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MK1 > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

For extending use the______ Area

A

Cap

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2
Q

For retracting use the ____ Area

A

Net

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3
Q

100 degrees Celsius was considered the_______ ________ of water

A

boiling point

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4
Q

1 Bar = 14.5038 or ____ psi

A

14.5 psi

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5
Q

Kinetic Energy-Present in the Hydraulic System in the form of______ _______, also known as energy in motion.

A

fluid flow

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6
Q

Potential Energy-Present in the Hydraulic System in the form of Pressure, also known as _______ _________.

A

stored energy.

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7
Q

The smallest ______ visible to the naked eye is 40 micron

A

particle

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8
Q

Two important requirements for any inlet strainer:

  • The strainer must be capable of passing the _______volume with the permitted inlet pressure drop for that pump.
  • The strainer must provide bypass flow which is still within the limit.
A

Full pump volume

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9
Q

Sampling on Hydraulic Systems that do not have a defined oil change interval shall be taken ________

A

quarterly

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10
Q

Spectrometric analysis measures _______ _______ in the fluid by an
emission spectrometer in PPM.

A

wear metals

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11
Q

Oil samples shall be drawn from ________ machinery at normal operating temperatures and only from the designated sampling points.

A

running

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12
Q

After an oil and filter change, allow a minimum of ________ hours before sampling.

A

25 operating

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13
Q

Ingress Contamination- Referred to as __________ contamination, and it generally occurs during system service or maintenance.

A

environmental

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14
Q

Internally Generated Contamination-Created within the system by the ________ _______of hydraulic components.

A

moving parts

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15
Q

Inside diameter, designated by a dash number: The inside diameter (ID) of the hose is expressed in 16ths of an inch and is stenciled on the side of the hose. The inside of a -16 hose is ______.

A

1 inch.

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16
Q

Support clamps are not necessary for short lengths of hose; however hoses with an overall length ______ than 30 inches must be supported.

A

greater

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17
Q

About 5 to 8 percent of the flexible hose total length must be allowed as slack to provide freedom of movement________ ___________

A

under pressure

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18
Q

Flange JIC _____ is most commonly used in CG applications

A

37°

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19
Q

______ storage of hoses or hose assemblies should be in a cool, dry area, never exceeding 100o F.

A

Bulk

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20
Q

It is recommended that 5% of all hoses be changed each _______ to eliminate the need to change all hoses at the same time.

A

Quarter

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21
Q

Where a ______ test is not required, insert the annotation “NA.”

A

hydrostatic

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22
Q

An assembly mandrel is _______for all single-wire hoses in sizes 1⁄4 inch through 3⁄4 inch

A

required

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23
Q

Hydrostatic testing procedures require a test pressure of twice the ______ ______ pressure of the hose. The test pressure shall be held for approximately 5 minutes.

A

rated working

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24
Q

Those hose assemblies identified as “______ _______ ________” and operate in a low- pressure system (less than 150 psi) do not have to be hydrostatically tested.

A

Condition-Based Maintenance

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25
Q

The inner tube is a ______ rubber layer that is oil-resistant.

A

synthetic

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26
Q

The outer cover on a flexible hose_____ the reinforced layers

A

protects

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27
Q

The entire hose assembly _______ a hydrostatic test

A

requires

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28
Q

When a flexible hose is under pressure it _______ in the length and expands in diameter

A

contracts

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29
Q

Selecting the correct connector or _______ depends on Fluid Medium

A

fitting

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30
Q

_______ are either crimped or swaged onto the hose.

A

Fittings

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31
Q

Hose tags in an approved electronic database shall include scan-able _______ identifier

A

barcode

32
Q

At sea level, ________ ________ is 14.7 pounds per square inch (psi).

A

atmosphere pressure

33
Q

Atmospheric pressure _______ as elevation increases.

A

decreases

34
Q

If ______ in any enclosed space is less than atmospheric pressure, the condition is known as a
vacuum.

A

pressure

35
Q

Positive displacement pumps are used on all _______ systems

A

hydraulic

36
Q

Pumps create flow; it is the ________ to flow that creates pressure.

A

resistance

37
Q

The three most common flow control _______ are meter-out, meter-in, and bleed-off circuits.

A

circuits

38
Q

Hydraulic symbols used in standard_______ are shown in the at-rest position.

A

drawings

39
Q

The most common type of ________ circuit is the open-loop circuit.

A

hydraulic

40
Q

Hydraulic _______ must be as incompressible as possible to transmit power.

A

fluid

41
Q

two primary location for hydraulic filters are at the Pump discharge side and reservoir return and _____ pressure side and _____ pressure side

A

High and low

42
Q

Three Hydraulic fluid type groups are petroleum, fire-resistant and ________.

A

biodegradable

43
Q

Inlet strainers use a relatively coarse filtering element constructed of fine_____ ______.

A

wire mesh

44
Q

The formation of sludge on _______ walls interferes with cooling.

A

reservoir

45
Q

Most of the harmful contamination in hydraulic fluid is considerably _____ than 40 microns.

A

less

46
Q

Hydraulic fluid temperature should be maintained_____ 110°F, which will help keep moisture out of the fluid and maintain acceptable viscosity.

A

above

47
Q

The two purposes for a hydraulic accumulator are to act as a hydraulic ______ ________ and provide an auxiliary power source.

A

shock absorber

48
Q

Nitrogen is the most common gas used in Coast Guard hydraulic _______.

A

accumulators.

49
Q

Long hydraulic hoses should be _______ with the hoses pressurized.

A

inspected

50
Q

When conducting a second level hydraulic hose inspection you are looking for ______, soft spots and accelerated deterioration.

A

bulging

51
Q

2Q15 indicates on a hydraulic hose tag

A

second quarter, service life will expire 2015.

52
Q

A hose’s service life date and _______ testing date is tracked in the Hose Log.

A

hydrostatic

53
Q

fine tooth ________ or cut off wheel is commonly used when cutting a hose during fabrication.

A

hacksaw

54
Q

When assembling a hose, it is important to mark the outer hose cover just below the fitting socket to ensure the hose ______ _____ ________during nipple installation.

A

did not slip

55
Q

The two types of gears commonly found in hydraulic gear pumps are______ and Helical.

A

Spur

56
Q

The following are elements of a vane pump

slotted rotor, _______and valve plate.

A

vane

57
Q

Radial and Axial are the two designs of a hydraulic _______ pump.

A

piston

58
Q

The angled swash plate creates the _______________ motion in the pistons and controls the displacement (output) of the pump by controlling the piston stroke length.

A

reciprocating

59
Q

In a piping system _________ changes in direction can cause turbulent flow.

A

abrupt

60
Q

Pressure override is the difference between _________ pressure and full-flow pressure.

A

cracking

61
Q

In a Directional Control Valve, an ______\ Center has all ports open to each other.

A

Open

62
Q

In a Directional Control Valve, a ______ Center has A, B, and T ports open to each other.

A

Floating

63
Q

In a Directional Control Valve, a Closed Center has all ports ______.

A

blocked

64
Q

In a Directional Control Valve, a _______ Center has P and T ports open to each other while the A and B ports are blocked.

A

Tandem

65
Q

The Actuator in a hydraulic system converts hydraulic energy into _______ energy.

A

mechanical

66
Q

The ______ created by a hydraulic motor is Torque.

A

force

67
Q

Work is defined as _______ a force through a defined distance.

A

exerting

68
Q

Power is the ______ of doing work.

A

rate

69
Q

Take fluid samples from the _______-pressure side of a hydraulic system.

A

Low pressure

70
Q

Shaft seal failure is another problem that is often _______ by either contamination and/or a damaged output shaft.

A

caused

71
Q

The most common failure of hydraulic _______ is for one or more seals to begin leaking excessively.

A

cylinders

72
Q

The two most common locations for failure are the ____ and piston seals.

A

Rod

73
Q

_______ ______caused by cavitation and High vacuum pressure in the inlet side of the pump are two indications that the pump inlet strainer in a hydraulic system is clogged.

A

Noisy Pump

74
Q

Two types of strainers used in Hydraulic Systems are Wire Mesh and _______ ______.

A

Edge Disk or full flow strainer

75
Q

Full Flow and Proportional Flow are the two types of______ commonly used in hydraulic systems.

A

filters

76
Q

NEVER work on a running system, except for _______ ________ adjustments (e.g., setting the pressure relief valve).

A

minor pressure

77
Q

Excessive noise-Hydraulic fluid viscosity is too _____

A

high

MK1 (11 decks)

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