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parts second year > hydraulics 203 > Flashcards

hydraulics 203 Flashcards

1
Q

what is the pout point of hydraulic fluids

A

the lowest temp at which the fluid will flow

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2
Q

what is the imperial unit of force

A

pounds

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3
Q

what is pi

A

3.14

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4
Q

what is created when pressure is less then atmospheric

A

vacuum

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5
Q

what size is hydraulic steel tubing that is labelled -12

A

outside diameter of 3/4

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6
Q

hydraulic fluids can be cooled by…

A

air and water

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7
Q

how are hydraulic hoses sized

A

ID

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8
Q

depth filters are

A

non-woven

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9
Q

what filter rating describes the size of particles that the filter is designed to remove

A

absolute rating

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10
Q

what is the formula used to determine a filters beta rating

A

upstream particles/downstream particles

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11
Q

what is the most common directional valve in a modern hydraulic system?

A

spool

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12
Q

What is the function on a pump

A

create flow

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13
Q

What component is used to support the driveshaft on a vane pump

A

bearing

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14
Q

What is the basic operating principle that can be applied to all hydraulic valves

A

control hydraulic flow

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15
Q

What is the purpose of a back pressure EGR valve

A

control the flow of exhaust gases to the intake mixer

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16
Q

How should a hydraulic cylinder be stored?

A

hung upright

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17
Q

What type of hydraulic cylinder is actuated by fluid in both extension and retraction

A

dual acting

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18
Q

If a customer recieves the wrong part what is the first thing you should do?

A

identify what is wrong about the part

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19
Q

What device converts hydraulic energy into rotary mechanical energy

A

motor

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20
Q

What related item should be sold with a replacement hydraulic motor

A

Fluid

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21
Q

Where is the greatest force exerted on a three stag telescoping cylinder

A

first stage

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22
Q

2 Types of single acting cylinders

A

Ram and Piston

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23
Q

What part connects left hand knuckle to the right hand knuckle

A

cross-tube, Tie rod

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24
Q

How are suspension systems categorized

A

type of energy absorbing device

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25
Q

The weight of all parts that is supported by the springs is referred to as…

A

sprung weight

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26
Q

What is the cause of spring wind up in a longitudinal leaf spring suspension

A

drive and brake

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27
Q

What is used with a leaf spring suspension in order to provide a better ride than that of a solid mount

A

equalizer beam

28
Q

What type of spring is used to help carry a heavy load

A

auxiliary spring

29
Q

When would a hose be used instead of tubing

A

offers more flexibility

30
Q

what is the purpose of shock absorbers

A

increase ride comfort

31
Q

What suspension system offers the most comfortable ride

A

air bags-air suspension

32
Q

Which steer system has the rear tires turning on the same track as the front tires

A

co-ordinated

33
Q

which component supplies the power steering system with hydraulic energy

A

pump

34
Q

What steering configuration involves a machine composed of two rigid frames which a turning point

A

aticulated

35
Q

How much additional power will be required to stop a vehicle if both the weight and the speed are both doubled

A

increased 8 times

36
Q

what is lag time

A

time required for the air system to apply the brakes

37
Q

What term describes the amount of friction between vehicle tires and road surface

A

traction

38
Q

What portion of stopping time is influenced when brake lining temperature is excessive

A

braking time

39
Q

what does brake fade refer to

A

decreased braking force due to decreased coefficient of friction

40
Q

What is not identified by outer edge code

A

GAWR

41
Q

Why are vehicles that comply with CMVSS 121 standard known as having dual braking system

A

they have 2 separate service brake circuits

42
Q

What type of brake materiel generates the least amount of dust

A

ceramic

43
Q

What will affect the brake lag time on an air brake system

A

air restrictions, brake adjustments

44
Q

What is the affective diaphragm area of a series 24 brake chamber

A

24 square inches

45
Q

What colour is the park control valve

A

yellow

46
Q

Where would the required information be found to supply a replacement compressor

A

nameplate

47
Q

What is the advantage of disc brake over drum brake

A

disk brakes are less prone to brake fade

48
Q

Where is the trailer supply valve located

A

by the park and trailer knobs (5)

49
Q

Who is the regulating body that oversees the air brake safety standards

A

federal government

50
Q

What is required on all brake lines sold in Canada

A

DOT markings

51
Q

Why is water a major concern in an air brake system

A

may freeze

52
Q

What is the purpose of the primary service brake circuit in an air brake system

A

control drive axle brakes

53
Q

What brakes must be applied 1st in order to maintain a straight line as a vehicle stops

A

trailer rear

54
Q

What bis happening when a compressor is in the unload cycle

A

inlet valves are held open

55
Q

What components supply the air used to release the park/emergency brakes

A

Primary or secondary tank

56
Q

How does the relay valve affect lag time?

A

valve speeds up brake application and release

57
Q

What component houses Bothe the park control valve and the trailer air supply valve

A

control module

58
Q

Why are double compartment tanks becoming more popular

A

lighter weight

59
Q

What controls the operation of the compressor in an air brake system

A

the governor

60
Q

What is the purpose of an alcohol injector

A

contamination control

61
Q

Which valve in the air brake system speeds up the application of the steering axle brake

A

quick release valve

62
Q

What component should be replaced at the same time as the is compressor

A

governor

63
Q

How do ABS systems prevent wheel lock up

A

they monitor wheel speed and modulate brake application

64
Q

What was a disadvantage to a pre-121 trailer brake circuit

A

no emergency brakes if trailer system failed

65
Q

What is a output device of ABS

A

brake modulator valve

66
Q

What is the purpose of the emergency brake in an air brake system

A

Mechanical means to park

parts second year (4 decks)

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