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MB3 > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

What can cause pressure loss in a hydraulic system?

A

Turbulent flow

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2
Q

What is a great advantage of hydraulics in transmitting power?

A

Its versatility.

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3
Q

What is used to control contamination of hydraulic fluid?

A

Filters are used

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4
Q

What valve is used to reverse the operation of a hydraulic cylinder

A

The direction control valve

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5
Q

Which type of line should not be used for hydraulics? (Plastic is an option for this)

A

Galvanized pipe as the coating contaminates the fluid

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6
Q

A meter put flow control valve is used to regulate flow from which device?

A

Meters the flow coming from anx actuator

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7
Q

What is used in a hydraulic system to promote fluid cooling?

A

Heat exchanger is used to dissipate the heat

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8
Q

In hydraulics what is the name of the part that restricts flow?

A

An orifice is used to restrict flow.

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9
Q

What is the probable cause of a slow moving of immovable double acting cylinder?

A

A probable cause is leaking piston seals.

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10
Q

It is considered good maintenance practice when servicing directional control valves to replace what?

A

All seals and o-rings in the valve

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11
Q

Flow meters or gauges are most commonly used when in hydraulic systems?

A

When testing the system to be sure it is functional at proper pressures and flows.

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12
Q

Cavitation of oil in a hydraulic pump is usually caused by what?

A

Air in the suction line

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13
Q

Detents are used in valves for what purpose?

A

They are used to achieve positive positioning of the valve.

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14
Q

What statement best describes the term pressure?

A

Force per unit of area

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15
Q

What does a bypass filter allow?

A

Full flow of fluid

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16
Q

A double acting cylinder that is double ended would be controlled by which valve?

A

4-way direction control valve

17
Q

What is the difference between a hydraulic motor and a hydraulic pump?

A

A hydraulic fluid drives a hydraulic motor causing it to turn a shaft connected to the motor, where as a hydraulic pump is rotated causing fluid to be moved by the pump.

18
Q

Identifying a 3-way 4 position valve is done by?

A

Counting the number of envelopes in the valve and the number of piping connections

19
Q

What should the capacity of a reservoir hold?

A

It should be able to hold 2 to 3 times the gpm

20
Q

How are pilot lines defined on a drawing?

A

They are identified by long dashes

21
Q

What is the primary function of hydraulic fluid?

A

To transmit force and energy

22
Q

What is used in hudraulic systems to store energy to be used later?

A

An accumulator is used.

23
Q

Short dashes are used for?

A

Drain lines to tank

24
Q

Pascals theory explains why a large piston has what type of force in comparison to a small piston?

A

It has great force due to the large surface area to pressure to act upon

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