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INST 6014_Flow Measurement - Orifice Plates

Question 1:
Flow leaving an orifice reaches a point where its area is minimum and the velocity is maximum. This is referred to as:
A - The vena contracta
B - The differential velocity
C - Straightening
D - The orifice constant
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Question 2:
Kinetic energy is the energy the fluid has by virtue of its:
A - Pressure
B - Position
C - Temperature
D - Motion
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Question 3:
The eccentric orifice is designed to pass fluids with suspended or entrained material because these impurities:
A - Build up behind the plate and cause erratic or false readings
B - Increase the temperature of the flow
C - Provide the kinetic energy necessary for flow
D - Reduce the pressure of the flow
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Question 4:
If you were asked to recommend an orifice plate design that is best suited for measuring a low flow gas process where the flow can be as low as low as 500 cm³/min, which orifice plate design should you recommend to obtain the best measurements?

A - Eccentric
B - Segmental
C - Integral
D - Concentric
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Question 5:
To linearize the input to a controller or indicator from an orifice plate transmitter, a device called a/an __________________ is required.
A - input amplifier
B - continuous integrator
C - converter
D - square root extractor
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Question 6:
Which of the following flow measuring devices is considered a positive displacement meter?

A - Bellows type
B - Turbine
C - Orifice plate
D - Pitot tube
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Question 7:
The main disadvantage of an orifice plate installation is the:
A - Difficulty of installation and replacement
B - High-pressure loss
C - High price
D - Inflexibility for changes in flow range
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Question 8:
Which orifice plate type is used where a line must be kept completely drained?
A - Segmental
B - Integral
C - Concentric
D - Eccentric
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Question 9:
The orifice plate shown here is a/an ___________ type.

A - concentric
B - eccentric
C - segmental
D - integral
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Question 10:
Which orifice plate type consists of a circular metal plate with a central hole or orifice?
A - Concentric
B - Eccentric
C - Segmental
D - Integral
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Question 11:
When measuring the actual rate of flow, if the total quantity that flows in a given time is required, the quantities flowing in each small time interval must be:
A - Divided by the time taken to flow
B - Directly proportional to the cube root of the diameter of the pipe
C - Measured separately
D - Summed or integrated
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Question 12:
The specifications for the design and installation of differential pressure flowmeters is set by ANSI/API Standard 2530.

A - True
B - False
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Question 13:
The standard that governs the specifications for the design and installation of differential pressure flowmeters states that the upstream edge of the orifice plate shall be as flat as can be obtained commercially and shall be:
A - Parallel to the axis of the pipe
B - Perpendicular to the axis of the pipe
C - Installed with the bevel facing upstream
D - Bevelled at an angle of greater than 45 degrees
_______________________________________________

Question 14:
Which orifice plate type is designed so that the hole is flush (within 1%) of the bottom of a horizontal pipe?
A - Segmental
B - Concentric
C - Eccentric
D - Integral
_______________________________________________

Question 15:
Differential pressure flow meters:
A - Do not create a drop in pressure
B - Can be used to measure level
C - Measure the difference in pressure across a restriction placed in a pipe
D - Are classified as variable area meters
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Question 16:

From the vena contracta, the stream section expands until it reaches a distance of about six pipe diameters downstream from the orifice plate, where the downstream static pressure recovers its upstream value.
A - True
B - False
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Question 17:
Which of the following instruments used in measuring flow is not considered a positive displacement meter:
A - Nutating disk meter
B - Rotating vane type meter
C - Bellows type meter
D - Turbine meter
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Question 18:
The distance of the vena contracta from the orifice varies with the ratio of:
A - Orifice diameter to pipe length
B - Orifice diameter to pipe diameter
C - Orifice diameter to flow temperature
D - Orifice plate thickness to pipe diameter
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Question 19:
For orifice plates that are manufactured with a bevelled edge, that edge must be installed facing:
A - Downstream
B - In any direction so long as the orifice opening impedes the stream
C - Perpendicular to the flow
D - Upstream
_______________________________________________

Question 20:
The design of an integral orifice involves the installation of a very small orifice into a manifold, where it becomes an "integral" part of the:
A - Bottom of a horizontal pipe
B - Pitot venturi tubes
C - Differential-pressure transmitter
D - Concentric orifice plate
_______________________________________________

Question 21:

Potential energy is the energy the fluid has by virtue of its:
A - Position
B - Pressure
C - Motion
D – Temperature

6016_Flow Measurement - Introduction to Velocity Type Flow

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Question 1:
A mass flowmeter:
A - Is recommended for wastewater, slurries, sludge, viscous liquids and abrasives
B - Can be used with any conductive fluid
C - Is used to measure the velocity of liquids, gases and vapours such as cryogenic liquids, industrial gases and steam
D - May also be used for density measurement
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Question 2:
A turbine flowmeter operates on the principle:

A - That when a conductor moves through a constant magnetic field a voltage is induced in it
B - That when a fluid flows in a pipe past a non-streamline object, the flow forms eddies on the downstream side of the object
C - That flow can be determined by introducing an angular momentum to the fluid and then measuring the torque produced by this momentum
D - That flow in the meter will cause the rotor to rotate at a rate that is directly proportional to the volumetric flow
_______________________________________________

Question 3:
Turbine meters are highly accurate and can be quite sensitive to severe upstream disturbances in the flow. In instances where such conditions exist, ____ diameters of straight pipe should be installed upstream of the meter.
A - 15
B - 50
C - 10
D - 30
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Question 4:
Process physical properties do not affect the performance of the vortex shedding meter except for:
A - Low temperature fluids
B - High viscosity fluids
C - High pressure applications
D - Low viscosity fluids
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Question 5:
An advantage of a turbine meter is:
A - They are relatively inexpensive
B - They have high accuracy
C - They have no moving parts
D - They can withstand surges
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Question 6:
A disadvantage of ultrasonic flowmeters is:
A - They cannot measure slurries
B - They are not linear
C - They are adversely affected by changing fluid properties
D - They can measure liquids only
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Question 7:
The basic principle of the turbine flowmeter involves suspending a/an:

A - Multibladed rotor perpendicular to the flow in the pipe
B - Unibladed rotor perpendicular to the flow in the pipe
C - Multibladed rotor parallel to the flow in the pipe
D - Unibladed rotor parallel to the flow in the pipe
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Question 8:
An advantage of a magnetic flowmeter is:
A - They are linear
B - They do not require the pipeline to be full of liquid
C - They are well suited for hydrocarbon flow measurement
D - They are not affected by build-up on pipe walls
_______________________________________________

Question 9:
If the area of the pipe remains constant, as it does in a pipeline, flow is inversely proportional to the velocity of the fluid.
A - True
B - False
_______________________________________________

Question 10:
A disadvantage of a turbine meter is:
A - They cannot withstand entrained solids
B - They are unidirectional
C - They have a high turndown ratio
D - They are non-linear
_______________________________________________

Question 11:
The mass flowmeter measures the volume change generated by the fluid as it moves through the meter. It operates by rotating an S-shaped tube at its natural frequency of around 1 600 hertz with a peak-to-peak displacement of approximately 10 mm.

A - True
B - False
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Question 12:
A vortex flowmeter operates on the principle:
A - That when a fluid flows in a pipe past a non-streamline object, the flow forms eddies on the downstream side of the object
B - That flow can be determined by introducing an angular momentum to the fluid and then measuring the torque produced by this momentum
C - That when a conductor moves through a constant magnetic field a voltage is induced in it
D - That flow in the meter will cause the rotor to rotate at a rate that is directly proportional to the volumetric flow
_______________________________________________

Question 13:
What is the flow (l/min) of water through a 1 cm (2.54 in) turbine with a K- factor of 754 pulses/litre and an output frequency of 800 Hz?

Use the formula

A - 63.66 l/min
B - 52.57 l/min
C - 86.67 l/min
D - 48 000 l/min
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Question 14:
The term used to describe the ability of the meter to correctly measure the true volume of the material being measured is:
A - Reliability
B - Accuracy
C - Rangeability
D - Repeatability
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Question 15:
The rate at which the vortices are formed and then shed is:
A - Directly proportional to the velocity of the flow
B - Directly proportional to the volume of the flow
C - Directly proportional to the K-factor of the flow
D - Inversely proportional to the velocity of the flow
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Question 16:
A magnetic flowmeter operates on the principle:
A - That when a fluid flows in a pipe past a non-streamline object, the flow forms eddies on the downstream side of the object
B - That flow in the meter will cause the rotor to rotate at a rate that is directly proportional to the volumetric flow
C - That flow can be determined by introducing an angular momentum to the fluid and then measuring the torque produced by this momentum
D - That when a conductor moves through a constant magnetic field a voltage is induced in it
_______________________________________________
Question 17:
The ultrasonic flowmeter uses the Doppler effect in its operation through the use of a:
A - Frequency modulator and a magnetic coil
B - Transducer, sonic reflectors and a receiver
C - Conductor moving through a variable magnetic field
D - Bluff body and an electronic transducer
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Question 18:
Faraday's Law of electromagnetic induction states that when a conductor moves through a:
A - Constant magnetic field, a voltage is produced which is proportional to the relative velocity at 180° to the field
B - Variable magnetic field, a voltage is produced which is proportional to the relative velocity at 180° to the field
C - Variable magnetic field, a voltage is produced which is proportional to the relative velocity at 90° to the field
D - Constant magnetic field, a voltage is produced which is proportional to the relative velocity at 90° to the field
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Question 19:
In the basic flow equation, "Q = vA", what does "A" equal?

A - The average fluid velocity in m/s
B - The area of the pipe in m²
C - The flow rate in m ³/s
D - The average fluid pressure in kPa
_______________________________________________

Question 20:
A mass flowmeter operates on the principle:

A - That flow can be determined by introducing an angular momentum to the fluid and then measuring the torque produced by this momentum
B - That when a conductor moves through a constant magnetic field a voltage is induced in it
C - That when a fluid flows in a pipe past a non-streamline object, the flow forms eddies on the downstream side of the object
D - That flow in the meter will cause the rotor to rotate at a rate that is directly proportional to the volumetric flow

Azamat Bazarov

Question 1:

The standard that governs the specifications for the design and installation of differential pressure flowmeters states that the upstream edge of the orifice plate shall be as flat as can be obtained commercially and shall be:

A - Bevelled at an angle of greater than 45 degrees
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B - Perpendicular to the axis of the pipe
C - Installed with the bevel facing upstream
D - Parallel to the axis of the pipe