CDC 2A651 Volume 3 Engine Systems (Q 35-50
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Questions and Answers
- 1.
Approximately how many GPM does the AE2100D3 PUAD lube and scavenge pump provide at engine PTO?
- A.
3.
- B.
5.
- C.
7.
- D.
9.
Correct Answer
B. 5.Explanation
The AE2100D3 PUAD lube and scavenge pump provides approximately 5 GPM at engine PTO.Rate this question:
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- 2.
What AE2100D3 component drives the PGB lube and scavenge pump?
- A.
Alternator stator.
- B.
PGB.
- C.
PUAD.
- D.
GMAD.
Correct Answer
D. GMAD.Explanation
The GMAD (Gearbox Mounted Accessory Drive) is the component that drives the PGB (Power Gearbox) lube and scavenge pump. This pump is responsible for lubricating and removing oil from the power gearbox, ensuring proper functioning and longevity of the system. The Alternator stator, PGB, and PUAD (Power Unit Accessory Drive) are not directly involved in driving the PGB lube and scavenge pump.Rate this question:
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- 3.
Which type of oil pump is used on the T56 engine?
- A.
Gear.
- B.
Float.
- C.
Gerotor.
- D.
Centrifugal
Correct Answer
A. Gear.Explanation
The correct answer is "Gear." The T56 engine uses a gear-type oil pump. This type of pump utilizes gears to create suction and draw oil into the pump, which is then distributed to lubricate various engine components. Gear pumps are known for their durability and reliability, making them a common choice in many engines, including the T56.Rate this question:
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- 4.
The amount of ram air passing through the oil cooler core is regulated by the
- A.
Thermostat.
- B.
Flap actuator.
- C.
Size of the core.
- D.
Regulating valve.
Correct Answer
B. Flap actuator.Explanation
The correct answer is flap actuator. The flap actuator is responsible for regulating the amount of ram air passing through the oil cooler core. It controls the position of the flap, which in turn controls the airflow. By adjusting the position of the flap, the flap actuator can increase or decrease the amount of air passing through the oil cooler core, helping to regulate the temperature of the oil and prevent overheating.Rate this question:
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- 5.
Bleed air flowing through which component increases airflow through the cooler?
- A.
Flap actuator.
- B.
Oil cooler flap.
- C.
Augmentation valve.
- D.
Augmentation ejector.
Correct Answer
C. Augmentation valve.Explanation
The augmentation valve is responsible for increasing the airflow through the cooler. It is a component that regulates the airflow and allows more air to pass through, which helps in cooling the system efficiently. The flap actuator, oil cooler flap, and augmentation ejector do not have a direct role in increasing the airflow through the cooler.Rate this question:
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- 6.
The valve that allows fluid to flow in only one direction is the
- A.
Check.
- B.
Relief.
- C.
Bypass.
- D.
Pressurizing.
Correct Answer
A. Check.Explanation
The valve that allows fluid to flow in only one direction is called a check valve. This type of valve is designed to prevent backflow or reverse flow of fluid, ensuring that it can only flow in one direction. It typically consists of a flap or a ball that opens when the fluid flows in the desired direction and closes to block the flow in the opposite direction. Check valves are commonly used in plumbing systems, water pumps, and various industrial applications to maintain the proper flow direction and prevent any potential damage or contamination.Rate this question:
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- 7.
In the power unit oil system ,the dual-port oil jet mounted on the front side of the compressor air inlet housing is used to lubricate the
- A.
Mid and center sleeve bearings.
- B.
Torquemeter and compressor front bearings.
- C.
Front and rear sides of the compressor rear bearing.
- D.
Front and rear sides of the compressor front bearing.
Correct Answer
A. Mid and center sleeve bearings.Explanation
The dual-port oil jet mounted on the front side of the compressor air inlet housing is used to lubricate the mid and center sleeve bearings. This means that the oil jet is responsible for providing lubrication to these specific bearings, which are located in the power unit oil system.Rate this question:
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- 8.
The power section and RGB oil systems are joined together at the
- A.
Fuel heater and strainer.
- B.
External scavenge oil filter.
- C.
External scavenge oil pump.
- D.
Scavenge element of the main pump.
Correct Answer
B. External scavenge oil filter.Explanation
The power section and RGB oil systems are joined together at the external scavenge oil filter. This filter is responsible for removing any contaminants or impurities from the oil before it is circulated back into the system. By joining the power section and RGB oil systems at this point, it ensures that both systems are receiving clean and filtered oil, which helps to maintain the overall efficiency and performance of the engine.Rate this question:
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- 9.
Which RGB component prevents oil in the oil tank from draining into the RGB rear case?
- A.
Shutoff valve.
- B.
Oil pump and filter.
- C.
Oil pump check valve.
- D.
Oil pump bypass valve
Correct Answer
C. Oil pump check valve.Explanation
The oil pump check valve prevents oil in the oil tank from draining into the RGB rear case. This valve ensures that oil flows in one direction only, preventing any backflow or leakage. It acts as a barrier, allowing oil to be pumped into the RGB rear case but preventing it from flowing back into the oil tank. This helps maintain proper lubrication and prevents any potential damage or malfunction caused by oil leakage.Rate this question:
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- 10.
How many scavenge oil pumps are located in the RGB?
- A.
1.
- B.
2.
- C.
3.
- D.
4.
Correct Answer
B. 2.Explanation
There are two scavenge oil pumps located in the RGB.Rate this question:
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- 11.
The journeyman must be aware of which hazardous propert of modern jet engine oil?
- A.
Toxicity.
- B.
Viscosity.
- C.
Alkalinity.
- D.
Corrosiveness.
Correct Answer
A. Toxicity.Explanation
The journeyman must be aware of the toxicity of modern jet engine oil because it can pose a health risk if not handled properly. Jet engine oil contains chemicals that can be harmful if inhaled, ingested, or come into contact with the skin. Therefore, it is important for the journeyman to understand the potential hazards associated with the toxicity of the oil and take appropriate safety precautions to protect themselves and others.Rate this question:
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- 12.
The primary benefit of identifying an impending failure through the OAP is
- A.
Improved safety.
- B.
Increased component life.
- C.
Reduced maintenance cost.
- D.
Increased equipment availability.
Correct Answer
A. Improved safety.Explanation
The primary benefit of identifying an impending failure through the OAP is improved safety. By detecting potential failures in advance, necessary measures can be taken to prevent accidents or injuries. This ensures a safer environment for both personnel and equipment. While increased component life, reduced maintenance cost, and increased equipment availability are also important benefits of the OAP, the focus on safety takes precedence as it directly impacts the well-being of individuals and minimizes the risk of accidents.Rate this question:
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- 13.
Who is responsible for ensuring that the OAP operates properly?
- A.
Project monitor.
- B.
Logistics commander.
- C.
Propulsion flight chief.
- D.
Laboratory supervisor.
Correct Answer
A. Project monitor.Explanation
The project monitor is responsible for ensuring that the OAP (Operational Analysis Plan) operates properly. They oversee the project and monitor its progress, making sure that all aspects of the plan are being executed effectively. They may coordinate with various teams and stakeholders to ensure that the project is on track and meeting its objectives. The project monitor plays a crucial role in ensuring the success of the OAP.Rate this question:
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- 14.
What are microscopic metallic particles in the oil system called?
- A.
Wear metals.
- B.
Friction metals.
- C.
Precious metals.
- D.
Transformation metals.
Correct Answer
A. Wear metals.Explanation
Microscopic metallic particles in the oil system are called wear metals. These particles are generated due to the friction and wear between moving parts in the system. Over time, these wear metals can accumulate and cause damage to the components of the system. Monitoring and analyzing the concentration of wear metals in the oil can provide valuable information about the condition and health of the machinery.Rate this question:
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- 15.
Oil sampling intervals should not vary by more than
- A.
5 %
- B.
10%
- C.
15%
- D.
20%
Correct Answer
B. 10%Explanation
Oil sampling intervals should not vary by more than 10%. This means that the time between each oil sampling should not differ by more than 10% of the average sampling interval. Consistency in sampling intervals is important to ensure accurate and reliable oil analysis results. If the intervals vary too much, it can lead to inconsistent data and make it difficult to identify trends or detect potential issues in the oil. Therefore, it is recommended to maintain a maximum variation of 10% in oil sampling intervals.Rate this question:
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- 16.
The SEM/EDX analysis process differs from conventional oil analysis in which major aspect?
- A.
SEM/EDX samples must be sent off-site for analysis.
- B.
SEM/EDX particles must be oil free for analysis to take place
- C.
SEM/EDX provides results concerning equipment and components condition.
- D.
SEM/EDX samples can only be obtained in an intermediate maintenance shop.
Correct Answer
B. SEM/EDX particles must be oil free for analysis to take placeExplanation
SEM/EDX analysis requires that the particles being analyzed are free from oil. This is different from conventional oil analysis, where the presence of oil is expected and analyzed. SEM/EDX analysis focuses on providing results related to the condition of equipment and components, rather than analyzing the oil itself. The other options are not major aspects that differentiate SEM/EDX analysis from conventional oil analysis.Rate this question:
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