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INST 335 > Final > Flashcards

Final Flashcards

1
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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2
Q

Relative density for a gas is defined as a dimension value that expresses the ratio of the density of the flowing fluid to the density of a refernce gas as the same temperature and pressure reference condition

A

B) False

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3
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

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4
Q

Which one of the following measures can be determined by measuring the the difference in fluid pressure upstream and downstream of the orifice plate?

A

volumetric flow rate

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5
Q

While calculating the size of a flow meter, the value of reference termperature is usually assumed to be _______ F.

A

68 F

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6
Q

Valves with a(n) ______________ flow characteristic used on pressure control applications.

A

Equal Percentag

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7
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 < 20% of minimum load DP?

A

Equal Percentage

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8
Q

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

A

orifice plate

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9
Q

Which one of the following flow meters consists of a rotor mounted coaxially in the center of the meter body?

A

Turbine Flow Meter

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10
Q

Gas flows are most often measured and expressed in terms of

A

volume unit

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11
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

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12
Q

The General Flow Equations are capable to the measurement of all clear, singlephase, and homogeneous Newtonian fluids with pipe Reynolds Number >= 4000

A

True

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13
Q

The pipe Reynolds Number is a dimension ratio of forces used to correlate the variations in discharge coefficient with the chnages in fluid properties, flow rate, and orifice meter geometry.

A

False

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14
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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15
Q

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

A

False

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16
Q

The mass and volume flow rate equations depends on the density of the fluid.

A

Tru

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17
Q

Which one of the following device is a thin, circular metal plate with a hole in the middle tha is placed in the pipe between two flanges to provide a restriction?

A

orifice plat

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18
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

A

B) Flashing

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19
Q

Which one of the following meters measure the frequency of twisters to determine flow velocity?

A

Vortex Flow Meter

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20
Q

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

A

equal percentage

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21
Q

Coriolis Flow Meters are installed to measure volumetric flow

A

False

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22
Q

Coriolis Flow meters are generaly limited to size 6 inch and under and they are inexpensive.

A

False

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23
Q

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

A

53dB

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24
Q

The turndown of differential pressure flow meters is the ratio of the ______________________________.

A

maximum flow to the minimum flow they can measur

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25
Q

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

A

diameter ratio

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26
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

27
Q

Which one of the following devices is a cylindrical length of pipe with reducing diameter which causes a restriction in the flow, followed by an increasing diameter to produce a gradual pressure recovery?

A

Venturi

28
Q

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

A

True

29
Q

“Chocked Flow” in a control valve occurs when

A

the flow through a valve is at its maximum

30
Q

The calculated DPmax 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 equation

A

False

31
Q

What is the value of base temperature in degree fahrenheit?

A

60 oF

32
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

33
Q

The Beta Ratio is defined as the ratio of the bore to the inner diameter of the pipe.

A

True

34
Q

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

A

Coriolis Flow Meter

35
Q

If the flow rate is m3/hr and the pressures are kPa, the N1 constant becomes 0.0865.

A

True

36
Q

When cavitation occurs, it is located:

A

downstream of the vena contracta

37
Q

The value of expension factor Y, for incompressible fluids is __________.

A

1

38
Q

For stream flow, the transmitted impulse lines should come off

A

the side of the line

39
Q

The expension factor Y is an emperical expression used to correct the pressure drop that a comressible fluid experience when it passes through the orifice’s bore.

A

False

40
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

41
Q

Which one of the following devices is a cylindrical section of pipe with a reducing diameter which causes a restriction in the flow?

A

Nozzle

42
Q

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

A

equal percentage

43
Q

Different styles of Coriolis Flow Meters operates on the same principle

A

True

44
Q

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

A

less than or equa

45
Q

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

A

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

46
Q

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

A

control valve

47
Q

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

A

increase the temperature of the process fluid

48
Q

Which of the following statements about control valves is True?

A

cavitation is more harmful to the valve than flashing

49
Q

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

A

quick opening

50
Q

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

A

Magnetic Flow Meters

51
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

52
Q

While calculating the size of a flow meter, the value of reference termperature is usually assumed to be _______ oC.

A

20oC

53
Q

The earliest control valves used in the industry are:

A

Manual Globe Valves

54
Q

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

A

6 inch

55
Q

Which one of the following gas is used as a reference gas?

A

Dry air

56
Q

The Reynold Number Factor (FR) for flow through a control valve is calculated to be 2400. Hence the flow can be charcterized as:

A

Transitional Flow

57
Q

the control valve size must:

A

be smaller or same size as the pipe size

58
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

59
Q

The Reynolds Number is a function of ____________.

A

flow rate

60
Q

How many different styles of coriolis flow meters are used to measure the flow?

A

2

61
Q

Which one of the following charts highlight how much a task can be delayed before other task dates are impacted.

A

Detail Gantt

62
Q

__________________ view displays boxes for each task in the project and tasks on the critical path are highlighted in red

A

Network Diagram

63
Q

Which one of the following items is NOT a resource factor that MS project Scheduling Engine takes into account?

A

Lag/Lead Time

INST 335 (1 decks)

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