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HET Year 1 > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

The amount of power put out by the actuator depends on the flow and pressure

A

The amount of power put out by the actuator depends on the flow and pressure

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2
Q

The operation of a hydraulic jack is based on which of the following laws?

A

Pascals law

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3
Q

Hydraulic pumps create flow only

A

Hydraulic pumps create flow only

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4
Q

What is the metric unit of pressure?

A

Pascals

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5
Q

The resistance to flow in a hydraulic system is increased with a heavier load. T or F

A

True

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6
Q

What is the resulting fore when 2000 psi acts upon a cylinder with a piston diameter of 4 inches

A

25,120 lbs

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7
Q

Why do manufacturers design equipment using a double acting cylinder which will extend when lifting lifting the heaviest load?

A

The Poston are is greater when the cylinder extends

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8
Q

Fact

A

Series hydraulic systems allow pressure to be compounded

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9
Q

What is the term for when pressure created due to gravity acting on a fluid

A

Head

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10
Q

Fact

A

Both atmospheric and head pressure force oil into the pump inlet

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11
Q

Differential cylinders extend slower than they retract

A

Differential cylinders extend slower than they retract

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12
Q

Gauge pressure includes atmospheric pressure. T or F

A

False

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13
Q

Pressure can be measured in inches of mercury. T or F

A

True

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14
Q

Why does liquid flow?

A

Liquids flow due to differential pressure

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15
Q

Flow rate is measured in gallons per minute

A

Flow rate is measured in gallons per minute

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16
Q

The speed of a liquid increases as it is forced through a restrictor

A

The speed of a liquid increases as it is forced through a restrictor

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17
Q

What is a hydraulic actuator

A

Motor

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18
Q

Hydrostatics is about liquids with low flows and high pressure

A

Hydrostatics is about liquids with low flows and high pressure

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19
Q

Pressure is responsible for creating force. T or F

A

True

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20
Q

The units of torque can be expressed as “lb-in” T or F

A

True

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21
Q

The units of volume can be expressed as “sq-inches”.

A

False

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22
Q

Torque is a force which acts in a rotational motion only

A

Torque is a force which acts in a rotational motion only

23
Q

Steel pipe is more rugged than steel tubing. T or F

A

True

24
Q

What is a result of using hydraulic fluid which is too viscous?

A

Increased power to the drive system

25
Q

What hydraulic components allows contaminants to settle?

A

Reservoir

26
Q

Internal baffle plates allow contaminates to settle in the reservoir

A

Internal baffle plates allow contaminates to settle in the reservoir

27
Q

It is advisable not to mix oils. T or F

A

True

28
Q

What describes the pour point of hydraulic oil?

A

The lowest temperature at which the oil will flow

29
Q

What best describes boundary lubrication

A

Asperities contact because of close tolerances

30
Q

Why is revealing a joint using pipe thread a problem

A

The overall length of the joint decreases

31
Q

What type of fittings are used in hydraulic applications?

A

JIC 37 degrees

32
Q

What best describes a hose which has a size of -8”

A

The hose has an inside diameter of 1/2”

33
Q

What filter rating compares the amount of particles entering the filter to the number of particles leaving the filter?

A

Beta rating

34
Q

What does the term “skiving” refer to?

A

Removing some external rubber

35
Q

What hydraulic components help prevent premature oxidization of hydraulic oil?

A

Oil cooler

36
Q

Where are most hydraulic oil coolers located?

A

Most coolers are placed in series in the return line

37
Q

What best describes the type of cooler used when the cooler is located in front of the engine radiator?

A

Oil to air

38
Q

What us not a component of a double acting hydraulic cylinder

A

Glad hand

39
Q

The effects of aeration are visible by watching the actuators

A

The effects of aeration are visible by watching the actuators

40
Q

Which of the following best describes a direct acting relief valve

A

Normally closed pressure control valve

41
Q

Relief valves can be readjusted by adding or subtracting shims. T or F

A

True

42
Q

Cracking pressure is the pressure required to allow the relief valve ball to unseat

A

Cracking pressure is the pressure required to allow the relief valve ball to unseat

43
Q

Why are rotary directional control valves typically used in systems with low flow and low pressure

A

Rotary control valves have high internal leakage

44
Q

What type of cylinders retract and extend hydraulically

A

Double acting cylinders

45
Q

What feature of a spool valve prevents oil leakage around the spool

A

Grooves

46
Q

What frature of a spool valve allows the operator a small amount of flow control?

A

Metering notches

47
Q

What feature provides reduced operator effort to activate a spool valve?

A

Pilot operation

48
Q

Closed center valves block oil from the pump when in the neutral position

A

Closed center valves block oil from the pump when in the neutral position

49
Q

What type of hydraulic actuator requires an external force to return to its home position?

A

Single acting cylinder

50
Q

Positive displacement pumps trap fluid to create flow

A

Positive displacement pumps trap fluid to create flow

51
Q

What is Pump displacement?

A

Pump displacement is the amount of fluid delivered when the pump turns one revolution

52
Q

What is pump flow rate?

A

The amount of fluid delivered after the pump runs for 1 minute at rated RPM

53
Q

Which component of a un-balanced external gear pump wears the most?

A

The inlet side of the pump body

54
Q

What feature of an external gear pump increases its volumetric efficiency?

A

Pressure plates

HET Year 1 (11 decks)

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