2a352h Volume 3 Chapter 1
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2A352H Volume 3 F-22 E&E Systems Self test questions
- 1.
What are the three generators that make up a brushless ac generator?
- A.
PMG armature, exciter field, and main armature windings
- B.
RBC, USS, CSD
- C.
PMG, exciter, and main
- D.
PMG, RBC, exciter
Correct Answer
C. PMG, exciter, and mainExplanation
The three generators that make up a brushless ac generator are the PMG (Permanent Magnet Generator), the exciter, and the main armature windings. The PMG generates a stable and constant voltage to power the exciter, which in turn produces the magnetic field required for the main armature windings to generate the desired output voltage. This configuration eliminates the need for brushes and slip rings, making the generator more reliable and requiring less maintenance.Rate this question:
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- 2.
If the CSD temperature rises to an overheat condition, what should be done to prevent further?
- A.
Decrease CSD speed
- B.
Dissconnect the CSD
- C.
Increase CSD speed
- D.
Reconnect the CSD
Correct Answer
B. Dissconnect the CSDExplanation
If the CSD temperature rises to an overheat condition, the correct action to prevent further damage would be to disconnect the CSD. Disconnecting the CSD (Constant Speed Drive) would interrupt the power supply to the system, stopping any further heat generation and preventing potential damage to the components. This would allow the system to cool down and prevent any further overheating.Rate this question:
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- 3.
What three types of GCU protection circuits are used only during parallel operation?
- A.
Voltage regulation, over and under current, differential fault
- B.
Neutral current, over and under current, unbalenced current
- C.
Differential fault, neutral current, RBC
- D.
RBC, neutral current, and unbalenced current
Correct Answer
D. RBC, neutral current, and unbalenced currentExplanation
The three types of GCU protection circuits used only during parallel operation are RBC (Reverse Blocking Contactor), neutral current, and unbalanced current. These protection circuits are specifically designed to monitor and control the flow of current in parallel operation, ensuring that the system remains balanced and protected against faults. The RBC circuit is responsible for preventing reverse current flow, while the neutral current circuit monitors the current flowing through the neutral conductor. The unbalanced current circuit detects any imbalances in the current distribution among the parallel circuits.Rate this question:
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- 4.
What three internal components make up TR?
- A.
Cooling fan, ac inverters, and diode bank
- B.
Cooling fan, step-down transformer, and diode bank
- C.
Step-down transformer, ac inverters, and diode bank
- D.
Ac inverters, voltage regulator, diode bank
Correct Answer
B. Cooling fan, step-down transformer, and diode bankExplanation
The three internal components that make up TR are a cooling fan, a step-down transformer, and a diode bank. These components are essential for the proper functioning of TR. The cooling fan helps to regulate the temperature and prevent overheating. The step-down transformer is responsible for reducing the voltage to a suitable level. The diode bank is used to convert the alternating current (AC) to direct current (DC) for further use.Rate this question:
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- 5.
What voltage is required to energize the coil of the voltage relay inside an RCR?
- A.
Any voltage below 22 vdc
- B.
Any voltage below 22 vac
- C.
Any voltage above 22 vdc
- D.
Any voltage above 22 vac
Correct Answer
C. Any voltage above 22 vdcExplanation
The correct answer is "Any voltage above 22 vdc". This means that in order to energize the coil of the voltage relay inside an RCR, the voltage applied should be higher than 22 volts direct current. Voltages below 22 vdc or any voltage in alternate current (vac) would not be sufficient to energize the coil.Rate this question:
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- 6.
What is the primary operating power on the F-22 aircraft?
- A.
270 vdc
- B.
270 vac
- C.
115 vdc
- D.
115 vac
Correct Answer
A. 270 vdcExplanation
The primary operating power on the F-22 aircraft is 270 vdc. This means that the aircraft operates on a direct current (dc) power supply with a voltage of 270 volts.Rate this question:
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- 7.
How much power is available to the F-22 when the stored energy system is the only source of power to auxiliary generator?
- A.
5 kW
- B.
10kW
- C.
15kW
- D.
20kW
Correct Answer
A. 5 kWExplanation
The available power to the F-22 when the stored energy system is the only source of power to the auxiliary generator is 5 kW.Rate this question:
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- 8.
How many inverter regulators are part of the flight control system power?
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer
C. 3Explanation
There are three inverter regulators that are part of the flight control system power.Rate this question:
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- 9.
Which inverter transmits control signals to PDC 6?
- A.
Inverter 1
- B.
Inverter 2
- C.
Inverter 3
- D.
Inverter 4
Correct Answer
B. Inverter 2Explanation
Inverter 2 transmits control signals to PDC 6.Rate this question:
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- 10.
What type of battery is used on the F-22 aircraft?
- A.
Non sealed maintenance free 28 vdc NiCad battery.
- B.
Sealed maintenance free 28 vdc NiCad battery.
- C.
Non sealed maintenance free 28 vdc Lithium battery.
- D.
Sealed maintenance free 28 vdc Lithium battery.
Correct Answer
B. Sealed maintenance free 28 vdc NiCad battery.Explanation
The F-22 aircraft uses a sealed maintenance free 28 vdc NiCad battery. This type of battery does not require regular maintenance and is sealed to prevent leakage. It operates at a voltage of 28 vdc. NiCad stands for nickel-cadmium, which is the type of battery chemistry used in this battery.Rate this question:
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- 11.
What external power in applied to the F-22 aircraft?
- A.
115 vac and 28 vdc.
- B.
115 vac and 28 vac.
- C.
270 vac and 28 vdc.
- D.
270 vdc and 28 vdc.
Correct Answer
D. 270 vdc and 28 vdc.Explanation
The external power applied to the F-22 aircraft consists of 270 vdc and 28 vdc. This means that the aircraft requires a direct current (dc) power supply of 270 volts and 28 volts.Rate this question:
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- 12.
What F-22 component provides functions to prevent ground power that is not in compliance with electrical power standards from being applied to the aircraft?
- A.
The main GCU
- B.
The standby GCU
- C.
The auxiliary GCU
- D.
The backup GCU
Correct Answer
C. The auxiliary GCUExplanation
The auxiliary GCU (Generator Control Unit) provides functions to prevent ground power that is not in compliance with electrical power standards from being applied to the aircraft. It acts as a backup system to ensure that only the appropriate and safe electrical power is supplied to the F-22 aircraft.Rate this question:
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- 13.
What components comprise the F-22 emergency power generation subsystem?
- A.
The auxiliary generator, the auxiliary GCU, and dc contactor K701
- B.
The auxiliary generator, the auxiliary GCU, and dc contactor K702
- C.
The auxiliary generator, the auxiliary GCU, and dc contactor K703
- D.
The auxiliary generator, the auxiliary GCU, and dc contactor K704
Correct Answer
D. The auxiliary generator, the auxiliary GCU, and dc contactor K704Explanation
The F-22 emergency power generation subsystem consists of the auxiliary generator, the auxiliary GCU, and dc contactor K704. These components work together to provide emergency power in case of a power failure or other electrical issues. The auxiliary generator generates the power, the auxiliary GCU controls and regulates the power, and dc contactor K704 helps to distribute the power to the necessary systems.Rate this question:
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- 14.
What determines which loads may be powered if power is limited?
- A.
How much power is available.
- B.
The electrical power mode.
- C.
Which generators are online.
- D.
Nothing
Correct Answer
B. The electrical power mode.Explanation
The electrical power mode determines which loads may be powered if power is limited. Different power modes prioritize certain loads over others based on their importance or criticality. For example, in a power-saving mode, non-essential loads may be temporarily turned off to conserve power. Therefore, the electrical power mode plays a crucial role in determining which loads can be powered when power is limited.Rate this question:
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- 15.
Which mode of the external power state can be controlled using the PMA?
- A.
Battery fill-in mode.
- B.
Emergency return-to-base mode.
- C.
Maintenance mode.
- D.
Ground idle mode.
Correct Answer
C. Maintenance mode.Explanation
The PMA (Power Management Annunciator) is a system that allows for the control and monitoring of various power states in an aircraft. Among these power states, the mode that can be controlled using the PMA is the maintenance mode. This mode is typically used during maintenance operations when the aircraft is on the ground. It allows for the activation of specific systems and functions needed for maintenance tasks, while other non-essential systems can be deactivated. This helps in conserving power and ensuring safety during maintenance operations.Rate this question:
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- 16.
How many caution and advisory messages are used to display electrical power system status on?
- A.
21 ( 8 countdown and 13 advisory ).
- B.
21 ( 6 countdown and 15 advisory ).
- C.
24 ( 8 countdown and 16 advisory ).
- D.
21 ( 4 countdown and 17 advisory ).
Correct Answer
A. 21 ( 8 countdown and 13 advisory ).Explanation
There are a total of 21 caution and advisory messages used to display the electrical power system status. Out of these, 8 messages are countdown messages and 13 messages are advisory messages.Rate this question:
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