The following items will test your grasp of the material covered in this lesson. There is only one correct answer for each item. When you have completed the exercise, check your answers with the answer key that follows. If you answer any item incorrectly, study again that part of the lesson which contains the portion involved.
1. The pistons and cylinder block rotate at what RPM?
___ A. The same.
___ B. 500 RPM.
___ C. 750 RPM.
___ D. 1500 RPM.
2. How many types of hydraulic reservoirs are there?
___ A. One.
___ B. Two.
___ C. Three.
___ D. Four.
3. The stationary-cam pump is NOT used on what three Army aircraft?
___ A. UH-1H, AH-1S, and OV-1B.
___ B. UH-1D, AH-1H, and OV-1.
___ C. OV-1A, AH-1G, and UH-1E.
___ D. OV-1, AH-1G, and UH-1C.
4. What type of pump is often used in Army aviation?
___ A. Piston pump.
___ B. Rotating-cam pump.
___ C. Demand-principle compensator pump.
___ D. Rotating-compensator pump.
5. What is used to control piston-to-bore leakage in piston pumps?
___ A. Wiper rings.
___ B. O-rings.
___ C. Seals.
___ D. Close machining.
6. What type hydraulic pump would you most likely find on an Army AH-1?
___ A. Compensator pump.
___ B. Drive pump.
___ C. Piston pump.
___ D. Auxiliary pump.
7. The angular pump uses what type of compensator?
___ A. Stroke-reduction.
___ B. Reduction-stroke.
___ C. Cam-reduction.
___ D. Piston-reduction.
8. What component in a hydraulic system protects against pressure surges?
___ A. Double-check valve.
___ B. Stationary-cam pump.
___ C. Accumulator.
___ D. Hand-operated pump.
9. What type of pump has a check valve built into the piston?
___ A. Double-action hand pump.
___ B. Single-action hand pump.
___ C. Single-action cam pump.
___ D. Double-action cam pump.
10. What valve opens as the handle is moved to the right?
___ A. Double check valve.
___ B. Single check valve.
___ C. Outlet check valve.
___ D. Inlet check valve.
Item Correct Answer and Feedback
1. A. The same RPM.
Both operate alike because they are connected. (Page 8)
2. B. 2.
The two types of reservoirs are classified as vented and pressurized. (Page 2)
3. D. OV-l, AH-1G, and UH-1C.
All Army aircraft do not have the stationary-cam pump as an operating component. (Page 10)
4. B. Rotating-cam pump.
More Army aircraft use the rotating-cam pump than any type. (Page 9)
5. D. Close machining.
The piston and bore fit so closely that no other component is necessary to stop leakage. (Page 8)
6. C. Piston pump.
The Army has selected the most efficient, longest-lasting hydraulic pump to be used on its aircraft. (Page 7)
7. A. Stroke-reduction principle.
The length of the stroke can be controlled by angling the cylinder block. (Page 12)
8. C. Accumulator.
The accumulator can absorb increases in fluid volume to prevent damage to the system. (Page 12)
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9. A. Double-action hand pump.
The double-action hand pump has two check valves which allow fluid to be drawn into the left and right chambers. (Page 6)
10. D. Inlet check valve.
Moving the handle to the right results in a slight vacuum, which opens the inlet check valve as a result of the partial vacuum caused by the movement of the piston, allowing fluid to be drawn into the left chamber. (Page 6)
1. The pistons and cylinder block rotate at what RPM?
___ A. The same.
___ B. 500 RPM.
___ C. 750 RPM.
___ D. 1500 RPM.
2. How many types of hydraulic reservoirs are there?
___ A. One.
___ B. Two.
___ C. Three.
___ D. Four.
3. The stationary-cam pump is NOT used on what three Army aircraft?
___ A. UH-1H, AH-1S, and OV-1B.
___ B. UH-1D, AH-1H, and OV-1.
___ C. OV-1A, AH-1G, and UH-1E.
___ D. OV-1, AH-1G, and UH-1C.
4. What type of pump is often used in Army aviation?
___ A. Piston pump.
___ B. Rotating-cam pump.
___ C. Demand-principle compensator pump.
___ D. Rotating-compensator pump.
5. What is used to control piston-to-bore leakage in piston pumps?
___ A. Wiper rings.
___ B. O-rings.
___ C. Seals.
___ D. Close machining.
6. What type hydraulic pump would you most likely find on an Army AH-1?
___ A. Compensator pump.
___ B. Drive pump.
___ C. Piston pump.
___ D. Auxiliary pump.
7. The angular pump uses what type of compensator?
___ A. Stroke-reduction.
___ B. Reduction-stroke.
___ C. Cam-reduction.
___ D. Piston-reduction.
8. What component in a hydraulic system protects against pressure surges?
___ A. Double-check valve.
___ B. Stationary-cam pump.
___ C. Accumulator.
___ D. Hand-operated pump.
9. What type of pump has a check valve built into the piston?
___ A. Double-action hand pump.
___ B. Single-action hand pump.
___ C. Single-action cam pump.
___ D. Double-action cam pump.
10. What valve opens as the handle is moved to the right?
___ A. Double check valve.
___ B. Single check valve.
___ C. Outlet check valve.
___ D. Inlet check valve.
Item Correct Answer and Feedback
1. A. The same RPM.
Both operate alike because they are connected. (Page 8)
2. B. 2.
The two types of reservoirs are classified as vented and pressurized. (Page 2)
3. D. OV-l, AH-1G, and UH-1C.
All Army aircraft do not have the stationary-cam pump as an operating component. (Page 10)
4. B. Rotating-cam pump.
More Army aircraft use the rotating-cam pump than any type. (Page 9)
5. D. Close machining.
The piston and bore fit so closely that no other component is necessary to stop leakage. (Page 8)
6. C. Piston pump.
The Army has selected the most efficient, longest-lasting hydraulic pump to be used on its aircraft. (Page 7)
7. A. Stroke-reduction principle.
The length of the stroke can be controlled by angling the cylinder block. (Page 12)
8. C. Accumulator.
The accumulator can absorb increases in fluid volume to prevent damage to the system. (Page 12)
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9. A. Double-action hand pump.
The double-action hand pump has two check valves which allow fluid to be drawn into the left and right chambers. (Page 6)
10. D. Inlet check valve.
Moving the handle to the right results in a slight vacuum, which opens the inlet check valve as a result of the partial vacuum caused by the movement of the piston, allowing fluid to be drawn into the left chamber. (Page 6)
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Informative post on Hydraulics
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