Process Control Quiz Questions With Answers
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Do you understand process control? You can test your knowledge with these process control quiz questions with answers. When you have completed this unit, you will be able to identify each component of the Process Control Training System. You will also be able to set up and operate a basic flow circuit using the Process Control Training System. So, it is a kind of practice test for you before working on it practically. All the best, and ace the quiz.
Questions and Answers
- 1.
The reason process control is so popular is the increased.
- A.
Safety
- B.
Profitability
- C.
Operability
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
Process control is popular because it offers benefits in terms of safety, profitability, and operability. By implementing process control, companies can ensure the safety of their operations by monitoring and controlling various parameters to prevent accidents and hazards. Additionally, process control helps optimize processes, leading to increased profitability by reducing waste, improving efficiency, and maximizing production output. Moreover, process control enhances operability by providing real-time data and control capabilities, allowing operators to make informed decisions and quickly respond to changes in the process. Therefore, all of these factors contribute to the popularity of process control.Rate this question:
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- 2.
Process control can be achieved either in the _____ or closed-loop mode.
Correct Answer
openExplanation
Process control can be achieved either in the open or closed-loop mode. In the open-loop mode, the control system does not receive feedback from the process being controlled. It simply sends commands or inputs to the process based on a predetermined set of instructions. This mode is commonly used when the process is simple and does not require constant monitoring or adjustment. In contrast, the closed-loop mode involves the use of feedback from sensors to continuously monitor the process and make adjustments as needed. This mode is more commonly used in complex processes where accuracy and stability are critical.Rate this question:
- 3.
The _________ is the desired value of the variable being controlled. The setpoint may be set manually or automatically, or the operator may program it.
Correct Answer
setpointExplanation
The setpoint is the desired value of the variable being controlled. It can be set manually or automatically, or programmed by the operator.Rate this question:
- 4.
The _________ (2 words) is a device that manipulates a variable that has a direct influence on the controlled variable.
Correct Answer
control elementExplanation
A control element is a device that is used to manipulate a variable which directly affects the controlled variable. It is responsible for making adjustments or changes to the controlled variable in order to maintain a desired outcome or setpoint. The control element can be a physical device, such as a valve or a motor, or it can be a software component in a control system. Its purpose is to ensure that the controlled variable remains within a specified range or target value by adjusting the variable that has an impact on it.Rate this question:
- 5.
_____________ are varying conditions that cause the controlled variable to differ from the setpoint.
Correct Answer
Disturbances
disturbancesExplanation
Disturbances refer to varying conditions that can cause the controlled variable to deviate from the setpoint. These conditions can be external factors or internal changes within the system that disrupt the desired state. By understanding and managing disturbances, control systems can adjust and maintain the controlled variable closer to the setpoint, ensuring stability and optimal performance.Rate this question:
- 6.
The __________ is an operation or sequence of operations involving a change in the controlled variable.
Correct Answer
processExplanation
The term "process" refers to an operation or sequence of operations that brings about a change in the controlled variable. It implies a series of steps or actions that are undertaken to achieve a desired outcome or result. In the context of this question, the process is the means by which the controlled variable is altered or modified. It could involve various actions, procedures, or methods that are followed to bring about the desired change.Rate this question:
- 7.
The _______________ (2 words) is a function of the manipulated variable and the disturbances.
Correct Answer
controlled variableExplanation
The controlled variable is a function of the manipulated variable and the disturbances. In a control system, the controlled variable refers to the quantity or condition that is being regulated or controlled. It is influenced by both the manipulated variable, which is the input or action taken to control the system, and the disturbances, which are external factors that can affect the system's behavior. The controlled variable is the output of the system and its value is determined by the interaction between the manipulated variable and the disturbances.Rate this question:
- 8.
The _______________ contains a sensing element that measures the actual value of the controlled variable and generates a proportional signal which is sent back to the controller.
Correct Answer
feedback loopExplanation
A feedback loop is a system component that includes a sensing element to measure the actual value of the controlled variable. It then generates a proportional signal that is sent back to the controller. This allows the controller to continuously monitor and adjust the controlled variable based on the feedback received, ensuring that it stays at the desired value. The feedback loop plays a crucial role in maintaining stability and accuracy in control systems.Rate this question:
- 9.
The disadvantage of the closed-loop mode is that the actual value of the controlled variable is not taken into account. If disturbances cause the controlled variable to deviate from the setpoint, no countermeasure is taken to correct for the deviations.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
It is the open-loop mode that does not take the actual value of the controlled variable into account as there is no feedback loop.Rate this question:
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- 10.
When many variables must be controlled simultaneously, this is known as ________________
Correct Answer
multiloop control
Multiloop controlExplanation
When many variables must be controlled simultaneously, this is known as multiloop control. Multiloop control refers to a control system that involves multiple feedback loops, where each loop is responsible for controlling a specific variable. This approach allows for more precise and efficient control of complex systems by considering the interdependencies between different variables. By implementing multiloop control, it becomes possible to optimize the overall performance of the system and ensure that all variables are maintained within desired ranges.Rate this question:
- 11.
The measure of acidity or alkalinity:
Correct Answer
pH
phExplanation
The measure of acidity or alkalinity is pH, which stands for "potential of hydrogen". It is a scale ranging from 0 to 14, with 7 being neutral. A pH value below 7 indicates acidity, while a value above 7 indicates alkalinity. The lowercase "ph" is incorrect as it is not the standard abbreviation for pH.Rate this question:
- 12.
The set of devices used to measure, record, and control industrial processes.
- A.
Primary sensing elements
- B.
Indicators
- C.
Transmitters
- D.
Process Instrumentation
Correct Answer
D. Process InstrumentationExplanation
Process instrumentation refers to the set of devices used in industrial processes to measure, record, and control various parameters. These devices include primary sensing elements, which directly sense the process variables, indicators that display the measured values, and transmitters that transmit the measured data to a control system. Process instrumentation plays a crucial role in ensuring the efficiency, safety, and reliability of industrial processes by providing accurate and real-time data for monitoring and control purposes.Rate this question:
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- 13.
Transmitters use _______________________ as analog controller signals
- A.
Voltage
- B.
Resistance
- C.
Hydraulic Pressure
- D.
All of the above
Correct Answer
A. VoltageExplanation
Voltage, current, and air pressure are the three analog controller signals.Rate this question:
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- 14.
ISA stands for:
- A.
Industrial Safety Authority
- B.
Industrial Safety Act
- C.
Industrial Standards Association
- D.
Instrument Society of America
Correct Answer
D. Instrument Society of AmericaExplanation
ISA stands for Instrument Society of America. This organization is a global, nonprofit professional association that sets standards and provides education and training in the field of automation and control systems. The society focuses on promoting the understanding and application of instrumentation and automation technologies in various industries. The other options, Industrial Safety Authority, Industrial Safety Act, and Industrial Standards Association, do not accurately represent the acronym ISA in this context.Rate this question:
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- 15.
Indicates the function and nature of a component represented. It is composed of letters and numbers:
Correct Answer
tag number
Tag numberExplanation
The term "tag number" refers to a combination of letters and numbers that is used to identify and represent the function and nature of a component. This alphanumeric code helps in categorizing and organizing different components, making it easier to locate and understand their purpose. By using a tag number, individuals can quickly identify and refer to specific components without confusion or ambiguity.Rate this question:
- 16.
The primary purpose of process control is to maintain some _______
- A.
Physical Variable
- B.
Analog Variable
- C.
Input Variable
- D.
Digital Variable
Correct Answer
A. Physical VariableExplanation
The primary purpose of process control is to maintain some physical variable. Process control is used to regulate and maintain specific physical parameters such as temperature, pressure, flow rate, or level within a system or process. By monitoring and adjusting these physical variables, process control ensures that the desired conditions are met and maintained, leading to efficient and effective operation of the process.Rate this question:
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- 17.
The controller compares the setpoint to the measured variable and corrects for any difference between the two by readjusting the control element until the loop reaches a state of equilibrium called _______________
Correct Answer
steady stateExplanation
The controller in a control loop continuously compares the setpoint (desired value) to the measured variable (actual value) and makes adjustments to the control element to minimize the difference between the two. This process continues until the loop reaches a state of equilibrium where the setpoint and measured variable are equal, known as the steady state. In this state, the controller no longer needs to make corrections as the system is operating as desired.Rate this question:
- 18.
Why do we use a current of 4 to 20 mA for analog controller signals rather than 0 to 20 mA?
- A.
It allows transmitter devices to be powered by the same loop, as we always have at least 4 mA.
- B.
0 mA allows us to detect some failures in the loop.
- C.
Both of the above.
- D.
None of the above
Correct Answer
C. Both of the above.Explanation
A current range of 4 to 20 mA is used for analog controller signals because it allows transmitter devices to be powered by the same loop, as there is always a minimum current of 4 mA. This ensures that the devices receive sufficient power for operation. Additionally, a 0 mA current allows us to detect failures in the loop, as any deviation from the expected current range indicates a fault or malfunction. Therefore, both of these reasons justify the use of a current range of 4 to 20 mA for analog controller signals.Rate this question:
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Current Version
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Aug 18, 2023Quiz Edited by
ProProfs Editorial Team -
Sep 06, 2012Quiz Created by
DavidFitzpatrick
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