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ITEC - BS/AS Flashcards > Fluid Power Final > Flashcards

Fluid Power Final Flashcards

1
Q

Define fluid power

A

a type of system that uses energy to do work, by using a prime mover to drive a pump that presurizes a fluid, which is transferred through pipes & hoses to an actuator

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2
Q

6 basic components in a hydraulic circuit.

A

reservoir/tank
pump
prime mover
actuator
valves
piping

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3
Q

Reservoir?

A

holds oil

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4
Q

Pump?

A

forces oil through system

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5
Q

Prime mover?

A

drives pump by electric motor/other power source

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6
Q

Valves?

A

control oil direction, pressure, and flow rate

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7
Q

Actuator?

A

converts oil pressure to mechanical force/torque

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8
Q

Piping?

A

carries oil

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9
Q

Difference between a hydraulic system and a pneumatic system.

A

hydraulic - liquid
pneumatic - air

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10
Q

List the 3 systems that use energy to do work.

A

mechanical, electronic, hydraulic

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11
Q

Hydraulic v pneumatic actuator movement?

A

hydraulic more accurate

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12
Q

Hydraulic v Pneumatic operating pressure?

A

Operating Pressure – hydraulic is more

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13
Q

Hydraulic v Pneumatic actuator speed?

A

Actuator speed – hydraulic is less

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14
Q

Hydraulic v pneumatic component weight?

A

Component weight – Hydraulic is heavier

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15
Q

Hydraulic v pneumatic cost?

A

Cost – Hydraulic more expensive

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16
Q

advantages of fluid power over mechanical power systems.

A

Remote control, complex mechanical lineages eliminated, instantly reversible motion, automatic protection & instant lubrication

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17
Q

List the advantages of mechanical power systems over fluid power systems.

A

No oil leakage problems, no danger of bursting of hydaulic lines, no fire hazard

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18
Q

Pascal’s Law?

A

Force on a confined fluid results in equal pressure in all directions

Force (lbs) = Pressure (psi) x Area (in^2)

19
Q

How to find Full Area?(cap side)

A

pi x diameter^2/4

20
Q

Annular Area?

A

Full area - Rod area

21
Q

Volume?

A

Area x stroke length (in^3)

22
Q

Extension force?

A

system pressure x full area

23
Q

Retraction force?

A

system pressure x annular area

24
Q

How to convert volume in cubic inches to gallons?

A

divide by 231

25
Q

pump output power?

A

pump output power (hp) = flow rate (gallons/min) x Pressure (psi)/1714

26
Q

the amount of energy required to lift 550 lbs one foot in one second

A

hp

27
Q

is the amount of work that can be done in a certain amount of time, or the Rate of work

A

power

28
Q

the force that tends to cause a rotation

A

torque

29
Q

the motion of a load through a distance in something useful being done

A

work

30
Q

defined as the ability to do work

A

energy

31
Q

3 types of positive displacement pumps

A

gear, vane piston

32
Q

Define displacement.

A

Volume of oil required for the motor shaft to turn 1 complete rotation

33
Q

Define Nominal flow rate

A

theoretical amount of oil supplied by the pump at a given rotation speed. Equal to 1 pump displacement multiplied by rotation speed

34
Q

Define slip value

A

Indicates the amount of oil that does not reach the pump output for a given increase in pump pressure.

35
Q

4 basic applications of accumulators

A

backup power, auxiliary power, hydraulic shock absorber, leakage compensator

36
Q

5 probable causes that should be investigated when actuator fails to move

A

bad actuator
bad pump
DCV fails to shift
system pressure low
actuator load is excessive

37
Q

4 advantages of hydraulic motors over electric motors

A

uni/bi directional
instantly reversible
absorb severe shock loading
smaller & respond faster

38
Q

Hydraulic pumps create ______ not ___________

A

flow/pressure

39
Q

Resistance to _____creates _______

A

flow/pressure

40
Q

_______ determines actuator speed

A

flow

41
Q

___________determines actuator force

A

Pressure

42
Q

The speed of a hydraulic motor is a function of the circuit_____

A

flow

43
Q

The output force of a hydraulic motor is a function of the circuit _____

A

pressure

ITEC - BS/AS Flashcards (5 decks)

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