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2nd Sixth > 307 > Flashcards

307 Flashcards

1
Q

which characteristics of a fluid does a term specific gravity describe

A

density

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2
Q

pressure is measured in ___ in the english system

A

pounds per square inch

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3
Q

which of the following is not needed in order to calculate the work a hydraulic cylinder can do

A

power (ft-lb/min)

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4
Q

pascals law states that pressure exerted on a confined liquid

A

is distributed equally throughout the liquid

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5
Q

according to Bernoulli’s principal when fluid flow increases in a system the pressure

A

decreases

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6
Q

a hydraulic fluid must be able to do all of the following except

A

compress easily

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7
Q

a hydraulic fluid that exhibits little change in viscosity when heated is said to have a high

A

viscosity index

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8
Q

the ability of fluid to penetrate into small clearances between closely fitted parts is determined by the fluids

A

viscosity

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9
Q

which of the following when added to hydraulic fluid will limit oxidation

A

a chemical inhibitor

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10
Q

the best method of controlling hydraulic fluid contamination is the use of

A

good maintenance procedure

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11
Q

the ability of a filter or strainer to remove 100% of the containment particles of a particular size from a hydraulic fluid is called its

A

absolute rating

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12
Q

when the maximum allowable pressure drop of a filter is reached the filter will

A

allow particles to pass through the medium

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13
Q

the purpose of a filler in a hydraulic system is to

A

remove small contaminants

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14
Q

depth fillers do not

A

have a long service life

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15
Q

surface filter media made of sintered metal powders are used in high pressure systems because of their

A

thick mass

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16
Q

the seperation of contaminants from hydraulic fluid in a reservoir is added by

A

slow fluid movement

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17
Q

what is used in a hydraulic reservoir to aid fluid cooling

A

baffle

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18
Q

to maintain the temperature of a hydraulic fluid effectively the reservoir should have

A

thin walls

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19
Q

an air breather is installed on a fluid reservoir to

A

vent the reservoir

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20
Q

peak hydraulic system demands are usually met by the use of a(n)

A

accumulator

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21
Q

the resistance of a hydraulic system to fluid flow causes

A

pressure

22
Q

pump capacity is rated in all of the following terms exept

A

pounds per square inch

23
Q

the ratio of the actual delivery rate of a pump to its displacement is its

A

volumetric effieciency

24
Q

which of the following is NOT a type of gear pump

A

vane

25
Q

internal gear pumps normally are used in applications that have

A

pressures of less than 1000 psi

26
Q

the flow rate of hydraulic fluid through piping or taking is measured in

A

GPM

27
Q

pressure loss in a hydraulic line depends on the

A

flow velocity

28
Q

hydraulic lines should NEVER be constructed of

A

galvanized pipe

29
Q

in non critical applications having no severe stress safe working pressure of hydraulic piping are based on providing a safety factor of

A

6

30
Q

a disadvantage of using hose in hydraulic systems instead of piping or tubing is that the hose

A

is less permanent

31
Q

which of the following kinds of valves should be used in a hydraulic system to change the direction of motion of the cylinder

A

directional control valve

32
Q

a three way valve is identified by its three

A

paths

33
Q

the closing force of a direct acting solenoid valve is approximately

A

15 lbs

34
Q

the construction of a spool valve causes it to

A

be partially balanced

35
Q

a four way valve that can operate in three positions is called a

A

closed crossover valve

36
Q

the operating differential pressure of a relief valve is the difference between its maximum pressure and the

A

cracking pressure

37
Q

the flow from the outlet of a sequence valve is at

A

line pressure

38
Q

fluid pressure in one section of a hydraulic system is limited by a

A

reducing valve

39
Q

a shock suppressor is used in a hydraulic system as

A

protection against pressure surges

40
Q

a meter out flow control valve is used to regulate fluid flow from an

A

actuator

41
Q

straight line mechanical force is created by a

A

hydraulic cylinder

42
Q

the force exerted by a double acting piston is

A

less on the rod side

43
Q

a cylinder in which the retracting stroke is the power stroke is called a

A

pull type cylinder

44
Q

when a hydraulic cylinder is added to an existing system be sure that the

A

pump capacity is adequate

45
Q

mechanical shock is controlled in a hydraulic cylinder by means of a

A

cushioning device

46
Q

which of the following statements about hydraulic motors is true

A

they are all positive displacement pumps

47
Q

the pressure range of a hydraulic motor may vary from

A

100 - 5000 psi

48
Q

the overall efficiency of a hydraulic motor is defined as the

A

output HP divided by input HP

49
Q

a crescent shaped separator is used on some ___ gear motors

A

internal

50
Q

internal leakage in hydraulic gear motor is held a minimum by the use of

A

wear plates

2nd Sixth (8 decks)

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