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Hydraulicspneumatics Com Sites Hydraulicspneumatics com Files Uploads Custom Inline Archive Www hydraulicspneumatics com Content Site200 Ebooks 01 01 2006 43641 Ch810png 00000019856
Hydraulicspneumatics Com Sites Hydraulicspneumatics com Files Uploads Custom Inline Archive Www hydraulicspneumatics com Content Site200 Ebooks 01 01 2006 43641 Ch810png 00000019856
Hydraulicspneumatics Com Sites Hydraulicspneumatics com Files Uploads Custom Inline Archive Www hydraulicspneumatics com Content Site200 Ebooks 01 01 2006 43641 Ch810png 00000019856

Quiz on Chapter 8: Air and Hydraulic Pumps

Dec. 17, 2006
1. A rule of thumb for air compressor output for each input horsepower is: 2 scfm @ 100 PSI 3 scfm @ 100 PSI 4 scfm @ 100 PSI 2. Large air compressors load and unload as pressure drops and builds. Small air compressors: do the same. ...

1. A rule of thumb for air compressor output for each input horsepower is:

  1. 2 scfm @ 100 PSI
  2. 3 scfm @ 100 PSI
  3. 4 scfm @ 100 PSI

2. Large air compressors load and unload as pressure drops and builds. Small air compressors:

  1. do the same.
  2. never build enough pressure.
  3. turn on at a minimum pressure and off at a maximum pressure.

3. A hydraulic pump produces:

  1. flow in gallons per minute (gpm).
  2. pressure in pounds per square inch (psi).
  3. both of the above.

4. A positive-displacement pump:

  1. cannot turn if the outlet is blocked.
  2. can turn with the outlet blocked.
  3. can only turn with the outlet blocked.

5. Gear pumps:

  1. can be variable volume.
  2. cannot be variable volume.
  3. can be pressure compensated.

6. Vane pumps:

  1. can be variable volume.
  2. cannot be variable volume.
  3. cannot be pressure compensated.

7. Piston pumps .

  1. can be variable volume.
  2. cannot be variable volume.
  3. cannot be pressure compensated.

8. An open-center circuit:

  1. blocks pump flow in the center condition.
  2. does not have a center condition.
  3. allows pump flow to go to tank in center condition.

9. A closed-center circuit:

  1. blocks pump flow in the center condition.
  2. does not have a center condition.
  3. allows pump to go to tank in center condition.
10. The symbol at right is a:
  1. pressure-compensated variable-volume pump.
  2. fixed-volume pump.
  3. bi-directional pump.

11. While the input shaft of a bi-directional pump is turning in one direction of rotation, it:

  1. can move fluid from either port.
  2. can only move fluid from one port.
  3. must have a suction line hooked to tank.

12. Wobble-plate piston pumps:

  1. must rotate in the opposite direction to reverse flow.
  2. can reverse flow while turning the same way.
  3. cannot reverse flow at anytime.

13. Swash-plate piston pumps:

  1. have moveable or fixed-angle swash plates.
  2. are always bi-directional.
  3. can only move fluid one way.

14. Bent-axis pumps :

  1. cannot be fixed volume.
  2. operate better at higher vacuum inlet.
  3. cannot be bi-directional flow.

15. Load-sensing pumps:

  1. operate at load pressure plus load-sense bias spring pressure.
  2. operate at compensator pressure at all times.
  3. cannot be variable volume.

16. Horsepower- and torque-limiting pumps:

  1. use extra horsepower all the time.
  2. use minimum horsepower all the time.
  3. never use more than a preset horsepower regardless of pressure.

17. Pump shaft alignment is not important at any time.

  1. True
  2. False

18. Closed-loop circuits:

  1. use a makeup pump to keep the loop full.
  2. must have extra large flow lines to keep the pump from cavitating.
  3. cannot reverse the direction of an actuator.

19. A pump-motor adapter is:

  1. a device to keep the pump from cavitating.
  2. a unit to match pump horsepower to motor horsepower.
  3. a device to directly attach a pump to an electric motor.

20. Cavitation is caused by:

  1. too little fluid volume at the pump inlet.
  2. too much fluid volume at the pump inlet.
  3. too much fluid volume at the pump outlet.

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