Term
| An open loop-system is not self-correcting. |
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Definition
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| When a disturbance to the manufacturing process occurs in an open loop system, it is necessary to change the command signal to maintain the original controlled variable. |
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Definition
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| In a typical process control system, the set point is constantly changing. |
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Definition
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Term
The flow or energy that is altered by the actuator is
Referred to as the manipulated variable. |
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Definition
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Term
| In some situations, the corrective action of a closed-loop system can be made when the error signal produced by the comparator remains unchanged. |
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Definition
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Term
Another term commonly used for the actuator element is the
final control element. |
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Definition
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Term
| An example of the dynamic response in a closed loop system is the time duration from when a signal passes from one instrument to the next. |
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Definition
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Term
| Feedforward control compensates for immeasurable disturbances. |
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Definition
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Term
| Another term used for the motion control is sequential process. |
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Definition
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Term
| Servomechanisms is a term commonly used for process control. |
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Definition
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Term
| Some open- loop automatic control systems are self-regulating. |
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Definition
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Term
As a disturbance develops in an open- loop system
The error signal increases. |
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Definition
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Term
| The summing junction in a closed-loop industrial control system subtracts the feedback signal from the set point signal. |
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Definition
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Term
| Positive feedback cancels some of the command signal. |
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Definition
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Term
| The terms equilibrium and balance are used to describe a system where the controlled variable is at a state specified by the command signal. |
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Definition
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Term
| A load demand change will alter the value of a controlled variable. |
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Definition
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Term
| The output of the measurement device is the measured variable. |
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Definition
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Term
| A load change is a type of factor that causes the condition of the controlled variable to vary. |
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Definition
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Term
The control variable must deviate from the set point
In an on-off controller to cause controlled action to occur. |
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Definition
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Term
| In some process control applications, a steady state error is required to cause equilibrium in the system. |
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Definition
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Term
| A small steady state error in a position-type motion control system is acceptable. |
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Definition
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Term
| The integral mode is effective in system has which require a fast reason he to the Command signal. |
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Definition
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Term
| A position-type motion control system is in an instability condition when overshoot and oscillations occur. |
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Definition
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Term
| Steady-state error is also referred to as offset. |
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Definition
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Term
| Pressure can be used to measure the height of liquid in a container. |
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Definition
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Term
| The low atmospheric pressure that exists on a stormy day will have a different effect on an open container hydrostatic pressure reading than when a high atmospheric pressure exists on a clear day. |
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Definition
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Term
| In a semiconductor strain gauge pressure sensor, the output is zero volts when no pressure is detected. |
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Definition
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Term
| The altitude at or above sea level must be considered when measuring hydrostatic pressure of a liquid in an open container. |
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Definition
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Term
| A gas can be a vapor, steam, or air from the atmosphere. |
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Definition
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Term
| If a high pressure system is located over Miami Beach the atmospheric pressure may increase above 14.7 psi. |
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Definition
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Term
The output of the measurement device is the___________.
a. Measured variable. c. Neither a or b
b. feedback signal. |
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Definition
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Term
Which elements and signals of a control system do not exist in an open-loop configuration?
a. comparator. d. Feed-back signal
b. error signal. e. All of the above.
c. Measurement device. |
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Definition
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Term
An error signal develops when which of the following conditions occurs?
a. The set point is changed
b. A disturbance appears
c. The load demand varies
d. All of the above. |
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Definition
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Term
The time from when a change is received at the input of an instrument in a closed-loop system until it produces an output is referred to as..
a. Dead time. c. Pure lag
b. Time lag. |
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Definition
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Term
_____________control takes corrective action after a disturbance occurs.
a. Feeforward b. Feedback |
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Definition
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Term
Which of the following terms are also used for the measurement device?
a. Detectors. b. Transducer
c. Sensor. d. All of the e above |
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Definition
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Term
An astable multivibrator produces:
a. One pulse after a signal is applied to the input
b. A continuous square wave after power is applied |
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Definition
| b. A continuous square wave after power is applied |
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Term
Which one of the following conditions can cause a steady-state error to develop?
a. The system gain is too low
b. The system gain is too high
c. The load the actuator is driving is too large.
d. The system responds too fast
e. Both a and c are correct |
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Definition
| e. Both a and c are correct |
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Term
The term___________ is commonly used to describe the height of a liquid in a container above the measuring height.
a. Specific gravity
b. Head
c. Atmosphere
d. Density |
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Definition
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Term
As temperature increases, the density of a liquid________?
a. Increases. c. Stays the same
b. Reduces. |
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Definition
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Term
The hydrostatic pressure created by a liquid in an open container
__________ when it's temperature is increased?
a. Increases
b. Decreases
c. Stays the same |
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Definition
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Term
The Psia pressure reading of an inflated tire is the pressure above___________.
a. Atmospheric pressure
b. A vacuum. |
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Definition
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Term
A Psia reading of zero indicates?
a. The atmospheric pressure at sea level
b.a vacuum |
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Definition
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Term
Which of the following types of measurements can be made by diaphragm gauges?
a. Absolute
b. Gage
c. Differential pressure
d. All of the above |
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Definition
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Term
The power source of hydraulic system is______________.
a. A compressor
b. A pump
c.gravity
d. A boiler |
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Definition
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Term
The span adjustment in the calibration procedure of an instrument is made when the process variable is?
a. In its minimum condition
b. In its maximum condition
c. Anywhere within its full range |
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Definition
| b. In its maximum condition |
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Term
The hydrostatic pressure created by a liquid in a closed container ???????? When it's temperature increases.
a. Increases
b. Decreases
c. Stays the same |
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Definition
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Term
If a confined gas is removed to form a partial vacuum, it's temperature will_____________?
a. Increases
b. Decrease
c. Remain the same |
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Definition
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Term
Pressure varies the value of capacitance in a variable capacitor pressure sensor by changing the ____________?
a. Size of the capacitor plates
b. Dielectric
c. Distance between the plates |
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Definition
| c. Distance between the plates |
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Term
A liquid with a specific gravity that is less than 1 is ________ than water.
a. Lighter
b. Heavier |
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Definition
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