PTEC 131 - Exam 4 And 5 - Spr 14

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| By Cstevenson_ladel

Cstevenson_ladel

Community Contributor

Quizzes Created: 5 | Total Attempts: 1,279

Questions: 67 | Attempts: 152 | Updated: Aug 23, 2024

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Quiz Description

Questions and Answers

1.

_________ measures another process variable in order to determine level.
- A.
  
  Ullage
- B.
  
  Inage
- C.
  
  Indirect level measurement
- D.
  
  Direct level measurement
- E.
  
  Interface level
Correct Answer
C. Indirect level measurement

Explanation
Indirect level measurement is the correct answer because it refers to the method of determining the level of a process variable by measuring another related variable. This approach is often used when direct measurement of the level is not feasible or accurate enough. Instead, an indirect measurement is taken, such as measuring the pressure or temperature, and then using a calculation or correlation to determine the level. This method is commonly used in industries where the level of a substance needs to be monitored, such as in tanks or vessels.

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2.

A distance from the surface of a liquid that extends downward is ______.
- A.
  
  Height
- B.
  
  Meniscus
- C.
  
  Depth
- D.
  
  Liquid Head Pressure
Correct Answer
C. Depth

Explanation
The term "depth" refers to the distance from the surface of a liquid that extends downward. It is a measure of how deep or far down something is submerged in the liquid. In this context, depth is the correct answer as it accurately describes the distance from the liquid's surface.

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3.

The measurement from the surface of the product to the top of a tank is ________.
- A.
  
  Ullage
- B.
  
  Inage
- C.
  
  Indirect level measurement
- D.
  
  Direct level measurement
- E.
  
  Interface level
Correct Answer
A. Ullage

Explanation
Ullage refers to the space between the surface of a liquid in a tank and the top of the tank. It is the measurement of the empty space or headspace in the tank. This term is commonly used in industries such as oil and gas, where it is important to measure the amount of remaining space in a tank to prevent overfilling or underfilling. Therefore, ullage is the correct answer to the question as it specifically refers to the measurement from the surface of the product to the top of a tank.

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4.

A distance from a zero reference point to the surface is _________.
- A.
  
  Height
- B.
  
  Meniscus
- C.
  
  Depth
- D.
  
  Liquid Head Pressure
Correct Answer
A. Height

Explanation
The distance from a zero reference point to the surface is referred to as "height".

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5.

The measurement of the process variable directly in terms of itself.
- A.
  
  Ullage
- B.
  
  Inage
- C.
  
  Indirect level measurement
- D.
  
  Direct level measurement
- E.
  
  Interface level
Correct Answer
D. Direct level measurement

Explanation
Direct level measurement refers to the method of measuring the level of a substance in a tank or container by directly measuring the process variable itself. This means that the measurement is obtained by directly observing and quantifying the level of the substance, without the need for any calculations or conversions. It is a straightforward and accurate method of level measurement, providing real-time information about the level of the substance in the container.

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6.

The measurement from the bottom of a tank to the surface of the product is ______.
- A.
  
  Ullage
- B.
  
  Inage
- C.
  
  Indirect level measurement
- D.
  
  Direct level measurement
Correct Answer
B. Inage
7.

A plane where two materials meet.
- A.
  
  Ullage
- B.
  
  Inage
- C.
  
  Meniscus
- D.
  
  Interface level
Correct Answer
D. Interface level

Explanation
The term "interface level" refers to the boundary or surface where two different materials meet. In the context of the question, it is likely referring to a plane or surface where two materials with different properties or characteristics come into contact. This could be seen in various scenarios, such as the interface level between oil and water in a container or the interface level between two layers of soil.

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8.

A measurement of level based upon percentage is called ___________.
- A.
  
  Height
- B.
  
  Liquid Head Pressure
- C.
  
  Percent level
- D.
  
  Meniscus
- E.
  
  Interface level
Correct Answer
C. Percent level

Explanation
Percent level is the correct answer because it refers to a measurement of level based upon percentage. This means that the level is determined by calculating the percentage of the total capacity or range of the container or system being measured. It is a common method used in various industries to quantify the level of liquid or material in a tank or vessel.

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9.

Mass per unit volume.
- A.
  
  Meniscus
- B.
  
  Inage
- C.
  
  Density
- D.
  
  Direct level measurement
Correct Answer
C. Density

Explanation
Density is the correct answer because it refers to the mass per unit volume of a substance. It is a physical property that is often used to identify and classify materials. Density is calculated by dividing the mass of an object by its volume. It is commonly measured in units such as grams per cubic centimeter or kilograms per liter. The density of a substance can provide information about its composition, purity, and even its behavior in certain conditions.

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10.

The pressure exerted by a column height of liquid
- A.
  
  Height
- B.
  
  Liquid Head Pressure
- C.
  
  Percent level
- D.
  
  Meniscus
- E.
  
  Interface level
Correct Answer
B. Liquid Head Pressure

Explanation
Liquid head pressure refers to the pressure exerted by a column of liquid due to its height. The higher the height of the liquid column, the greater the pressure it exerts. This pressure is caused by the weight of the liquid pushing down on the lower levels. Liquid head pressure is commonly used in various applications, such as in measuring fluid levels in tanks or in determining the pressure required for liquid flow in pipes.

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11.

The curved upper surface of a column of liquid.
- A.
  
  Meniscus
- B.
  
  Inage
- C.
  
  Density
- D.
  
  Direct level measurement
Correct Answer
A. Meniscus

Explanation
The correct answer is "Meniscus." The meniscus refers to the curved upper surface of a column of liquid, typically seen in a graduated cylinder or a test tube. It occurs due to the adhesive and cohesive forces between the liquid and the container. The shape of the meniscus can be used to measure the volume of the liquid accurately.

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12.

Level can be defined as the __________ of a material’s surface distance from a zero reference.
- A.
  
  location
- B.
  
  Depth
- C.
  
  Point
- D.
  
  Height
Correct Answer
D. Height

Explanation
Level can be defined as the height of a material's surface distance from a zero reference. In other words, it refers to the vertical distance from a specific point on the material's surface to a reference point that is considered as zero. This measurement is commonly used in construction, engineering, and surveying to determine the relative elevation or vertical position of objects or surfaces.

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13.

A device comprised of a strain gauge bonded to a robust support column called a force beam that together are capable of supporting the entire weight of a vessel and its contents.
- A.
  
  Tape Gauge
- B.
  
  Load Cell
- C.
  
  Displacer
- D.
  
  Welded Pad Level Gauge
Correct Answer
B. Load Cell

Explanation
A load cell is a device that is used to measure the force or weight applied to it. It consists of a strain gauge bonded to a support column called a force beam. This combination allows the load cell to support the entire weight of a vessel and its contents. Therefore, the load cell is the correct answer in this case.

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14.

Where all level points in the tank from the zero percent level (bottom of the measuring device) to one hundred percent full are monitored.
- A.
  
  Percent Level Measurement
- B.
  
  Transparent Level Gauge
- C.
  
  Reflex Level Gauge
- D.
  
  Continuous Level Measurement
Correct Answer
D. Continuous Level Measurement

Explanation
Continuous level measurement is the correct answer because it is the only option that accurately describes monitoring all level points in the tank from the bottom (zero percent level) to the top (one hundred percent full). Percent level measurement, transparent level gauge, and reflex level gauge do not necessarily monitor the entire range of levels in the tank.

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15.

A special kind of head pressure measuring method allowing the measurement of head pressure in a liquid without the pressure sensor coming in contact with the process fluid.
- A.
  
  Ultrasonic Device
- B.
  
  Bubbler
- C.
  
  Tubular Sight Glass
- D.
  
  Welded Pad Level Gauge
Correct Answer
B. Bubbler

Explanation
A bubbler is a special kind of head pressure measuring method that allows the measurement of head pressure in a liquid without the pressure sensor coming in contact with the process fluid. This is achieved by using a gas or air supply to create a bubble in a dip tube submerged in the liquid. The pressure required to maintain the bubble at a constant height is directly proportional to the head pressure of the liquid. By measuring this pressure, the head pressure can be determined without direct contact with the fluid.

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16.

Has two transparent flat-glass panels, front and back, that form a vertical chamber in conjunction with the metal sides where the process level can be seen.
- A.
  
  Percent Level Measurement
- B.
  
  Transparent Level Gauge
- C.
  
  Reflex Level Gauge
- D.
  
  Continuous Level Measurement
Correct Answer
B. Transparent Level Gauge

Explanation
A transparent level gauge has two transparent flat-glass panels, front and back, that form a vertical chamber in conjunction with the metal sides. This design allows the process level to be seen directly through the glass panels, providing a visual indication of the level. It is commonly used for applications where the level needs to be easily observed and monitored.

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17.

Uses tightly controlled gamma radiation source with a detector to infer a level in a tank and used when other technologies are unsuccessful.
- A.
  
  Nuclear Device
- B.
  
  Transparent Level Gauge
- C.
  
  Reflex Level Gauge
- D.
  
  Continuous Level Measurement
Correct Answer
A. Nuclear Device

Explanation
A nuclear device is used in this scenario because it utilizes a tightly controlled gamma radiation source and a detector to infer the level in a tank. This technology is employed when other measurement technologies are unsuccessful in accurately determining the level.

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18.

A sealed cylindrically shaped tube used to measure buoyancy.
- A.
  
  Tape Gauge
- B.
  
  Load Cell
- C.
  
  Displacer
- D.
  
  Welded Pad Level Gauge
Correct Answer
C. Displacer

Explanation
A displacer is a sealed cylindrically shaped tube that is used to measure buoyancy. It is commonly used in level measurement applications, where it is immersed in a liquid. The buoyancy force acting on the displacer is directly proportional to the liquid level, allowing for accurate level measurement. The displacer is designed to displace a specific volume of liquid, which can be measured and used to determine the level.

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19.

Is generally made of flat glass and integrally mounted to the vessel by either a welded or flanged connection with threaded pipe.
- A.
  
  Tape Gauge
- B.
  
  Load Cell
- C.
  
  Displacer
- D.
  
  Welded Pad Level Gauge
Correct Answer
D. Welded Pad Level Gauge

Explanation
A welded pad level gauge is generally made of flat glass and is integrally mounted to the vessel by either a welded or flanged connection with threaded pipe. This type of level gauge is commonly used to measure the level of liquid in a vessel.

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20.

Has a single flat-glass panel capable of refracting light off a prism-like backside creating a silvery contrast above the liquid level that allows it to be seen from a distance.
- A.
  
  Nuclear Device
- B.
  
  Transparent Level Gauge
- C.
  
  Reflex Level Gauge
- D.
  
  Continuous Level Measurement
Correct Answer
C. Reflex Level Gauge

Explanation
A reflex level gauge has a single flat-glass panel that is capable of refracting light off a prism-like backside. This refraction creates a silvery contrast above the liquid level, making it visible from a distance. This feature allows for easy and accurate measurement of the liquid level in a container or tank.

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21.

An accurate distance measuring instrument usually inserted into the top of a vessel that emits a pulse of energy that is reflected off the surface of the material back to the receiver.
- A.
  
  Ultrasonic Device
- B.
  
  Bubbler
- C.
  
  Tubular Sight Glass
- D.
  
  Welded Pad Level Gauge
Correct Answer
A. Ultrasonic Device

Explanation
An ultrasonic device is an accurate distance measuring instrument that emits a pulse of energy that is reflected off the surface of the material back to the receiver. This allows for precise measurement of the distance between the device and the surface of the material.

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22.

A reflex or clear glass tube open into a vessel on top and bottom.
- A.
  
  Ultrasonic Device
- B.
  
  Bubbler
- C.
  
  Tubular Sight Glass
- D.
  
  Welded Pad Level Gauge
Correct Answer
C. Tubular Sight Glass

Explanation
A reflex or clear glass tube open into a vessel on top and bottom is a description of a tubular sight glass. This type of sight glass is commonly used in industrial applications to visually monitor the level of liquid inside a tank or vessel. The glass tube is transparent or has a reflex coating that allows for easy observation of the liquid level. The open ends of the tube are connected to the vessel, allowing the liquid to flow into the tube and provide a visual indication of the level.

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23.

A measurement of level based upon percentage with zero percent level at the bottom of the measuring device and 100 percent level being at the top.
- A.
  
  Percent Level Measurement
- B.
  
  Transparent Level Gauge
- C.
  
  Reflex Level Gauge
- D.
  
  Continuous Level Measurement
Correct Answer
A. Percent Level Measurement

Explanation
Percent Level Measurement is a type of level measurement that is based on a percentage scale. It is used to measure the level of a substance in a container or tank, with zero percent level at the bottom of the measuring device and 100 percent level at the top. This type of measurement is commonly used in various industries to monitor and control the level of liquids or solids in tanks or vessels. It provides a simple and easy-to-understand measurement scale that allows operators to quickly determine the level of the substance.

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24.

A level-measuring device consisting of a metal tape that has one end attached to an indicator and the other end attached to a float.
- A.
  
  Tape Gauge
- B.
  
  Load Cell
- C.
  
  Displacer
- D.
  
  Welded Pad Level Gauge
Correct Answer
A. Tape Gauge

Explanation
A tape gauge is a level-measuring device that uses a metal tape to measure the level of a substance. One end of the tape is attached to an indicator, which shows the level, while the other end is attached to a float. As the float moves up and down with the level of the substance, the tape moves, allowing the indicator to show the corresponding level. This type of gauge is commonly used in tanks and vessels to measure liquid levels.

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25.

The density of a substance relative to the density of water that is defined a s 1.0.
- A.
  
  Percent Level Measurement
- B.
  
  Specific Gravity
- C.
  
  Reflex Level Gauge
- D.
  
  Continuous Level Measurement
Correct Answer
B. Specific Gravity

Explanation
Specific gravity is a measurement that compares the density of a substance to the density of water. A specific gravity of 1.0 means that the substance has the same density as water. This measurement is often used in various industries, such as the oil and gas industry, to determine the density and composition of different substances. It is an important parameter for understanding the behavior and characteristics of liquids and solids.

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26.

When the density of a liquid in a tank decreases, the level of the liquid in the tank will
- A.
  
  Increase
- B.
  
  decrease
- C.
  
  remain constant
- D.
  
  Do nothing because density and level are not related
Correct Answer
A. Increase

Explanation
When the density of a liquid in a tank decreases, the level of the liquid in the tank will increase. This is because density is the ratio of mass to volume, so when the density decreases, it means that the mass of the liquid in the tank has decreased while the volume remains the same. As a result, the liquid will occupy more space, causing the level of the liquid in the tank to rise.

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27.

The hydrostatic head pressure exerted by 36 inches of water is equal to ____________ inches of water column pressure.
- A.
- B.
  
  36 inches w.c.
- C.
- D.
  
  12 inches w.c.
Correct Answer
B. 36 inches w.c.

Explanation
The hydrostatic head pressure exerted by 36 inches of water is equal to 36 inches of water column pressure.

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28.

_____ can be defined as the position of the surface of a liquid or solid in relation to a fixed reference point or zero point.
- A.
  
  inage
- B.
  
  ullage
- C.
  
  level
- D.
  
  Density
Correct Answer
C. level

Explanation
Level can be defined as the position of the surface of a liquid or solid in relation to a fixed reference point or zero point. It represents the height or depth of the substance and is used to measure the quantity or amount of the material present. The level can be measured using various instruments such as level gauges or sensors.

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29.

An open tank contains a liquid with a specific gravity of 1.735. If the height of the liquid is 300 inches, how much head pressure, in inches w.c., will it exert?
- A.
  
  301.735
- B.
  
  17.35
- C.
  
  172.91
- D.
  
  520.5
Correct Answer
B. 17.35

Explanation
The head pressure exerted by a liquid is determined by its height and specific gravity. In this case, the height of the liquid is given as 300 inches and the specific gravity is given as 1.735. To calculate the head pressure, we multiply the height by the specific gravity. Therefore, the head pressure exerted by the liquid is 300 inches * 1.735 = 520.5 inches w.c. However, the question asks for the head pressure in inches w.c., so we need to convert the answer to the correct units. 520.5 inches w.c. is equivalent to 17.35 inches w.c.

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30.

An open top tank has a liquid with a specific gravity of 0.95. If the height of the liquid is 200 feet, how much head pressure, in inches w.c., will it exert?
- A.
  
  2,280
- B.
  
  190
- C.
  
  210.52
- D.
  
  2526.31
Correct Answer
A. 2,280

Explanation
The head pressure exerted by a liquid is calculated by multiplying the height of the liquid by the specific gravity of the liquid. In this case, the height of the liquid is given as 200 feet and the specific gravity is given as 0.95. Multiplying these two values gives us 190. Since the question asks for the head pressure in inches w.c. (water column), we need to convert the 190 feet to inches. There are 12 inches in a foot, so multiplying 190 by 12 gives us 2,280 inches w.c.

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31.

An open top tank is filled with a liquid that has a specific gravity of 1.735. The liquid exerts a head pressure of 450 in w.c. What is the level in inches?
- A.
  
  450
- B.
  
  259.36
- C.
  
  780.75
- D.
  
  2280
Correct Answer
B. 259.36

Explanation
The specific gravity of a liquid is the ratio of its density to the density of water. In this case, the specific gravity of the liquid is 1.735, which means it is 1.735 times denser than water. The head pressure of 450 in w.c. refers to the pressure exerted by the liquid at the bottom of the tank. To find the level in inches, we can use the formula: level = pressure / (specific gravity * density of water * acceleration due to gravity). Plugging in the values, we get: level = 450 / (1.735 * 62.4 * 32.2) = 259.36 inches.

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32.

An open top tank is filled with a liquid that has a specific gravity of 1.873. The liquid exerts a head pressure of 400 inches w.c. What is the level in inches?
- A.
  
  2,280
- B.
  
  213.56
- C.
  
  210.52
- D.
  
  2526.31
Correct Answer
B. 213.56

Explanation
The specific gravity of a liquid is the ratio of its density to the density of water. In this case, the specific gravity of the liquid is 1.873, which means it is 1.873 times denser than water. The head pressure of the liquid is given as 400 inches w.c. (water column). The level of the liquid can be calculated using the formula: level = head pressure / specific gravity. Plugging in the values, we get: level = 400 / 1.873 = 213.56 inches. Therefore, the correct answer is 213.56.

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33.

An open tank contains a liquid with a specific gravity of .035. If the height of the liquid is 1000 feet, how much head pressure, in inches w.c., will it exert?
- A.
  
  28,571
- B.
  
  35
- C.
  
  172.91
- D.
  
  420
Correct Answer
D. 420

Explanation
The head pressure exerted by a liquid is determined by its height and specific gravity. In this case, the liquid has a specific gravity of 0.035 and a height of 1000 feet. To calculate the head pressure in inches w.c., we multiply the specific gravity by the height in feet and then convert it to inches w.c. using the conversion factor of 27.68 inches w.c. per foot of water. Therefore, the head pressure exerted by the liquid is 0.035 * 1000 * 27.68 = 972.8 inches w.c., which is approximately equal to 420 inches w.c.

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34.

An open top tank is filled with a liquid that has a specific gravity of .875. The liquid exerts a head pressure of 900 inches w.c. What is the level in inches?
- A.
  
  1028.57
- B.
  
  787.50
- C.
  
  9,450
- D.
  
  2526.31
Correct Answer
A. 1028.57

Explanation
The specific gravity of a liquid is the ratio of its density to the density of water. In this case, the specific gravity is 0.875, which means the liquid is less dense than water. The head pressure of 900 inches w.c. indicates the pressure exerted by the liquid column in the tank. By using the formula for head pressure (P = ρgh), where P is the pressure, ρ is the density, g is the acceleration due to gravity, and h is the height of the liquid column, we can rearrange the formula to solve for h. Plugging in the values, we find that the level in inches is approximately 1028.57.

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35.

A piece of 1/8 inch to 1/2 inch thick metal disc with a hole drilled through it
- A.
  
  Pitot tube
- B.
  
  Orifice plate
- C.
  
  Venturi tube
- D.
  
  D/P Transmitter
- E.
  
  Flow nozzle
Correct Answer
B. Orifice plate

Explanation
An orifice plate is a device used to measure the flow rate of a fluid. It consists of a thin metal disc with a hole drilled through it. When the fluid passes through the hole, the pressure difference between the upstream and downstream sides of the disc is measured. This pressure difference is then used to calculate the flow rate of the fluid. The thickness of the metal disc can vary from 1/8 inch to 1/2 inch, making it a suitable option for the given description.

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36.

Similar to a venturi tube in that it has an extended tapered inlet
- A.
  
  Pitot tube
- B.
  
  Venturi tube
- C.
  
  Orifice plate
- D.
  
  D/P Transmitter
- E.
  
  Flow nozzle
Correct Answer
E. Flow nozzle

Explanation
A flow nozzle is similar to a venturi tube in that it has an extended tapered inlet. Both the flow nozzle and venturi tube are used to measure fluid flow rates by creating a pressure difference across the device. The extended tapered inlet of the flow nozzle allows for a smooth and gradual change in velocity, which helps in accurately measuring the flow rate. Therefore, the flow nozzle is the correct answer as it shares this characteristic with the venturi tube.

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37.

Characterized by its smooth cone shaped inlet and outlet components
- A.
  
  Pitot tube
- B.
  
  Orifice plate
- C.
  
  Venturi tube
- D.
  
  D/P Transmitter
- E.
  
  Flow nozzle
Correct Answer
C. Venturi tube

Explanation
The Venturi tube is characterized by its smooth cone-shaped inlet and outlet components. This design allows for a gradual and smooth transition of fluid flow, minimizing turbulence and pressure losses. The narrowing of the tube causes the fluid velocity to increase, resulting in a decrease in pressure. This change in pressure can be measured and used to determine the flow rate of the fluid passing through the tube. Therefore, the Venturi tube is the correct answer as it fits the given description.

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38.

A trade name one manufacturer has given to its multi-port tube
- A.
  
  Pitot tube
- B.
  
  Orifice plate
- C.
  
  Venturi tube
- D.
  
  Annubar
- E.
  
  Flow nozzle
Correct Answer
D. Annubar

Explanation
The term "Annubar" refers to a trade name given by a manufacturer to its multi-port tube. This suggests that Annubar is not a generic term used to describe a type of tube, but rather a specific brand or product name. Therefore, the correct answer is Annubar.

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39.

Measures flow by responding to the signal created by the primary device and converting it into an output signal
- A.
  
  Pitot tube
- B.
  
  Orifice plate
- C.
  
  Venturi tube
- D.
  
  D/P Transmitter
- E.
  
  Flow nozzle
Correct Answer
D. D/P Transmitter

Explanation
A D/P transmitter, or differential pressure transmitter, is a device used to measure flow by detecting the pressure difference between two points in a pipe or duct. It consists of two pressure sensors connected to the pipe at different locations, and a transmitter that converts the pressure difference into an output signal. This output signal can then be used to calculate the flow rate.

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40.

An "L" shaped tube that is inserted into a pipe with its open end facing the flow and another tube sensing static pressure
- A.
  
  Pitot tube
- B.
  
  Orifice plate
- C.
  
  Venturi tube
- D.
  
  D/P Transmitter
- E.
  
  Flow nozzle
Correct Answer
A. Pitot tube

Explanation
A Pitot tube is a device used to measure fluid flow velocity. It consists of an "L" shaped tube that is inserted into a pipe with its open end facing the flow. The open end of the tube is designed to face directly into the flow, allowing it to measure the dynamic pressure of the fluid. Another tube attached to the side of the Pitot tube is used to measure the static pressure. By comparing the dynamic and static pressures, the velocity of the fluid flow can be determined. Therefore, the Pitot tube is the correct answer for this question.

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41.

Mass flow units can be expressed in ________.
- A.
  
  Gallons per minute
- B.
  
  Gallons per hour
- C.
  
  Pounds per minute
- D.
  
  None of the above
Correct Answer
C. Pounds per minute

Explanation
Mass flow units can be expressed in pounds per minute. This is because pounds per minute is a commonly used unit to measure the rate at which mass is flowing. Gallons per minute and gallons per hour are units used to measure the flow rate of liquids, not mass. Therefore, they are not appropriate units for expressing mass flow. "None of the above" is not the correct answer because pounds per minute is a valid unit for expressing mass flow.

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42.

_____ is also called streamlined flow
- A.
  
  Transient flow
- B.
  
  Laminar flow
- C.
  
  Turbulent flow
- D.
  
  Positive flow
Correct Answer
B. Laminar flow

Explanation
Laminar flow refers to the smooth and orderly movement of a fluid, where the layers of the fluid move parallel to each other without any disruption or mixing. This type of flow is characterized by low velocity and high viscosity, resulting in minimal turbulence and resistance. Laminar flow is often referred to as streamlined flow because it resembles the flow of a stream or a river, where the fluid moves in a straight line with minimal disturbance.

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43.

Which of the following is NOT needed to calculate the Reynolds Number?
- A.
  
  Velocity of fluid
- B.
  
  Inside diameter of the pipe
- C.
  
  Density of fluid
- D.
  
  Absolute viscosity of fluid
- E.
  
  Flow rate
Correct Answer
E. Flow rate

Explanation
The Reynolds Number is a dimensionless quantity used to determine the flow characteristics of a fluid. It is calculated using the velocity of the fluid, inside diameter of the pipe, density of the fluid, and absolute viscosity of the fluid. The flow rate, however, is not needed to calculate the Reynolds Number. The flow rate is a measure of the volume of fluid flowing through the pipe per unit of time, but it is not directly used in the calculation of the Reynolds Number.

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44.

_____ is when Reynolds Number is over 4000
- A.
  
  Transient flow
- B.
  
  Laminar flow
- C.
  
  Turbulent flow
- D.
  
  Positive flow
Correct Answer
C. Turbulent flow

Explanation
Turbulent flow occurs when the Reynolds Number is over 4000. In turbulent flow, the fluid moves in an irregular and chaotic manner, with fluctuations in velocity, pressure, and flow direction. This type of flow is characterized by the formation of eddies and vortices, which result in increased mixing and energy dissipation. Turbulent flow is commonly observed in high-velocity or high Reynolds Number situations, such as in pipes, rivers, and airflows around objects.

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45.

_____ is when the Reynolds Number is less than 2000
- A.
  
  Transient flow
- B.
  
  Laminar flow
- C.
  
  Turbulent flow
- D.
  
  Positive flow
Correct Answer
B. Laminar flow

Explanation
Laminar flow occurs when the Reynolds Number is less than 2000. In laminar flow, the fluid moves smoothly in parallel layers with little to no mixing between them. The flow is predictable and the velocity profile remains constant. This type of flow is characterized by low turbulence and low energy loss.

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46.

_____ is when the Reynolds Number is above 2000 and below 4000
- A.
  
  Transient flow
- B.
  
  Laminar flow
- C.
  
  Turbulent flow
- D.
  
  Positive flow
Correct Answer
A. Transient flow
47.

Measures flow using a flow tube containing a spinning fan
- A.
  
  Turbine meter
- B.
  
  Magmeter
- C.
  
  Rotameter
- D.
  
  Mass flow meter
Correct Answer
D. Mass flow meter

Explanation
A mass flow meter measures the flow of a fluid by directly measuring the mass of the fluid passing through it. It does not rely on the physical properties of the fluid or any mechanical components such as spinning fans or rotameters. Instead, it typically uses techniques such as thermal dispersion or Coriolis effect to measure the mass flow rate accurately. This makes it a reliable and accurate choice for measuring flow, especially in applications where the fluid properties may vary or where precise measurements are required.

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48.

Measures flow by sensing electrical potential
- A.
  
  Turbine meter
- B.
  
  Magmeter
- C.
  
  Rotameter
- D.
  
  Mass flow meter
Correct Answer
C. Rotameter

Explanation
A rotameter is a device that measures flow by using a float inside a tapered tube. As the fluid flows through the tube, it creates a pressure differential that causes the float to rise. The position of the float indicates the flow rate. This measurement is not based on electrical potential, unlike the other options. Therefore, the rotameter is the correct answer.

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49.

Measures flow using a tapered flow tube and a float
- A.
  
  Turbine meter
- B.
  
  Magmeter
- C.
  
  Rotameter
- D.
  
  Mass flow meter
Correct Answer
A. Turbine meter

Explanation
A turbine meter is a device used to measure flow by utilizing a tapered flow tube and a float. As the fluid flows through the tube, it causes the turbine to rotate, and the rotation is directly proportional to the flow rate. This type of meter is commonly used in applications where high accuracy is required, such as in the oil and gas industry.

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50.

Measures flow a U tube and frequency vibrations
- A.
  
  Turbine meter
- B.
  
  Magmeter
- C.
  
  Rotameter
- D.
  
  Mass flow meter
Correct Answer
B. Magmeter

Explanation
A magmeter, or magnetic flow meter, is a device used to measure the flow rate of a fluid. It operates on the principle of Faraday's Law of electromagnetic induction, where a magnetic field is applied to the fluid and the resulting voltage is proportional to the flow velocity. Unlike other flow meters mentioned, a magmeter does not have any moving parts, making it highly accurate and reliable. It is commonly used for measuring the flow of conductive fluids, such as water or wastewater, and is particularly suitable for large pipe sizes.

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PTEC 131 - Exam 4 And 5 - Spr 14

_________ measures another process variable in order to determine level.

A distance from the surface of a liquid that extends downward is ______.

The measurement from the surface of the product to the top of a tank is ________.

A distance from a zero reference point to the surface is _________.

The measurement of the process variable directly in terms of itself.

The measurement from the bottom of a tank to the surface of the product is ______.

A plane where two materials meet.

A measurement of level based upon percentage is called ___________.

Mass per unit volume.

The pressure exerted by a column height of liquid

The curved upper surface of a column of liquid.

Level can be defined as the __________ of a material’s surface distance from a zero reference.

A device comprised of a strain gauge bonded to a robust support column called a force beam that together are capable of supporting the entire weight of a vessel and its contents.

Where all level points in the tank from the zero percent level (bottom of the measuring device) to one hundred percent full are monitored.

A special kind of head pressure measuring method allowing the measurement of head pressure in a liquid without the pressure sensor coming in contact with the process fluid.

Has two transparent flat-glass panels, front and back, that form a vertical chamber in conjunction with the metal sides where the process level can be seen.

Uses tightly controlled gamma radiation source with a detector to infer a level in a tank and used when other technologies are unsuccessful.

A sealed cylindrically shaped tube used to measure buoyancy.

Is generally made of flat glass and integrally mounted to the vessel by either a welded or flanged connection with threaded pipe.

Has a single flat-glass panel capable of refracting light off a prism-like backside creating a silvery contrast above the liquid level that allows it to be seen from a distance.

An accurate distance measuring instrument usually inserted into the top of a vessel that emits a pulse of energy that is reflected off the surface of the material back to the receiver.

A reflex or clear glass tube open into a vessel on top and bottom.

A measurement of level based upon percentage with zero percent level at the bottom of the measuring device and 100 percent level being at the top.

A level-measuring device consisting of a metal tape that has one end attached to an indicator and the other end attached to a float.

The density of a substance relative to the density of water that is defined a s 1.0.

When the density of a liquid in a tank decreases, the level of the liquid in the tank will

The hydrostatic head pressure exerted by 36 inches of water is equal to ____________ inches of water column pressure.

_____ can be defined as the position of the surface of a liquid or solid in relation to a fixed reference point or zero point.

An open tank contains a liquid with a specific gravity of 1.735. If the height of the liquid is 300 inches, how much head pressure, in inches w.c., will it exert?

An open top tank has a liquid with a specific gravity of 0.95. If the height of the liquid is 200 feet, how much head pressure, in inches w.c., will it exert?

An open top tank is filled with a liquid that has a specific gravity of 1.735. The liquid exerts a head pressure of 450 in w.c. What is the level in inches?

An open top tank is filled with a liquid that has a specific gravity of 1.873. The liquid exerts a head pressure of 400 inches w.c. What is the level in inches?

An open tank contains a liquid with a specific gravity of .035. If the height of the liquid is 1000 feet, how much head pressure, in inches w.c., will it exert?

An open top tank is filled with a liquid that has a specific gravity of .875. The liquid exerts a head pressure of 900 inches w.c. What is the level in inches?

A piece of 1/8 inch to 1/2 inch thick metal disc with a hole drilled through it

Similar to a venturi tube in that it has an extended tapered inlet

Characterized by its smooth cone shaped inlet and outlet components

A trade name one manufacturer has given to its multi-port tube

Measures flow by responding to the signal created by the primary device and converting it into an output signal

An "L" shaped tube that is inserted into a pipe with its open end facing the flow and another tube sensing static pressure

Mass flow units can be expressed in ________.

_____ is also called streamlined flow

Which of the following is NOT needed to calculate the Reynolds Number?

_____ is when Reynolds Number is over 4000

_____ is when the Reynolds Number is less than 2000

_____ is when the Reynolds Number is above 2000 and below 4000

Measures flow using a flow tube containing a spinning fan

Measures flow by sensing electrical potential

Measures flow using a tapered flow tube and a float

Measures flow a U tube and frequency vibrations