J Model APU Test
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Fuel for APU operation comes from which tank
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#4
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#3
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#2
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#1
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The 'J Model APU Test' assesses knowledge crucial for operating the Auxiliary Power Unit (APU) in aircraft. It covers minimum fuel requirements, maximum heat limits on start, generator activation protocols, communication essentials, and bleed down test parameters.
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- 2.
From what pressure to what pressure is the bleed down test timed?
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45-30 PSI
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30-15 PSI
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15-0 PSI
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60-45 PSI
Correct Answer
A. 30-15 PSIExplanation
The bleed down test is timed from 30-15 PSI. This means that the test is performed and the time it takes for the pressure to decrease from 30 PSI to 15 PSI is measured. This test is commonly used to check for any leaks or issues in a system, as a significant drop in pressure within this range could indicate a problem.Rate this question:
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- 3.
How many people are required to operate the APU?
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1
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2
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3
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4
Correct Answer
A. 2Explanation
Two people are required to operate the APU.Rate this question:
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- 4.
What is the minimum amount of fuel that is necessary to for APU operation
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2500
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1000
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1500
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2000
Correct Answer
A. 2000Explanation
The correct answer is 2000. This means that 2000 units of fuel is the minimum amount required for APU operation.Rate this question:
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- 5.
What is the maximum heat in degrees upon APU start?
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675
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680
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685
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690
Correct Answer
A. 680Explanation
Upon APU start, the maximum heat in degrees is 680.Rate this question:
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- 6.
When does the APU starter disengage
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50% or 90 seconds
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25% or 60 seconds
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40% or 75 seconds
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75% or 90 seconds
Correct Answer
A. 50% or 90 secondsExplanation
The APU starter disengages when the APU reaches 50% of its maximum speed or after running for 90 seconds. This is likely a safety measure to prevent damage to the APU and ensure that it is properly started and running before disengaging the starter.Rate this question:
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- 7.
When do you place the APU alarm switch to on
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Prior to APU start
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After APU start
Correct Answer
A. Prior to APU startExplanation
The APU alarm switch should be placed to "on" prior to APU start. This is because the APU alarm system is designed to alert the crew in case of any abnormal conditions or malfunctions during the APU start process. By turning the APU alarm switch to "on" before starting the APU, the crew ensures that they will be immediately notified of any issues that may arise, allowing them to take appropriate action and prevent any potential damage or hazards.Rate this question:
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- 8.
What is normal operating RPM in percentage?
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90-105
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98-105
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98-110
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90-110
Correct Answer
A. 98-105Explanation
The normal operating RPM in percentage is between 98-105. This range indicates the typical range at which a machine or engine should operate under normal conditions. Operating within this range ensures optimal performance and prevents potential damage or wear on the equipment.Rate this question:
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- 9.
?What is the minimum time to pass a bleed down test?
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24
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21
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23
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22
Correct Answer
A. 22Explanation
The minimum time to pass a bleed down test is 22.Rate this question:
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- 10.
Can you operate APU with an INOP door?
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Yes
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No
Correct Answer
A. YesExplanation
The APU (Auxiliary Power Unit) is a device used to provide power to an aircraft when the main engines are not running. The INOP (inoperative) door refers to a door that is not functioning properly or is disabled. In this context, the question is asking if it is possible to operate the APU even if the door is inoperative. The correct answer is "Yes" because the operation of the APU is independent of the status of the door.Rate this question:
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- 11.
What is the minimum bleed air pressure for a bleed down test
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30 PSI
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45 PSI
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50 PSI
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60 PSI
Correct Answer
A. 30 PSIExplanation
The minimum bleed air pressure for a bleed down test is 30 PSI. This means that the test should be conducted with a minimum air pressure of 30 pounds per square inch.Rate this question:
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- 12.
When is a mechanic in the flight deck to monitor APU fire warning system
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Any time the APU is running
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Never
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Any time there is power on the aircraft
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Any time the engines are running
Correct Answer
A. Any time the APU is runningExplanation
A mechanic is required to be in the flight deck to monitor the APU fire warning system whenever the APU is running. This is because the APU (Auxiliary Power Unit) is responsible for providing power to the aircraft when the main engines are not running. Since the APU is a potential source of fire, it is crucial to have a mechanic present in the flight deck to monitor the APU fire warning system and take immediate action in case of any fire-related issues.Rate this question:
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- 13.
Oil tank capacity for the APU is ___ and the total system capacity is ____ (In quarts)
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5, 6
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4, 7
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4, 6
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5, 7
Correct Answer
A. 4, 6Explanation
The oil tank capacity for the APU is 4 quarts and the total system capacity is 6 quarts.Rate this question:
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- 14.
Is it safe to operate the APU if there is fuel coming out of the Purge Valve?
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Yes
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No
Correct Answer
A. NoExplanation
If there is fuel coming out of the Purge Valve, it is not safe to operate the APU. Fuel leakage can lead to a fire hazard, causing potential damage to the aircraft and endangering the passengers and crew. It is essential to address the fuel leakage issue and resolve it before operating the APU to ensure the safety of the aircraft.Rate this question:
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- 15.
What is the minimum voltage from battery to start from battery?
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20
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21
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22
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24
Correct Answer
A. 22Explanation
The minimum voltage required to start from a battery is 22 volts. This means that the battery needs to have at least 22 volts of power in order to successfully start a device or engine. Voltages lower than 22 volts may not provide enough power to initiate the starting process.Rate this question:
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- 16.
If DC volt meter is readable, but flickering, is displayed voltage correct?
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Yes
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No
Correct Answer
A. YesExplanation
If the DC volt meter is readable but flickering, it indicates that the voltage is fluctuating rapidly. However, it does not necessarily mean that the displayed voltage is incorrect. The flickering could be due to variations in the voltage source or interference in the meter's display. Therefore, the displayed voltage can still be considered correct, despite the flickering.Rate this question:
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- 17.
Is there a wait time for APU generator on with no ACAWS messages?
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No
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Yes
Correct Answer
A. NoExplanation
There is no wait time for the APU generator to be on with no ACAWS messages.Rate this question:
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- 18.
How long must you wait after the 3th failed start?
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As soon as the turbine ceases rotation
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60 minutes
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120 minutes
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30 minutes
Correct Answer
A. 60 minutesExplanation
After the 3rd failed start, you must wait for 60 minutes. This implies that there is a requirement to wait for a specific duration before attempting another start after multiple failed attempts. The duration of 60 minutes is given as the correct answer.Rate this question:
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- 19.
Which of these are the positions for the APU start panel
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STOP
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RUN
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IDLE
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START
Correct Answer(s)
A. STOP
A. RUN
A. STARTExplanation
The correct answer is STOP, RUN, START. These are the positions for the APU start panel. The APU (Auxiliary Power Unit) is a device in an aircraft that provides power for various functions when the main engines are not running. The APU start panel allows the pilot to control the starting and stopping of the APU. The STOP position is used to shut down the APU, the RUN position is used to keep the APU running, and the START position is used to initiate the start-up process of the APU.Rate this question:
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- 20.
If propellers rotate when bleed air is applied, what must you do?
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Nothing
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Switch off bleed air
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Panic
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Emergency procedures
Correct Answer
A. Switch off bleed airExplanation
When propellers rotate when bleed air is applied, it indicates a potential issue with the bleed air system. Bleed air is used to power various aircraft systems, including the propellers. If the propellers are rotating unexpectedly, it suggests that the bleed air is causing an unintended activation of the propellers. To prevent any further damage or potential accidents, the correct action would be to switch off the bleed air. This will stop the flow of bleed air and prevent any further rotation of the propellers.Rate this question:
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- 21.
How many emergency exits are there on a 1C-130J?
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7
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9
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11
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10
Correct Answer
A. 11Explanation
A 1C-130J aircraft has 11 emergency exits.Rate this question:
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- 22.
If below freezing, how long must you wait for APU to stabilize to apply bleed air
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1 minute
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2 minutes
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3 minutes
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4 minutes
Correct Answer
A. 4 minutesExplanation
When the temperature is below freezing, it is necessary to wait for 4 minutes for the APU (Auxiliary Power Unit) to stabilize before applying bleed air. This waiting period allows the APU to reach a stable and consistent temperature, ensuring that the bleed air is at the appropriate temperature and pressure for safe and efficient operation.Rate this question:
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- 23.
Is it safe to operate the APU if frost is on the inlet screen?
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No
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Yes
Correct Answer
A. YesExplanation
It is safe to operate the APU if frost is on the inlet screen because the frost does not pose any immediate danger or risk to the operation of the APU. The APU is designed to function properly even with frost on the inlet screen, and it will not cause any significant impact on its performance or safety. However, it is always recommended to remove the frost before operating the APU to ensure optimal efficiency and prevent any potential issues in the long run.Rate this question:
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- 24.
Which communication line must you turn on if starting from battery?
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Get Home Radio
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VHF
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Get Home Radio & VHF
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Main Radio
Correct Answer
A. Get Home RadioExplanation
If starting from the battery, you must turn on the "Get Home Radio" communication line.Rate this question:
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- 25.
Which position do you place the bleed down switches to during bleed down?
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Open
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Closed
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Auto
Correct Answer
A. OpenExplanation
During the bleed down process, the bleed down switches should be placed in the "Open" position. This allows for the release of pressure from the system, allowing it to depressurize and bleed off any excess air or fluid. Placing the switches in the "Closed" position would prevent the release of pressure, while placing them in the "Auto" position would depend on the system's automatic control for the bleed down process.Rate this question:
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- 26.
Cold weather operation guidance comes from which Job Guide
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09JG-10-1
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12JG-10-1
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12JG-20-1
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12JG-30-1
Correct Answer
A. 12JG-30-1Explanation
The correct answer is 12JG-30-1. This job guide provides guidance for cold weather operations.Rate this question:
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- 27.
If any fuel components have been replaced, how many starts may be required?
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1
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2
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3
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4
Correct Answer
A. 2Explanation
If any fuel components have been replaced, it may require two starts. This suggests that after replacing the fuel components, the engine may need to be started twice in order to ensure that the new components are functioning properly and that there are no issues with the fuel system.Rate this question:
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- 28.
If starting from battery, which of these systems do you check?
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Fire detection
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Smoke detection
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Fire and Smoke detection
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None of these
Correct Answer
A. None of theseExplanation
Since the question asks which system to check starting from the battery, the correct answer is "None of these." This implies that there are other systems or components that need to be checked before or instead of the fire detection, smoke detection, or fire and smoke detection systems. The question does not provide any specific information about what these other systems or components might be, but it suggests that they should be prioritized over the listed options.Rate this question:
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- 29.
How long must you wait if DC power is interrupted to restart the APU
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1 minute
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2 minutes
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3 minutes
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4 minutes
Correct Answer
A. 4 minutesExplanation
If DC power is interrupted, you must wait for 4 minutes to restart the APU.Rate this question:
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- 30.
Which of the following is NOT a function of an Auxiliary Power Unit (APU) on an aircraft?
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Providing air conditioning and cabin pressurization on the ground
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Increasing the aircraft's thrust during takeoff
Correct Answer
A. Increasing the aircraft's thrust during takeoffExplanation
While an APU provides essential power for various aircraft functions, it does not contribute to the aircraft's thrust during takeoff. That role is specifically reserved for the main engines. The APU's primary functions are to supply power to aircraft systems on the ground, start the main engines, and provide air conditioning and cabin pressurization when the main engines are not running.Rate this question:
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Current Version
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Nov 04, 2024Quiz Edited by
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Jun 06, 2014Quiz Created by
C0mbatChris
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