Ice control screen.
- C.
Anti-icing valve.
- D.
Anti-icing controller.
Correct Answer
B. Ice control screen. -
- 32.
(607) The bleed air system water separator anti-icing system prevents the condenser bag from icing by keeping the turbine
- A.
Inlet temperature above 32°.
- B.
Inlet temperature below 32°.
- C.
Outlet temperature above 32°.
- D.
Outlet temperature below 32°.
Correct Answer
C. Outlet temperature above 32°. -
- 33.
(607) Bleed air system water separators remove 70 to 85 percent of the moisture that accumulates in the conditioned air. This is accomplished as a result of
- A.
Rapid expansion.
- B.
Regulated airflow.
- C.
Internal compression.
- D.
Regulated air pressure.
Correct Answer
A. Rapid expansion. -
- 34.
(606) One purpose of the fan in the bleed air system cooling turbine and fan assembly is to prevent
- A.
Excessive air flow.
- B.
Low system pressure.
- C.
Turbine over speeding.
- D.
Moisture in the cold air.
Correct Answer
C. Turbine over speeding. -
- 35.
(606) Some cooling turbines have a pair of unused wires that are cut-off close to the turbine housing. What level of maintenance uses these wires?
- A.
Depot.
- B.
Squadron.
- C.
Intermediate.
- D.
Organizational.
Correct Answer
A. Depot. -
- 36.
(606) The bleed air pre-cooler assembly maintains a constant outlet temperature with the aid of a
- A.
Sensor, modulating valve, and jet pump. sensor, temperature control circuit, and jet pump.
- B.
Sensor, temperature control circuit, and jet pump.
- C.
Modulating valve, sensor, and temperature control circuit.
- D.
Modulating valve, temperature control circuit, and jet pump.
Correct Answer
C. Modulating valve, sensor, and temperature control circuit. -
- 37.
(606) To create a greater cooling effect, atomized water is sprayed across the inlet of the bleed air system secondary heat exchanger by the
- A.
Jet pump.
- B.
Jet sprayer.
- C.
Water aspirator.
- D.
Water separator.
Correct Answer
C. Water aspirator. -
- 38.
(605) The small drill hole in the outlet of some engine bleed air shutoff valves serves to
- A.
Check the valve position.
- B.
Connect a pressure gage.
- C.
Relieve excess pressure.
- D.
Secure valve insulation.
Correct Answer
A. Check the valve position. -
- 39.
(606) An aircraft’s bleed air cooling air system pre-cooler is also known as the
- A.
Air cycle machine.
- B.
Contained air cooler.
- C.
Primary heat exchanger.
- D.
Regenerative temperature changer.
Correct Answer
C. Primary heat exchanger. -
- 40.
(606) A pre-cooler assembly is usually a self-contained cooling package with its own
- A.
Flow control system.
- B.
Safety control system.
- C.
Pressure control system.
- D.
Temperature control system.
Correct Answer
D. Temperature control system. -
- 41.
(606) Hot bleed air used for air-conditioning is cooled in a heat exchanger by
- A.
Ram air.
- B.
Rapid expansion.
- C.
Mixing bleed air with ram air.
- D.
Water flowing across the heat exchanger core.
Correct Answer
A. Ram air. -
- 42.
(605) The bleed air pressure regulator is supplying the required pressure to the bleed air system, yet the cabin temperature is higher than normal. A system check indicates the cooling turbine is not receiving sufficient airflow to produce effective cooling. What would be the primary cause of the problem?
- A.
Pressure limiter.
- B.
Low system pressure.
- C.
Flow control valve.
- D.
High engine pressure ratio.
Correct Answer
C. Flow control valve. -
- 43.
(605) An excessive pressure in the bleed air system can cause an unusually high cockpit temperature due to
- A.
A bleed air leak.
- B.
An over-speeding turbine.
- C.
High exhaust gas temperature.
- D.
A stuck open pressure relief valve.
Correct Answer
D. A stuck open pressure relief valve. -
- 44.
(605) Low engine pressure ratio (EPR) could be caused by a bleed air system that has
- A.
An orifice that is defective.
- B.
A clamp that has been improperly installed.
- C.
A precooler air ejector valve that is defective.
- D.
A pressure regulator that is installed backwards.
Correct Answer
B. A clamp that has been improperly installed. -
- 45.
(604) You perform a bleed air system leakage check using the pressure decay method with an aircraft engine; the time for the pressure to drop 30 pounds per square inch (psi) took 11 seconds.This indicates that the system leakage test
- A.
Needs to be repeated.
- B.
Results are dangerously excessive.
- C.
Results are below allowable limits.
- D.
Results are within allowable limits.
Correct Answer
D. Results are within allowable limits. -
- 46.
24. (604) Bleed air leaks are permissible
- A.
Around valve shafts.
- B.
At low-pressure connections.
- C.
Before the bleed air engine tapoff.
- D.
On the bleed air ducting center wing section.
Correct Answer
A. Around valve shafts. -
- 47.
(603) Expansion joints in bleed air systems are best used on
- A.
Ram air ducting.
- B.
Long runs of ducting.
- C.
Low-pressure ducting.
- D.
Short runs of ducting.
Correct Answer
D. Short runs of ducting. -
- 48.
(604) Leaks can best be detected during an operational check of the bleed air distribution system by
- A.
Listening and feeling.
- B.
Using an ultrasonic leak detector only.
- C.
Feeling only because leaking air may be hot.
- D.
Listening only because leaking air may be at high pressure.
Correct Answer
A. Listening and feeling. -
- 49.
(603) Which lubricant can be used on a beaded channel clamp sleeve to ease installation?
- A.
Soap
- B.
Water
- C.
Grease
- D.
Silicone
Correct Answer
B. Water -
- 50.
(603) What corrective action should be taken when a compressible flange duct end becomes distorted?
- A.
Replace the duct flange ends.
- B.
Use a gasket with the duct ends.
- C.
Reposition the duct for better sealing.
- D.
Reshape the duct flange ends to its original shape.
Correct Answer
D. Reshape the duct flange ends to its original shape. -
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Feb 15, 2013Quiz Edited by
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Apr 13, 2012Quiz Created by
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