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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
Another common name for Beta ratio (b) is ______________.
diameter ratio
26
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?
Quick Opening
27
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?
Venturi
28
The most commonly used fitting in control valve installations is the short-length concentric reducer.
True
29
"Chocked Flow" in a control valve occurs when
the flow through a valve is at its maximum
30
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
False
31
What is the value of base temperature in degree fahrenheit?
60 oF
32
If the specific volume of water at a given temperature is known, then the density of water at that temperature
can be obtained by taking the inverse of the specific volume value
33
The Beta Ratio is defined as the ratio of the bore to the inner diameter of the pipe.
True
34
Which one of the following Flow Meter is used to measure mass flow directly?
Coriolis Flow Meter
35
If the flow rate is m3/hr and the pressures are kPa, the N1 constant becomes 0.0865.
True
36
When cavitation occurs, it is located:
downstream of the vena contracta
37
The value of expension factor Y, for incompressible fluids is __________.
1
38
For stream flow, the transmitted impulse lines should come off
the side of the line
39
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.
False
40
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).
N6
41
Which one of the following devices is a cylindrical section of pipe with a reducing diameter which causes a restriction in the flow?
Nozzle
42
Which one of the following control valve characteristic should be considered where highly varying pressure drop conditions can be expected.
equal percentage
43
Different styles of Coriolis Flow Meters operates on the same principle
True
44
For fluid such as crude petrolium and its liquid products, with vapor pressure _____________ atmospheric pressure at base temperature.
less than or equa
45
The coefficient of discharge (Cd) is the ratio ___________________________ .
of the true flow to the theoretical flow based on Bernoulli's theorm.
46
Which one of the following devices does not collect information about the process variable and its relationship to desired setpoint?
control valve
47
A valve currently exhibits cavitation. which of the following does not reduce cavitation
increase the temperature of the process fluid
48
Which of the following statements about control valves is True?
cavitation is more harmful to the valve than flashing
49
A valve with flow change with large stem movement at full stem travel best describe a(n) ___________ valve
quick opening
50
Which one of the following flow meters is limited primarily to water and waste water applications?
Magnetic Flow Meters
51
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
True
52
While calculating the size of a flow meter, the value of reference termperature is usually assumed to be _______ oC.
20oC
53
The earliest control valves used in the industry are:
Manual Globe Valves
54
Given that the inside diameter of a pipe is 6.065 inch, then the nominal pipe size is:
6 inch
55
Which one of the following gas is used as a reference gas?
Dry air
56
The Reynold Number Factor (FR) for flow through a control valve is calculated to be 2400. Hence the flow can be charcterized as:
Transitional Flow
57
the control valve size must:
be smaller or same size as the pipe size
58
Differential pressure flow meters rely on a(n) ______________ in the pipe to cause a differntial pressure between the upstream and down stream.
obstruction
59
The Reynolds Number is a function of ____________.
flow rate
60
How many different styles of coriolis flow meters are used to measure the flow?
2
61
Which one of the following charts highlight how much a task can be delayed before other task dates are impacted.
Detail Gantt
62
__________________ view displays boxes for each task in the project and tasks on the critical path are highlighted in red
Network Diagram
63
Which one of the following items is NOT a resource factor that MS project Scheduling Engine takes into account?
Lag/Lead Time

INST 335 (1 decks)

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