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Hydraulic Pumps > Module Questions > Flashcards

Module Questions Flashcards

1
Q 
Which of the following are the two major categories of positive displacement pumps?
A) Fixed and variable
B) Fixed and non-variable
C) Non-fixed and variable
D) Non-fixed and non-variable
A

a

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2
Q

What is the formula for horsepower?

A

gallons per minute X pressure X 0.000584

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3
Q

When does the pitting damage caused by cavitation occur?
A) As the oil changes changes state from liquid to gas
B) As the oil vapor bubbles collapse
C) As the air bubbles are formed

A

B

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4
Q

When are coolers generally placed?
A) Pressure
B) Return
C) Suction

A

b

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5
Q 
Assuming a constant load, which of the following motor functions will be affected if the pressure setting is increased or decreased?
A) Speed
B) Flow rate
C) Operating pressure
D) Available torque
A

D

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6
Q

The two types of actuators are cylindrical and rotary actuators.
True or False

A

True

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7
Q

Which of the following are functions of a reservoir? Select all the correct answers.

  1. Feeds the pump
  2. Allows the oil to cool
  3. Limits the pressure in the system
  4. Stores the hydraulic fluid
A

4, 1, 2

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8
Q

Match each line to its application

  1. Carries the main streak of flow in the system
  2. Carries leakage oil back to the reservoir
  3. Carries fluid that is used to control the operation of a valve or other component
  4. Drain line
  5. Pilot line
  6. Working line
A

Drain line- 2
Pilot line- 3
Working line- 1

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9
Q

Which of the following will happen if the outlet is blocked while a centrifugal pump is running?
A) the impeller will stop rotating
B) the impeller will reverse direction
C) the impeller may continue to rotate

A

A

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10
Q 
Mach each viscosity grade to its application.
VG64
VG32
VG46
High-temperature applications
General use
Arctic climates
A

VG64-
VG32-
VG46-

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11
Q

True or False. Positive displacement pumps are devices whose pump output is constant regardless of pressure, with the exception of changes in efficiency.

A

True

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12
Q 
In a hydraulics system, if 20 pounds are added to a 1 square inch piston and it descends 10 inches, how high will a 100 - pound weight move on a 5 square inch piston?
A) 5 inches
B) 1 inches
C) 10 inches
D) 2 inches
A

D: 2 inches

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13
Q

Why are gear pumps widely used?
A) They are nearly 100% efficient
B) Their pressure capabilities are a function of drive speed
C) They are rugged and relatively inexpensive

A

They are easy to manufacture, rugged, and relatively inexpensive.

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14
Q

Which of the following are used by manufacturers to rate actuators? Select all the correct answers.

  1. Maximum pressure limitations
  2. Displacement
  3. Volumetric inefficiencies
  4. Torque capacities
A

1, 4, 2

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15
Q 
Below are three types of displacement pumps.  Match each pump to its efficiency.
70%
80%
90%
1. Piston pump
2. Gear pump
3. Vane pump
A

Piston: 90%
Gear: 70%
Vane: 80%

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16
Q

T or F. If you change the position of the cam in relation to the inlet and outlet porting in a vane pump, you will change the direction of the flow.

A

False

17
Q

Cavitation is second only to contamination in the hydraulic fluid as a source of damage to hydraulic equipment. True or False.

A

True

18
Q

What is the particle count and particle size range required for newer Schlumberger equipment?

A

50-100

19
Q

To avoid choking the pump, what is used for filtration in the suction?

A

a

20
Q 
In a hydraulic system, if 10 pounds are added to a 1-square inch piston and it descends 10 inches, how high will a 100-pound weight be raised on a 10 square inch piston?
A) 1 inch
B) 5 inches
C) 2 inches
D) 10 inches
A

A

21
Q

Which of the following is true regarding using hydraulic power?

  1. Hydraulic power can be stalled without damage
  2. can provide high power output with very small weight and size
  3. can produce variable speeds and be reversed instantly
  4. is more efficient than direct-drive system
  5. offers overload protection due to pressure relief valves in most systems
A

1, 2, 3, 5

22
Q 
Which of the following devices does not use poppets and springs?
A) Check valve
B) Balanced piston relief valve
C) Pilot operated relief valve
D) Spool valve
A

D

23
Q 
Assuming a constant load, which of the following motor functions will be affected if the flow rate is increased or decreased?
A) Speed
B) Operating pressure
C) Displacement
D) Available torque
A

A

Hydraulic Pumps (2 decks)

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