Electrical System, Fire Protection And Detection System

Reviewed by Editorial Team
The ProProfs editorial team is comprised of experienced subject matter experts. They've collectively created over 10,000 quizzes and lessons, serving over 100 million users. Our team includes in-house content moderators and subject matter experts, as well as a global network of rigorously trained contributors. All adhere to our comprehensive editorial guidelines, ensuring the delivery of high-quality content.
Learn about Our Editorial Process
| By SasjaZ
S
SasjaZ
Community Contributor
Quizzes Created: 4 | Total Attempts: 825
| Attempts: 232 | Questions: 23
Please wait...
Question 1 / 23
0 %
0/100
Score 0/100
1. With AC power on the bus bars, no system faults, and OVHT DET switches in NORMAL, selecting OVHT/FIRE on the test switch will illuminate wich lights:

Explanation

When the AC power is on the bus bars, there are no system faults, and the OVHT DET switches are in NORMAL, selecting OVHT/FIRE on the test switch will illuminate several lights. These include the Master FIRE WARNING lights, ENG1+ENG2 and APU fire switch lights, and WHEEL WELL FIRE light. Additionally, the MASTER caution lights, OVHT/DET annunciator, and the ENG+ENG OVERHEAT lights will also be illuminated.

Submit
Please wait...
About This Quiz
Aircraft Maintenance Quizzes & Trivia

The electrical system for an airliner is a very sensitive subject and a mechanic must ensure there are no possibilities for a fire occurring due to electrical wiring problems, as it can be catastrophic. The quiz below is designed to test out how much you know about wiring a Boeing... see more737. Give it a shot! see less

Personalize your quiz and earn a certificate with your name on it!
2. In flight, what does illumination of the "TR UNIT" light indicate:

Explanation

The illumination of the "TR UNIT" light indicates that either TRU1 or TRU2 and TRU3 have failed.

Submit
3. What are the normal AC volts and frequancy for the 2 engine driven generators and the APU generator:

Explanation

The normal AC volts and frequency for the 2 engine driven generators and the APU generator are 115 v (+/- 5 v) and 400Hz (+/- 10 Hz).

Submit
4. The engine fire warning switch lock mechanism is automatically unlocked when:

Explanation

When either the fire warning or overheat light illuminates, it indicates a potential issue with the engine. In such a situation, the engine fire warning switch lock mechanism is automatically unlocked to allow the pilot to take immediate action and address the problem. This ensures that the pilot has the ability to respond quickly and effectively to any engine-related emergencies while in flight.

Submit
5. After a generator drive disconnect, can the drive be re-engaged:

Explanation

After a generator drive disconnect, the drive can only be re-engaged on the ground by maintenance. This means that the drive cannot be re-engaged while the aircraft is in flight. The maintenance crew is responsible for addressing any issues with the generator drive and ensuring that it is properly re-engaged before the aircraft can continue operating. The flight crew does not have the capability to re-engage the drive themselves.

Submit
6. When the extinguisher test switch is held in the 1 or 2 position, 3 green lights should illuminate. What does this indicate:

Explanation

The correct answer indicates that when the extinguisher test switch is held in the 1 or 2 position, 3 green lights illuminate, indicating that the associated bottle discharge circuits for all 3 extinguisher bottles are normal. This means that the circuits are functioning properly and there are no issues with the discharge of the extinguisher bottles.

Submit
7. What does illumination of the "GND Power Available" light indicate:

Explanation

The illumination of the "GND Power Available" light indicates that AC ground power is connected and meets airplane power quality standards. This means that the aircraft is receiving a reliable and high-quality power supply from an external source.

Submit
8. The power source for the APU fire extinguishing system is the:

Explanation

The correct answer is the hot battery bus (28v DC). The hot battery bus is a direct current (DC) power source that provides electrical power to various systems on the aircraft. The APU fire extinguishing system is one of these systems and it relies on the hot battery bus to supply power for its operation. This ensures that the APU fire extinguishing system has a reliable power source to effectively extinguish any fires that may occur in the APU.

Submit
9. In flight, the output from no1 IDG fails. How is power AC transfer bus 1 restored:

Explanation

When the output from no1 IDG fails during a flight, power AC transfer bus 1 is automatically restored by transferring power from AC transfer bus 2 via the AC tie bus. This is done automatically without any manual intervention or reliance on the battery.

Submit
10. If a malfunction in one fire loop occurs, with the OVHT DET switch in the normal position, do you still have detection availiable:

Explanation

If a malfunction occurs in one fire loop with the OVHT DET switch in the normal position, the system is still available for the rest of the flight. This is because the defective loop is automatically removed from the system, and the remaining loop continues to function as a single loop detector.

Submit
11. When will the switched hot battery bus be powered by a functional battery:

Explanation

The switched hot battery bus will be powered by a functional battery when the battery switch is selected to ON. This means that the battery is connected to the electrical system and is providing power to the switched hot battery bus.

Submit
12. The aircraft is on the ground on stand, with engines running, and both generators on line. External power is available. What will positioning the ground power switch to ON do:

Explanation

Positioning the ground power switch to ON in this scenario will trip both engine generators and connect external power to the transfer buses. This means that the aircraft will be disconnected from its own generators and rely solely on the external power source. Additionally, the external power will be connected to the transfer buses, allowing it to power the necessary systems and equipment on the aircraft.

Submit
13. Where does TRU no 2 receive its AC power from:

Explanation

TRU no 2 receives its AC power from AC transfer bus 2. This means that the power is transferred from the AC transfer bus 2 to TRU no 2 for its operation.

Submit
14. DC power is supplied by 3 TR units. What is the output Voltage:

Explanation

The correct answer is 28 volts DC. This is because the question states that DC power is supplied by 3 TR units. DC stands for direct current, which means that the voltage is constant and flows in one direction. Therefore, the output voltage would also be DC. The given answer of 28 volts DC aligns with the information provided in the question.

Submit
15. Following the loss of an IDG, with a single generator operating, which loads are initially shed:

Explanation

When an Integrated Drive Generator (IDG) is lost and only one generator is operating, the loads that are initially shed include Galley bus A + B (shed from transfer bus 2). This means that the power supply to Galley bus A and Galley bus B is disconnected from transfer bus 2. This shedding of loads is necessary to balance the power supply and demand in the system and prevent overloading of the remaining generator.

Submit
16. The power source for the ENG Overheat and Fire Protection detection system is:

Explanation

The power source for the ENG Overheat and Fire Protection detection system is the Battery bus (28v DC). This means that the system is powered by the aircraft's battery, which provides a direct current of 28 volts. The battery bus is a common source of power for various systems in an aircraft, including critical systems like fire detection and protection. It ensures that the detection system has a reliable and independent power source to operate effectively in case of an engine overheat or fire situation.

Submit
17. How is the main battery charger powered:

Explanation

The main battery charger is powered by the AC ground service bus 2.

Submit
18. With the standby power switch in the AUTO position, what will cause automatic switching to the Alternate power source:

Explanation

When the standby power switch is in the AUTO position, the automatic switching to the alternate power source will occur if either AC transfer bus 1 or DC bus 1 loses power.

Submit
19. Illumination of the FAULT light on the Overheat/Fire detection panel indicates what:

Explanation

not-available-via-ai

Submit
20. What is the battery voltage:

Explanation

The correct answer is 24 volts DC. This is because the given information states that the battery voltage is 24 volts DC. Additionally, the range is specified as 22 to 30 volts, which falls within the given voltage. Lastly, it is mentioned that the battery supplies standby power for 30 minutes, which matches the information provided.

Submit
21. What does the illumination of the "elec" light on the electrical panel indicate:

Explanation

The illumination of the "elec" light on the electrical panel indicates that a fault has been detected in the DC or standby power system. This means that there is an issue with either the DC power system or the standby power system, which could potentially cause a disruption in the electrical supply. It is important to address this fault promptly to ensure the proper functioning of the power system.

Submit
22. With the OVHT/DET switch in the normal position, and both loobs servicable, when will engine fire warning be activated:

Explanation

When both loops detect a fire condition, the engine fire warning will be activated. This means that both fire detection loops must independently detect a fire in order for the warning to be triggered. If only one loop detects a fire or an overheat condition, the warning will not be activated. Similarly, if both loops detect an overheat condition without a fire, the warning will not be activated.

Submit
23. What is the normal supply to the battery bus:

Explanation

The normal supply to the battery bus is provided by the AC ground service bus 1.

Submit
View My Results

Quiz Review Timeline (Updated): Mar 21, 2023 +

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

  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Feb 11, 2012
    Quiz Created by
    SasjaZ
Cancel
  • All
    All (23)
  • Unanswered
    Unanswered ()
  • Answered
    Answered ()
With AC power on the bus bars, no system faults, and OVHT DET switches...
In flight, what does illumination of the "TR UNIT" light indicate:
What are the normal AC volts and frequancy for the 2 engine driven...
The engine fire warning switch lock mechanism is automatically...
After a generator drive disconnect, can the drive be re-engaged:
When the extinguisher test switch is held in the 1 or 2 position, 3...
What does illumination of the "GND Power Available" light indicate:
The power source for the APU fire extinguishing system is the:
In flight, the output from no1 IDG fails. How is power AC transfer bus...
If a malfunction in one fire loop occurs, with the OVHT DET switch in...
When will the switched hot battery bus be powered by a functional...
The aircraft is on the ground on stand, with engines running, and both...
Where does TRU no 2 receive its AC power from:
DC power is supplied by 3 TR units. What is the output Voltage:
Following the loss of an IDG, with a single generator operating, which...
The power source for the ENG Overheat and Fire Protection detection...
How is the main battery charger powered:
With the standby power switch in the AUTO position, what will cause...
Illumination of the FAULT light on the Overheat/Fire detection panel...
What is the battery voltage:
What does the illumination of the "elec" light on the electrical panel...
With the OVHT/DET switch in the normal position, and both loobs...
What is the normal supply to the battery bus:
Alert!

Advertisement