2A672 Edit Code 6 40-85

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| By Leone2110

Leone2110

Community Contributor

Quizzes Created: 3 | Total Attempts: 1,647

Questions: 48 | Attempts: 317 | Updated: Mar 20, 2023

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Questions and Answers

1.

41.) the portion of the voltage regulator that supplies exciter field voltage is transformer?
- A.
  
  (T1) and rectifier (B3)
- B.
  
  (T3) and rectifier (B2)
- C.
  
  (T2) and rectifier (B1)
- D.
  
  (T1) and rectifier (CR26)
Correct Answer
D. (T1) and rectifier (CR26)

Explanation
The correct answer is (T1) and rectifier (CR26). The exciter field voltage is supplied by the transformer (T1) and rectifier (CR26). The transformer steps down the voltage from the main power source to a lower voltage suitable for the exciter field. The rectifier then converts the AC voltage from the transformer into DC voltage, which is required for the exciter field. Together, the transformer and rectifier provide the necessary exciter field voltage for the voltage regulator.

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2.

Refer to fold out 1. after performing an operational check of the -86d generator set you proceed to shut the unit down. after the generator stops you notice the engine on light continues to glow. what is the probable cause of this trouble?
- A.
  
  S46 open
- B.
  
  S48 open
- C.
  
  S46 closed
- D.
  
  S48 closed
Correct Answer
D. S48 closed

Explanation
The probable cause of the engine on light continuing to glow after shutting down the generator is that s48 is closed. This suggests that there is a fault or malfunction in the switch s48, which is supposed to be open when the generator is shut down. The closed position of s48 is causing a continuous flow of electricity to the engine on light, keeping it illuminated even when the generator is turned off.

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3.

Refer to fold out 1. during operation of the -86 you get no responce when you place s13 in the GENERATE position. a check of voltage at j8, terminal N shows 12 volts DC. whats the probable cause of this trouble?
- A.
  
  M4 is open
- B.
  
  S53 is open
- C.
  
  K23 is open
- D.
  
  K16 is open
Correct Answer
B. S53 is open

Explanation
The probable cause of the trouble is that S53 is open. This means that there is a problem with the switch S53, causing it to not make a connection when placed in the GENERATE position. This is supported by the fact that a check of voltage at j8, terminal N shows 12 volts DC, indicating that power is reaching the terminal but not being transmitted through S53.

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4.

Refer to foldout 1. You are operating an -86 at governed speed but voltage does not build up. What is the probable cause of this trouble?
- A.
  
  S1 is in the automatic position
- B.
  
  R61 is turned fully clockwise
- C.
  
  K16 contacts are closing
- D.
  
  K23 contacts are open
Correct Answer
D. K23 contacts are open

Explanation
The probable cause of the voltage not building up in the -86 is that the K23 contacts are open.

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5.

During operation of the -86 what position do you place control switch S13 in to move the fuel rack and increase the engine speed to 2000 RPM?
- A.
  
  IDLE
- B.
  
  GENERATE
- C.
  
  BUILD UP VOLTS
- D.
  
  AUTO TEST BANK
Correct Answer
B. GENERATE

Explanation
During the operation of the -86, the control switch S13 needs to be placed in the "GENERATE" position in order to move the fuel rack and increase the engine speed to 2000 RPM. This position activates the generator and allows it to produce electrical power, which in turn powers the fuel rack and increases the engine speed.

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6.

Refer to foldout 1. During an operational check of the -86 the shut down solenoid energizes immediately after the engine run indicator illuminates. what is a probable cause of this trouble?
- A.
  
  S48 open
- B.
  
  S46 open
- C.
  
  S49 shorted
- D.
  
  S22 stuck open
Correct Answer
C. S49 shorted

Explanation
The probable cause of the trouble is that the S49 is shorted. This means that there is a direct connection between the two terminals of the solenoid, causing it to energize immediately after the engine run indicator illuminates.

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7.

Refer to fold out 1. During operation of the -86 the low coolant light (DS50) illuminates. but the unit does not shut down. What is th probable cause of this trouble?
- A.
  
  A2
- B.
  
  DS50
- C.
  
  S55 is closed
- D.
  
  S48 is closed
Correct Answer
A. A2

Explanation
The probable cause of the low coolant light (DS50) illuminating but the unit not shutting down could be that S55 is closed and S48 is closed.

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8.

what component controls the strength of the -86 generator exciter field L2?
- A.
  
  Excitation relay K16
- B.
  
  Time delay relay K14
- C.
  
  Voltage regulator VR1
- D.
  
  Automatic manual switch S1
Correct Answer
C. Voltage regulator VR1

Explanation
The voltage regulator VR1 controls the strength of the -86 generator exciter field L2.

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9.

what component on the -86 generator is used to manually increase output voltage?
- A.
  
  Voltage rheostat R61
- B.
  
  Excitation relay K16
- C.
  
  Test bank switch S202
- D.
  
  Auto/manual switch S1
Correct Answer
A. Voltage rheostat R61

Explanation
The voltage rheostat R61 is used to manually increase the output voltage on the -86 generator.

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10.

50.) refer to foldout 1. where is the best point to check volage to the -86 generator exciter field?
- A.
  
  J8, terminal D-F
- B.
  
  J8, terminal V-X
- C.
  
  VR1, terminal C-R
- D.
  
  Automatic-manual switch S1
Correct Answer
A. J8, terminal D-F

Explanation
The best point to check voltage to the -86 generator exciter field is at J8, terminal D-F.

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11.

An -86 is operating and the alternationg current (AC) voltmeter is reading 200 volts AC on all three phases. what do you do?
- A.
  
  Adjust VR1
- B.
  
  Adjust R61
- C.
  
  Adjust VR1 and R61
- D.
  
  Switch S15 to the L-N position
Correct Answer
D. Switch S15 to the L-N position

Explanation
Switching S15 to the L-N position will change the voltmeter reading from 200 volts AC to the correct value. This is because the voltmeter is currently reading the line-to-line voltage, and switching to the L-N position will make it read the line-to-neutral voltage, which is the correct measurement for a single-phase system. Adjusting VR1 or R61 will not correct the voltmeter reading in this case.

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12.

Refer to fold out 1. An -86 gernator set is sent to the shop on a Red X for will not apply power to the aircraft. During the operational check you place S5 in the closed position and the contactor light illuminates. When you release the switch, the contacts opens. What is the probable cause of this trouble?
- A.
  
  S2 is open
- B.
  
  R46 is is open
- C.
  
  K2 is closed
- D.
  
  K17 is closed
Correct Answer
B. R46 is is open

Explanation
The probable cause of this trouble is that R46 is open. When S5 is placed in the closed position, it activates the contactor, causing the contactor light to illuminate. However, when the switch is released, the contacts should remain closed. The fact that the contacts open indicates that there is an issue with R46, which is likely open and preventing the contacts from staying closed.

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13.

What effect does a defective K4 relay have on the -86 generator output circuit?
- A.
  
  K607 de-energizes and K1 De-energizes
- B.
  
  K607 energizes and K1 de-energizes
- C.
  
  K607 de-energizes and K1 energizes
- D.
  
  No effect
Correct Answer
B. K607 energizes and K1 de-energizes

Explanation
A defective K4 relay would cause K607 to energize and K1 to de-energize in the -86 generator output circuit.

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14.

While operating an -86 at governed speed you place S13 in the build up position and the undervoltage light comes on. What is the probable cause of this trouble?
- A.
  
  Voltage regulator
- B.
  
  Plug interlock relay
- C.
  
  Memory time delay relay
- D.
  
  Overvoltage/undervoltage relay
Correct Answer
C. Memory time delay relay

Explanation
The probable cause of the undervoltage light coming on when placing S13 in the build up position while operating an -86 at governed speed is likely the memory time delay relay. The memory time delay relay is responsible for controlling the timing of certain electrical functions, including monitoring voltage levels. In this case, it is possible that the memory time delay relay is malfunctioning or not functioning properly, causing the undervoltage light to activate when it shouldn't.

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15.

You are driving on the flight line and you notice an -86 power unit with all the fault lights on. You try to reset S23 but the light stays on. what is the probable cause of this trouble?
- A.
  
  S30 is shorted
- B.
  
  S23 is stuck open
- C.
  
  K17 contacts are closed
- D.
  
  K23 contacts are closed
Correct Answer
A. S30 is shorted

Explanation
The probable cause of the trouble is that S30 is shorted. This means that there is a problem with the electrical circuit and S30, which is likely a switch or a component related to the fault lights, is not functioning properly. This causes the fault lights to stay on even after attempting to reset S23.

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16.

When troubleshooting any electrical system you can locate a starting point by first finding the?
- A.
  
  Common ground bus
- B.
  
  Main circuit breaker
- C.
  
  External power source
- D.
  
  Last know source of power
Correct Answer
D. Last know source of power

Explanation
When troubleshooting any electrical system, it is important to start by finding the last known source of power. This is because the issue could be related to a power interruption or a faulty power source. By identifying the last known source of power, it becomes easier to trace the problem and determine if there are any disruptions or malfunctions in the power supply. This step helps in narrowing down the potential causes and simplifies the troubleshooting process.

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17.

Which step of troubleshooting is considered the most difficult?
- A.
  
  Recognition and verification
- B.
  
  Isolation and elimination
- C.
  
  Repair and check
- D.
  
  Analysis
Correct Answer
D. Analysis

Explanation
The step of troubleshooting that is considered the most difficult is analysis. This is because analysis involves thoroughly examining the problem, gathering data, and identifying possible causes. It requires critical thinking, problem-solving skills, and the ability to analyze complex information. Analysis also involves considering different scenarios and potential solutions before determining the root cause of the issue. It is a crucial step in troubleshooting as it lays the foundation for effective problem resolution.

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18.

To test the load contactor relay K1, using test probes, in what position must the automatic-manual voltage control switch be placed in?
- A.
  
  Automatic
- B.
  
  Manual
- C.
  
  Test
- D.
  
  Off
Correct Answer
A. Automatic

Explanation
To test the load contactor relay K1, the automatic-manual voltage control switch must be placed in the "Automatic" position. This is because the automatic position allows the voltage control system to function normally, allowing the load contactor relay K1 to be tested accurately. Placing the switch in any other position may disrupt the voltage control system and affect the test results.

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19.

What component on the B809-A generator set fuel system distributes and delivers an accurate amount of fuel to the engine cylinders?
- A.
  
  Injector pump
- B.
  
  Transfer pump
- C.
  
  Injector nozzle
- D.
  
  Throttle actuator
Correct Answer
A. Injector pump

Explanation
The injector pump is responsible for distributing and delivering an accurate amount of fuel to the engine cylinders in a B809-A generator set fuel system. It ensures that the correct amount of fuel is delivered at the right time to optimize engine performance and efficiency. The injector pump pressurizes the fuel and controls its flow, allowing for precise fuel delivery to each cylinder.

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20.

60.) What B809-A generator set speed control system component produces a frequency pulse train for engine speed reference?
- A.
  
  Magnetic Pick up
- B.
  
  Engine speed governor
- C.
  
  Speed trim potentiometer
- D.
  
  Speed control potentiometer
Correct Answer
A. Magnetic Pick up

Explanation
The correct answer is Magnetic Pick up. A magnetic pick up is a component of the generator set speed control system that produces a frequency pulse train for engine speed reference. It detects the rotation of the engine and generates electrical pulses based on the speed of rotation. These pulses are then used by the speed control system to maintain the desired engine speed.

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21.

What signal powers the regulator card output pulse sent to the exciter field of the B809-A generator?
- A.
  
  28.5 VDC
- B.
  
  110 VDC
- C.
  
  115 VAC
- D.
  
  200 VAC
Correct Answer
B. 110 VDC

Explanation
The regulator card output pulse sent to the exciter field of the B809-A generator is powered by 110 VDC.

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22.

What action occurs when the B809A generator set Alternating current (AC) card senses an AC supply fault?
- A.
  
  Only generator output stops
- B.
  
  Only the AC contactor opens
- C.
  
  AC supply warning light illuminates
- D.
  
  AC contactor opens and generator output stops
Correct Answer
D. AC contactor opens and generator output stops

Explanation
When the B809A generator set Alternating current (AC) card senses an AC supply fault, the AC contactor opens and the generator output stops. This means that the generator disconnects from the AC supply and stops producing electricity. The opening of the AC contactor ensures that the faulty AC supply does not cause any damage or harm to the generator or connected devices.

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23.

What condition is sensed by the direct current (DC) card on the B809-A generator set ?
- A.
  
  Overtemperature
- B.
  
  Under frequency
- C.
  
  Over frequency
- D.
  
  Low fuel
Correct Answer
A. Overtemperature

Explanation
The direct current (DC) card on the B809-A generator set senses the condition of overtemperature. This means that the card is designed to detect if the temperature of the generator set exceeds a certain threshold. This is an important feature as overheating can lead to damage or malfunctioning of the equipment. By sensing overtemperature, the DC card can trigger appropriate actions or alarms to prevent any potential issues and ensure the safe operation of the generator set.

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24.

Refer to fold out 2. While operating a B809A generator what switch is closed to provide potential to the exciter field?
- A.
  
  S1, master switch
- B.
  
  S5, run/idle toggle switch
- C.
  
  S3 interlock toggle switch
- D.
  
  PB2 output control pushbutton switch
Correct Answer
B. S5, run/idle toggle switch

Explanation
The S5 run/idle toggle switch is closed to provide potential to the exciter field while operating a B809A generator.

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25.

Refer to folout 2. During high voltage operation of the B809A generator set , what action occurs to prevent the direct current (DC) from closing?
- A.
  
  High sence relay (HSR) energizes
- B.
  
  Interlock (INT) relay energizes
- C.
  
  INT relay de-energizes
- D.
  
  HSR De-energizes
Correct Answer
D. HSR De-energizes

Explanation
During high voltage operation of the B809A generator set, the high sense relay (HSR) is energized. This relay is responsible for preventing the direct current (DC) from closing. Therefore, when the HSR de-energizes, it means that the action of preventing the DC from closing is no longer in effect.

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26.

If you have a loss of residual magnetism in the exciter field poles, what should you do?
- A.
  
  Connect TB4-11 to 14 VDC power source
- B.
  
  Check the field transformer
- C.
  
  Field flash the generator
- D.
  
  Check the fault display
Correct Answer
C. Field flash the generator

Explanation
If there is a loss of residual magnetism in the exciter field poles, the appropriate action to take is to field flash the generator. Field flashing involves applying a temporary DC voltage to the field windings to restore the residual magnetism. This can be done by connecting TB4-11 to a 14 VDC power source. By doing this, the generator's exciter field poles will regain their magnetism, allowing the generator to produce electricity efficiently. Checking the field transformer and fault display may be necessary steps in diagnosing the issue, but field flashing is the specific action required to address the loss of residual magnetism.

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27.

What gas turbine engine component is specifically designed to break if the engine locks up?
- A.
  
  Second stage impeller
- B.
  
  First stage diffuser
- C.
  
  Compressor shaft
- D.
  
  Torsion shaft
Correct Answer
D. Torsion shaft

Explanation
The torsion shaft is specifically designed to break if the engine locks up. This component is responsible for transmitting power between the engine and the propeller. In the event of an engine lock-up, the torsion shaft is designed to break in order to prevent further damage to the engine and surrounding components. Breaking the torsion shaft helps to protect the engine from excessive stress and potential catastrophic failure.

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28.

During the operation of a -60A generator set you noticed the exhaust gas temperature is excessively high. what is the probable cause of this trouble?
- A.
  
  Air oil seals
- B.
  
  Fuel atomizer
- C.
  
  Torus assembly
- D.
  
  Pneumatic thermostat
Correct Answer
D. Pneumatic thermostat

Explanation
The probable cause of the excessively high exhaust gas temperature in a -60A generator set is likely the pneumatic thermostat. The pneumatic thermostat is responsible for regulating the engine's cooling system and maintaining the proper temperature. If the pneumatic thermostat is malfunctioning or stuck, it can cause the engine to overheat, leading to high exhaust gas temperatures.

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29.

What component of the -60 gas turbine engine lubrication system prevents engine operation if oil pressure is too low?
- A.
  
  Oil pressure sequencing switch
- B.
  
  Oil pressure relief valve
- C.
  
  Oil shut off switch
- D.
  
  Main oil pump
Correct Answer
A. Oil pressure sequencing switch

Explanation
The oil pressure sequencing switch is a component of the gas turbine engine lubrication system that is responsible for preventing engine operation if the oil pressure is too low. It is designed to monitor the oil pressure and ensure that it is at a sufficient level before allowing the engine to start or continue running. If the oil pressure falls below the specified threshold, the sequencing switch will interrupt the engine operation to prevent potential damage or failure due to inadequate lubrication. This safety feature helps to protect the engine and ensure its proper functioning.

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30.

While you are operating the -60 generator set, you turn the bleed air switch to ON and the engine speed drops to 98 percent. What is happening in the governor to bring the engine speed up to 100 percent?
- A.
  
  Spring tension is less than centrifugal force and the flyweights move outward opening the bypass port
- B.
  
  Spring tension is less than centrifugal force and the flyweights move outward closing the bypass port
- C.
  
  Spring tension is greater than centrifugal force and the flyweights move inward closing the bypass port
- D.
  
  Spring tension is greater than centrifugal force and the flyweights move inward opening the bypass port
Correct Answer
C. Spring tension is greater than centrifugal force and the flyweights move inward closing the bypass port

Explanation
In this scenario, the correct answer is "Spring tension is greater than centrifugal force and the flyweights move inward closing the bypass port." The governor is responsible for maintaining a constant engine speed. When the bleed air switch is turned on and the engine speed drops to 98 percent, it indicates that there is a decrease in power output. The governor responds by increasing the fuel flow to the engine, which is achieved by closing the bypass port. This action is facilitated by the movement of the flyweights inward, which is possible due to the greater spring tension compared to the centrifugal force.

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31.

What section of the -60 gas turbine engine load control valve controls the opening time?
- A.
  
  Diaphragm
- B.
  
  Rate Control
- C.
  
  Load control
- D.
  
  Mechanical linkage
Correct Answer
B. Rate Control

Explanation
The rate control section of the -60 gas turbine engine load control valve controls the opening time. This section is responsible for regulating the rate at which the valve opens, allowing for precise control over the flow of fuel and air into the engine. By adjusting the rate control, the opening time of the valve can be adjusted to optimize engine performance and efficiency.

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32.

Refer to foldout 5. The -60 generator set starts but shuts down as soon as S7 is released. what is the probable cause of this trouble?
- A.
  
  S10 was left on
- B.
  
  K17 is energizing
- C.
  
  K18 is de-energizing
- D.
  
  K16 is de-energizing
Correct Answer
C. K18 is de-energizing

Explanation
The probable cause of the trouble is that K18 is de-energizing. When K18 de-energizes, it can cause the generator set to shut down.

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33.

Refer to foldout 5. During operation of the -60, the engine rotates, but there is no combustion. What is the probable cause of this?
- A.
  
  K8
- B.
  
  L9
- C.
  
  S13
- D.
  
  S11
Correct Answer
D. S11

Explanation
The probable cause of the engine rotating without combustion during operation of the -60 could be a malfunction or failure in the fuel system. This could include issues such as a clogged fuel line, a faulty fuel pump, or a problem with the fuel injectors. Without the proper fuel supply, the engine is unable to ignite and create combustion, resulting in the observed behavior.

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34.

Refer to foldout 5. During your operational check of the -60 generator set the unit runs up to 80 percent and the ready to load light comes on. what do you check?
- A.
  
  Check to see if s10 was left on
- B.
  
  Nothing this is normal operation
- C.
  
  Check to see if the 95 percent centrifugal switch S14 is closed
- D.
  
  Check to see if the 95 percent centrifugal switch S14 is open
Correct Answer
C. Check to see if the 95 percent centrifugal switch S14 is closed

Explanation
During the operational check of the -60 generator set, if the unit runs up to 80 percent and the ready to load light comes on, it is necessary to check if the 95 percent centrifugal switch S14 is closed. The centrifugal switch plays a crucial role in the operation of the generator set, and if it is open instead of closed, it could indicate a malfunction or issue with the unit. Therefore, checking the status of the centrifugal switch is important in troubleshooting and ensuring the proper functioning of the generator set.

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35.

Refer to foldout 5. During operation an a -60 what happens is k25 IS ENERGIZED?
- A.
  
  The AC voltage drops off line
- B.
  
  Its contacts open and energizes K11A
- C.
  
  The undervoltage light illuminates
- D.
  
  The unit operates normally
Correct Answer
D. The unit operates normally

Explanation
When K25 is energized during operation, it means that the unit is functioning as intended and there are no issues or abnormalities. The other options, such as the AC voltage dropping off line, the contacts opening and energizing K11A, or the undervoltage light illuminating, do not indicate normal operation. Therefore, the correct answer is that the unit operates normally.

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36.

Refer to foldout 5. During operation of the -60 you close S3 but the AC contactor light does not come on. What is the probable cause of this trouble?
- A.
  
  CB1 open
- B.
  
  K11B energizes
- C.
  
  K11A de-energized
- D.
  
  K11 contacts C and D opened
Correct Answer
D. K11 contacts C and D opened

Explanation
The probable cause of the trouble is that the contacts C and D of K11 opened. This means that K11, which is a relay or a switch, is not functioning properly and is not allowing the flow of electricity to the AC contactor light. As a result, even when S3 is closed, the AC contactor light does not come on.

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37.

Refer to foldout 5. The DC voltmeter on a -60 fails to indicate during operation. What is the probable cause of this trouble?
- A.
  
  K6 is defective
- B.
  
  TR1 is defective
- C.
  
  R6 requires adjustment
- D.
  
  S4 is in the off position
Correct Answer
B. TR1 is defective

Explanation
The probable cause of the DC voltmeter on a -60 failing to indicate during operation is that TR1 is defective. TR1 refers to a component or transistor in the circuit that is responsible for amplifying or controlling the voltage. If TR1 is defective, it may not be functioning properly and therefore not allowing the voltmeter to indicate the correct voltage.

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38.

When a -60 generator is started what component de-energizes at 95 percent?
- A.
  
  Stater relay
- B.
  
  Ignition unit
- C.
  
  Ready to load light
- D.
  
  Acceleration limiter valve
Correct Answer
B. Ignition unit

Explanation
When a -60 generator is started, the ignition unit de-energizes at 95 percent. This means that the ignition unit stops receiving power and is turned off. The ignition unit is responsible for igniting the fuel in the generator, so once it de-energizes, the generator is already running and does not require the ignition unit anymore.

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39.

If the ignition control unit fails to operate on an -60 during operation what do you check?
- A.
  
  Fuel solenoid L1
- B.
  
  Fuel level relay K4
- C.
  
  Bleed air solenoid
- D.
  
  Oil pressure switch S11
Correct Answer
D. Oil pressure switch S11

Explanation
If the ignition control unit fails to operate on an -60 during operation, the first thing to check would be the oil pressure switch S11. This switch is responsible for sensing the oil pressure in the engine and sending a signal to the ignition control unit. If the oil pressure switch is faulty or not functioning properly, it can cause the ignition control unit to fail. Therefore, checking the oil pressure switch S11 is necessary in this situation.

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40.

Apparent power is measured in?
- A.
  
  Kilovolts
- B.
  
  Kilowatts
- C.
  
  Kilo-volt-amperes (KVA)
- D.
  
  Kilo-watt-amperes (KWA)
Correct Answer
C. Kilo-volt-amperes (KVA)

Explanation
Apparent power is measured in kilo-volt-amperes (KVA). Apparent power represents the total power in an AC circuit, including both the real power (measured in kilowatts) and the reactive power. It is a measure of the total power that is being supplied to the circuit, taking into account both the resistive and reactive components. KVA is commonly used in electrical engineering to determine the capacity of electrical equipment, such as transformers and generators, to handle the total power demand.

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41.

Refer to foldout 6. The AC cable is plugged into the -8 load bank input panel and both blower motors are turning. but nothing happens when you turn the shock load switches on. What is the probable cause of this trouble?
- A.
  
  K110 is energized
- B.
  
  K2 is de-energized
- C.
  
  CB1 is malfunctioning
- D.
  
  CR1 is malfunctioning
Correct Answer
D. CR1 is malfunctioning

Explanation
The probable cause of the trouble is that CR1 is malfunctioning. This is indicated by the fact that the AC cable is plugged in and the blower motors are turning, but nothing happens when the shock load switches are turned on. CR1 is likely responsible for controlling the flow of electricity to the load bank, and if it is malfunctioning, it may be preventing the load bank from receiving power and operating properly.

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42.

Refer to foldout 6. After you connect a -60 to the -8 load bank you notice one of the blower motors isnt working on the load bank. What is the probable cause of this trouble?
- A.
  
  CR1
- B.
  
  CR2
- C.
  
  S66 AND S67
- D.
  
  K3 energized
Correct Answer
B. CR2

Explanation
The probable cause of the blower motor not working on the load bank after connecting a -60 to the -8 load bank is CR2.

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43.

Refer to foldout 7. You are testing an alternating current (AC) generator and find B phase on the -8 load bank isnt working. What is the probable cause of this trouble?
- A.
  
  CB1
- B.
  
  CR1
- C.
  
  S56
- D.
  
  S1
Correct Answer
C. S56
44.

Refer to foldouts 6 and 7. If CB2 opens on an -8 load bank what effect doe it have on the load bank operation?
- A.
  
  Alternating Current (AC) load selections switches (S15 though S20) wont work
- B.
  
  Ac load selection switches (S15 through S20) work
- C.
  
  AC load selection switches (S9 through S14) work
- D.
  
  Blower motor B2 wont work
Correct Answer
A. Alternating Current (AC) load selections switches (S15 though S20) wont work

Explanation
When CB2 opens on an -8 load bank, it means that the circuit breaker CB2 has tripped or opened. This will result in the load bank not receiving power from the circuit connected to switches S15 through S20. As a result, the alternating current (AC) load selection switches S15 through S20 won't work, as they are not receiving power.

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45.

Refer to foldouts 6 and 7. The alternating current (AC) voltmeter on an -8 indicates 120 volts AC and the panel lights are working, but nothing happens when you turn the load selector switches on. What is the probable cause of this trouble?
- A.
  
  CB2 is on
- B.
  
  CB1 is open
- C.
  
  K110 is open
- D.
  
  S67 is closed
Correct Answer
C. K110 is open

Explanation
The probable cause of this trouble is that K110 is open. This means that the load selector switch is not allowing the current to flow through it, resulting in nothing happening when the switch is turned on.

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46.

What is the operating voltage of the blower motor and control relays on an -8 load bank?
- A.
  
  12 volts direct current (VDC)
- B.
  
  28 VDC
- C.
  
  120 volts alternating current (VAC)
- D.
  
  208 VAC
Correct Answer
B. 28 VDC

Explanation
The operating voltage of the blower motor and control relays on an -8 load bank is 28 VDC.

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47.

Refer to foldout 6. you are testing a direct current (DC) generator and notice the panel lights and blower motor (B2) on the -8 load bank are not working. Where would you start troubleshooting?
- A.
  
  K1
- B.
  
  K2
- C.
  
  CR2
- D.
  
  PT2
Correct Answer
B. K2

Explanation
To troubleshoot the issue with the panel lights and blower motor (B2) on the -8 load bank not working, you would start by checking K2.

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48.

Refer to fold out . On an -8 load bank, CR2 supplies 28 VDC to operate the panel lights, the wind switch assembly and the?
- A.
  
  AC voltmeter
- B.
  
  Transformer PT3
- C.
  
  Blower motor B1
- D.
  
  Blower motor B2
Correct Answer
D. Blower motor B2

Explanation
The correct answer is Blower motor B2. According to the information provided, CR2 supplies 28 VDC to operate the panel lights, the wind switch assembly, and the blower motor B2.

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Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

Current Version
Mar 20, 2023

Quiz Edited by
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Jun 11, 2013

Quiz Created by
Leone2110

2A672 Edit Code 6 40-85

41.) the portion of the voltage regulator that supplies exciter field voltage is transformer?

Refer to fold out 1. after performing an operational check of the -86d generator set you proceed to shut the unit down. after the generator stops you notice the engine on light continues to glow. what is the probable cause of this trouble?

Refer to fold out 1. during operation of the -86 you get no responce when you place s13 in the GENERATE position. a check of voltage at j8, terminal N shows 12 volts DC. whats the probable cause of this trouble?

Refer to foldout 1. You are operating an -86 at governed speed but voltage does not build up. What is the probable cause of this trouble?

During operation of the -86 what position do you place control switch S13 in to move the fuel rack and increase the engine speed to 2000 RPM?

Refer to foldout 1. During an operational check of the -86 the shut down solenoid energizes immediately after the engine run indicator illuminates. what is a probable cause of this trouble?

Refer to fold out 1. During operation of the -86 the low coolant light (DS50) illuminates. but the unit does not shut down. What is th probable cause of this trouble?

what component controls the strength of the -86 generator exciter field L2?

what component on the -86 generator is used to manually increase output voltage?

50.) refer to foldout 1. where is the best point to check volage to the -86 generator exciter field?

An -86 is operating and the alternationg current (AC) voltmeter is reading 200 volts AC on all three phases. what do you do?

What effect does a defective K4 relay have on the -86 generator output circuit?

While operating an -86 at governed speed you place S13 in the build up position and the undervoltage light comes on. What is the probable cause of this trouble?

You are driving on the flight line and you notice an -86 power unit with all the fault lights on. You try to reset S23 but the light stays on. what is the probable cause of this trouble?

When troubleshooting any electrical system you can locate a starting point by first finding the?

Which step of troubleshooting is considered the most difficult?

To test the load contactor relay K1, using test probes, in what position must the automatic-manual voltage control switch be placed in?

What component on the B809-A generator set fuel system distributes and delivers an accurate amount of fuel to the engine cylinders?

60.) What B809-A generator set speed control system component produces a frequency pulse train for engine speed reference?

What signal powers the regulator card output pulse sent to the exciter field of the B809-A generator?

What action occurs when the B809A generator set Alternating current (AC) card senses an AC supply fault?

What condition is sensed by the direct current (DC) card on the B809-A generator set ?

Refer to fold out 2. While operating a B809A generator what switch is closed to provide potential to the exciter field?

Refer to folout 2. During high voltage operation of the B809A generator set , what action occurs to prevent the direct current (DC) from closing?

If you have a loss of residual magnetism in the exciter field poles, what should you do?

What gas turbine engine component is specifically designed to break if the engine locks up?

During the operation of a -60A generator set you noticed the exhaust gas temperature is excessively high. what is the probable cause of this trouble?

What component of the -60 gas turbine engine lubrication system prevents engine operation if oil pressure is too low?

While you are operating the -60 generator set, you turn the bleed air switch to ON and the engine speed drops to 98 percent. What is happening in the governor to bring the engine speed up to 100 percent?

What section of the -60 gas turbine engine load control valve controls the opening time?

Refer to foldout 5. The -60 generator set starts but shuts down as soon as S7 is released. what is the probable cause of this trouble?

Refer to foldout 5. During operation of the -60, the engine rotates, but there is no combustion. What is the probable cause of this?

Refer to foldout 5. During your operational check of the -60 generator set the unit runs up to 80 percent and the ready to load light comes on. what do you check?

Refer to foldout 5. During operation an a -60 what happens is k25 IS ENERGIZED?

Refer to foldout 5. During operation of the -60 you close S3 but the AC contactor light does not come on. What is the probable cause of this trouble?

Refer to foldout 5. The DC voltmeter on a -60 fails to indicate during operation. What is the probable cause of this trouble?

When a -60 generator is started what component de-energizes at 95 percent?

If the ignition control unit fails to operate on an -60 during operation what do you check?

Apparent power is measured in?

Refer to foldout 6. The AC cable is plugged into the -8 load bank input panel and both blower motors are turning. but nothing happens when you turn the shock load switches on. What is the probable cause of this trouble?

Refer to foldout 6. After you connect a -60 to the -8 load bank you notice one of the blower motors isnt working on the load bank. What is the probable cause of this trouble?

Refer to foldout 7. You are testing an alternating current (AC) generator and find B phase on the -8 load bank isnt working. What is the probable cause of this trouble?

Refer to foldouts 6 and 7. If CB2 opens on an -8 load bank what effect doe it have on the load bank operation?

Refer to foldouts 6 and 7. The alternating current (AC) voltmeter on an -8 indicates 120 volts AC and the panel lights are working, but nothing happens when you turn the load selector switches on. What is the probable cause of this trouble?

What is the operating voltage of the blower motor and control relays on an -8 load bank?

Refer to foldout 6. you are testing a direct current (DC) generator and notice the panel lights and blower motor (B2) on the -8 load bank are not working. Where would you start troubleshooting?

Refer to fold out . On an -8 load bank, CR2 supplies 28 VDC to operate the panel lights, the wind switch assembly and the?