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Questions and Answers
The variable which is adjusted manually or by means of control mechanism is called_______.
The variable which is adjusted manually or by means of control mechanism is called_______.
Identify this symbol.
Identify this symbol.
In flow control loop, the range of the flow rate is given as 0 LPH to 100 LPH. The 75 LPH flow rate corresponds to ________ of current.
In flow control loop, the range of the flow rate is given as 0 LPH to 100 LPH. The 75 LPH flow rate corresponds to ________ of current.
In 4-20 mA current signal, 4 mA current represents_____________ value.
In 4-20 mA current signal, 4 mA current represents_____________ value.
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The basic function of an electronic transmitter is to
The basic function of an electronic transmitter is to
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Which of the following accessory can be used in the installation of DPT for flow rate measurement?
Which of the following accessory can be used in the installation of DPT for flow rate measurement?
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In level measurement, zero elevation is necessary when
In level measurement, zero elevation is necessary when
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Manifold is __________
Manifold is __________
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In liquid pressure control loop, _______________ control action is recommended.
In liquid pressure control loop, _______________ control action is recommended.
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In on-off control mode, to avoid cycling behavior of the controller _________ is purposely provided.
In on-off control mode, to avoid cycling behavior of the controller _________ is purposely provided.
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Suppose a process error lies within the neutral zone with P= 25%. At t=0, the error falls below the neutral zone. If K= 2% per second, find the time when the output saturates.
Suppose a process error lies within the neutral zone with P= 25%. At t=0, the error falls below the neutral zone. If K= 2% per second, find the time when the output saturates.
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If the critical gain is 26, what is the proportional gain of a single-mode controller?
If the critical gain is 26, what is the proportional gain of a single-mode controller?
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In quarter amplitude decay ratio, if the magnitude of the first overshoot is 16, what is the magnitude of the second overshoot?
In quarter amplitude decay ratio, if the magnitude of the first overshoot is 16, what is the magnitude of the second overshoot?
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Setting the optimum values of proportional gain, integral time, and derivative gain in a PID controller to improve its performance is called _______________ of the controller.
Setting the optimum values of proportional gain, integral time, and derivative gain in a PID controller to improve its performance is called _______________ of the controller.
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A 9% change in the controlling variable causes a 3.9% change in the controlled variable in 4.8 minutes. Determine the process reaction rate.
A 9% change in the controlling variable causes a 3.9% change in the controlled variable in 4.8 minutes. Determine the process reaction rate.
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Identify the experimental step to implement the Z-N open loop method of controller tuning.
Identify the experimental step to implement the Z-N open loop method of controller tuning.
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In a power plant, pressure control loop no. 071 uses a current to pressure converter as one of the components, the actuator used in this loop is __________.
In a power plant, pressure control loop no. 071 uses a current to pressure converter as one of the components, the actuator used in this loop is __________.
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Which characteristic gives good control and high rangeability?
Which characteristic gives good control and high rangeability?
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Which of the following is part of the trim in a control valve?
Which of the following is part of the trim in a control valve?
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Which valve is a rotary type of control valve?
Which valve is a rotary type of control valve?
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The U.S. number of gallons of water that passes through a fully open valve in one minute with a pressure drop of 1 psi across it at 60°F is called_________.
The U.S. number of gallons of water that passes through a fully open valve in one minute with a pressure drop of 1 psi across it at 60°F is called_________.
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Which of the following components improve the performance of a control valve?
Which of the following components improve the performance of a control valve?
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Which of the following is a pressure-reducing device?
Which of the following is a pressure-reducing device?
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Study Notes
Process Control Loop Components
- The variable that is adjusted manually or by means of a control mechanism is called the manipulated variable.
- Set point value is the desired value of the controlled variable.
Signal Lines
- The symbol for pneumatic signal line.
Flow Control Loop
- In a flow control loop, a flow rate of 75 LPH corresponds to a 75% current signal.
4-20 mA Current Signal
- In a 4-20 mA current signal, 4 mA represents 0% value and 20 mA represents 100% value.
Electronic Transmitter
- The basic function of an electronic transmitter is to respond to a measurand and convert it into a 4-20mA signal.
Installation of DPT
- An impulse line, manifold valve, and orifice plate can be used as accessories in the installation of a DPT for flow rate measurement.
Level Measurement
- Zero elevation is necessary when the pressure on both sides of the transmitter are equal.
Manifold
- A manifold is a type of valve.
Control Actions
- Proportional-integral control action is recommended for liquid pressure control loops.
- In on-off control mode, a dead time is purposely provided to avoid cycling behavior of the controller.
Controller Tuning
- The tuning of a controller involves setting the optimum values of proportional gain, integral time, and derivative gain to improve its performance.
Quarter Amplitude Decay Ratio
- In a quarter amplitude decay ratio, the magnitude of the first overshoot is four times the magnitude of the second overshoot.
Process Reaction Rate
- The process reaction rate can be calculated from the percentage change in the controlling variable and the corresponding change in the controlled variable.
Z-N Open Loop Method
- The experimental step to implement the Z-N open loop method of controller tuning involves discontinuing the controller output from the final control element.
Actuator
- A pneumatic type actuator is used in pressure control loop no. 071.
Control Valve Characteristics
- Equal percentage characteristics give good control and high rangeability.
Control Valve Components
- The closure member is part of the trim in a control valve.
Valve Types
- A butterfly valve is a type of rotary control valve.
Control Valve Coefficient
- The control valve coefficient is the U.S. number of gallons of water that passes through a fully open valve in one minute with a pressure drop of 1 psi across it at 60° F.
Control Valve Performance
- A positioner improves the performance of a control valve.
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Description
Test your knowledge of process control loop components with this multiple-choice quiz. Questions cover controlled variables, signal lines, and more.
