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HET Study 3rd Year + IP > Pump Fundamentals 190301b > Flashcards

Pump Fundamentals 190301b Flashcards

1
Q

A hydraulic pump converts what kinds of energy?

A

Mechanical to Hydraulic

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2
Q

How does a pump draw in fluid?

A

By increasing internal volume, creating a low pressure area

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3
Q

How is a pumps displacement calculated?

A

Volume displaced per rotation of the pump multiplied by the rotations per minute.

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4
Q

What is the formula for calculating the displacement of a piston pump?

A

Volume of Piston x Number of pistons x RPM

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5
Q

What determines the displacement of a gear pump?

A

Sum of the capacity of all gear tooth pockets

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6
Q

What is the difference between a variable and non variable pump?

A

The ability to change the pumping volume of the pump

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7
Q

Can vane pumps be variable?

A

Yes

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8
Q

What position would the swash plate on a axial piston pump be if the pump was at max system pressure?

A

Zero Degrees

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9
Q

Reversible variable displacement pumps are used in what kind of system?

A

Hydro-static transmissions.

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10
Q

A pumps maximum flow rate is directly related to what?

A

Input speed

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11
Q

What could occur if maximum recommend pump speed is exceeded?

A

Cavitation

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12
Q

Mechanical efficiency is the is an expression of the amount of power required to overcome what?

A

Internal friction

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13
Q

Volumetric efficiency is a comparison of what?

A

Theoretical pump flow compared to actual pump flow

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14
Q

Comparing input power to a pumps output power will provide what?

A

Overall Efficiency

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15
Q

What are the pros of a gear pump?

A

Least expensive
least complex
Most rugged

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16
Q

What are the cons of a gear pump?

A

Low max pressure

Not variable

17
Q

Are gear pumps balanced or unbalanced?

A

Unbalanced

18
Q

Why is internal leakage required in a pump?

A

Lubrication

19
Q

What are the pros of a vane pump?

A

More efficient
Higher pressure
Can be variable

20
Q

What are the cons of a vane pump?

A

Expensive

21
Q

Which port is normally the largest on a pump?

A

The inlet port

22
Q

Which way should angled vane tips be installed?

A

So the highest point is the leading edge.

23
Q

What is done to help improve vane pump efficiency?

A

Outlet pressure is applied to the underside of the vanes

24
Q

Why are elliptical cam rings use?

A

To balance the pump when higher pressure are nessecary

25
Q

When are circular cam rings used?

A

In variable displacement vane pumps

26
Q

What controls the displacement of a variable vane pump?

A

The degree of eccentricity between the rotor and cam ring

27
Q

What is the benefit of a balanced pump?

A

Can operate at higher pressures

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