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INST335 > Review > Flashcards

Review Flashcards

1
Q

The earliest control valves used in the industry are:

A

Manual Globe Valves

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2
Q

In liquids, choking occurs as a result of vaporization of the liquid when the static pressure within the valve drops below the vapor pressure of the liquid.

A

True

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3
Q

Which one of the following Flow Meter is used to measure mass flow directly?

A

Coriolis Flow Meter

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4
Q

Which one of the following control valve characteristic is recommended if the control valve pressure drop is constant?

A

Linear

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5
Q

Which one of the following flow meters is limited primarily to water and waste water applications?

A

Magnetic Flow Meters

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6
Q

Another common name for Beta ratio (b) is ______________.

A

diameter ratio

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7
Q

Which one of the following Equation Constant be used, if sizing the control valve for a liquid flow rate in mass units (lb/h or kg/h).

A

N6

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8
Q

The coefficient of discharge (Cd) is the ratio ___________________________ .

A

of the true flow to the theoretical flow based on Bernoulli’s theorm.

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9
Q

The control valve size must:

A

be smaller or same size as the pipe size

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10
Q

Which one of the following control valve characteristic is recommended if the control valve pressure drop is increasing DP with increasing load, DP at Maximum load >200% of Minimum load DP?

A

Quick Opening

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11
Q

Valve Sizing Coefficient

A

Cv

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12
Q

Equation constant, if sizing the valve for a flow rate in volumetric units (gpm or m3/h)

A

N1

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13
Q

Compressibility factor

A

Z

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14
Q

Expansion factor

A

Y

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15
Q

Molecular weight

A

M

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16
Q

Mass rate of flow

A

w

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17
Q

Volume rate of flow

A

q or Q

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18
Q

Liquid specific gravity

A

Gf

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19
Q

Piping geometry factor

A

FP

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20
Q

Numerical constant

A

N

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21
Q

Differential pressure flow meters rely on a(n) ______________ in the pipe to cause a differntial pressure between the upstream and down stream.

A

obstruction

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22
Q

Which one of the followinf flow metes are simple,inexpensive and works well with clean liquds and gasses?

A

orifice plate

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23
Q

When cavitation occurs, it is located:

A

downstream of the vena contracta

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24
Q

Which one of the following devices does not collect information about the process variable and its relationship to desired setpoint?

A

control valve

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25
Q

Given that the inside diameter of a pipe is 6.065 inch, then the nominal pipe size is:

A

6 inch

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26
Q

Which of the following statements about control valves is True?

A

cavitation is more harmful to the valve than flashing

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27
Q

When a fluid passes through a control valve, the pressure is lowest:

A

where the velocity of fluid is highest

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28
Q

“Chocked Flow” in a control valve occurs when:

A

the flow through a valve is at its maximum

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29
Q

The Reynold Number Factor (FR) for flow through a control valve is calculated to be 0.7. Hence the flow can be charcterized as:

A

Transitional Flow

30
Q

If the specific volume of water at a given temperature is known, then the density of water at that temperature:

A

can be obtained by taking the inverse of the specific volume value

31
Q

For stream flow, the transmitted impulse lines should come off:

A

the side of the line

32
Q

following pressure profile before and after a control valve in a pipe:

P1 600kPa

P2 250 kPa

Pv 300 kPa Pv is vapor pressure of liquid

Pvc 200 kPa Pvc is pressure at venacontracta

These values indicate that the control valve will experience:

A

Flashing

33
Q

Which of the following is a valid trim for control valves in the Fisher specification Mangaer software

A

equal percentage

34
Q

The sound pressure level that is two times more powerful that 50dB is

A

53 dB

35
Q

A valve currently exhibits cavitation. which of the following does not reduce cavitation?

A

increase the temperature of the process fluid

36
Q

A valve with flow change with large stem movement at full stem travel best describe a(n) ___________ valve

A

quick opening

37
Q

Which one of the following control valve characteristic is recommended if the control valve pressure drop is decreasing DP with increasing load, DP at maximum load

A

Equal Percentage

38
Q

Differential pressure flow meters rely on a(n) ______________ in the pipe to cause a differntial pressure between the upstream and down stream.

A

obstruction

39
Q

For fluid such as crude petrolium and its liquid products, with vapor pressure _____________ atmospheric pressure at base temperature.

A

less than or equal to

40
Q

Which one of the following control valve characteristic should be considered where highly varying pressure drop conditions can be expected.

A

equal percentage

41
Q

Which one of the following control valve characteristic is recommended if the control valve pressure drop is constant?

A

Linear

42
Q

Which one of the following control valve characteristic is recommended if the control valve pressure drop is increasing DP with increasing load, DP at Maximum load >200% of Minimum load DP?

A

Quick Opening

43
Q

The Reynolds Number is a function of ____________

A

flow rate

44
Q

The common rule of thumb used in sizing a modern control valve is

A

Make the size of the control valve one size smaller than the line size

45
Q

Valves with a(n)__________flow characteristic used on pressure control applications

A

equal percentage

46
Q

The Bernoulli coefficients are used only when the inlet piping diameter to a valve is equal to the outlet piping diameter

A

False

47
Q

The calculated deltaPmax value is compared with the actual pressure drop specified in the service conditions, and the greater of these two values is used in the sizing equations

A

False

48
Q

If the flow rate is m^3/hr and the pressures are pa, then N1 becomes 0.0865

A

true

49
Q

The most commonly used fitting in control valve installations is the short length concentric reducer

A

true

50
Q

Which one of the following Equation constant be used, if sizing the control valve for a gas flow rate in volumetric units and only if the specific gravity is known

A

N7

51
Q

The rate of flow through a valve under stated conditions

A

Valve Capacity

52
Q

It is the ratio of the magnitude of the output change of a given system or device to the magnitude of the input change that cause the output change

A

Gain

53
Q

The range through which an input signal be varied, upon reversal of direction, without initiating an observable change in the output signal

A

Dead Band

54
Q

A servomechanism that is mechanically connected to a moving part of a final control element or its actuator and that automatically adjusts its output to the actuator to maintain a desired position in proportion to the input signal

A

Positioner

55
Q

A valve trim element used to modulate the flow rate with either linear or rotary motion

A

Disk

56
Q

the internal components of a valve that modulate the flow of the controlled fluid

A

Trim

57
Q

The maximum difference in output value for any single input value during a calibration cycle, excluding errors due to dead band

A

Hysteresis

58
Q

A pneumatic, hydraulic or electrically powered device that supplies force and motion to open close a valve

A

Actuator

59
Q

The minimum possible change in input required to produce a detectable change in the output when no reversal of the input take place

A

Resolution

60
Q

The interconnection of process control components such that the information regarding the process variable is continuously fed back to the controller set point to provide continuous, automatic corrections to the process variable

A

Closed Loop

61
Q

A movable pressure responsive element that transmits force to the piston actuator stem

A

Piston

62
Q

The portion of the valve that contains the packing box and stem seal and can guide the stem

A

Bonnet

63
Q

The portion of the rotary shaft control valve assembly corresponding to the valve stem of a globe valve

A

shaft

64
Q

The part that connects the actuator to the valve stem and transmits motion (force) from the actuator to the valve

A

Actuator Stem

65
Q

The symmetrical flow controlling member used in the most common varieties of butterfly valves

A

disk, conventional

66
Q

A part of a valve trim that surrounds the closure member and can provide flow characterization and/or a seating surface.

A

cage

67
Q

A flexible, pressure responsive element that transmits force to the diaphragm plate and actuator stem.

A

Diaphragm

68
Q

The portion of a rotary-shaft control valve assembly corresponding to the seat of a globe valve

A

Seal ring

69
Q

A valve design in which one port is collinear with the valve stem or actuator, and other port is at right angle to the valve stem

A

Angle valve

70
Q

The most common type of segmented ball control valve

A

Ball, V-notch

INST335 (3 decks)

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