An open loop control system requires:
a. A transducer and a recorder
b. More accurate sensing devices
c. A very small amount of dead time or lag
d. Constant operator attention
e. Two final control elements
Answer: D
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Power Engineering Chapter 84
- Which one is NOT an disadvantage of Pneumatic Signals?
- Which one is NOT an advantage of Pneumatic Signals?
- The component of a control system that adjusts the value of the manipulated variable
- Indicates the value of the variable (pressure, level, or flow) being monitored or recorded on a chart for future reference.
- Instantly show the values of different variables to the operators and maintenance personnel.
- The margin by which an automatic controller misses the desired value
- When a process variable has no method of sending information to the final control element the system is known as
- An upset in a plant process is called a/an:
- Pneumatic signals operate between:
- A controller is a device that primarily:
- Automatic systems that can make decisions are termed:
- In an automatic control system, the controller output signal changes the position of the:
- For a pneumatic control system, it is imperative that
- A device which will cause a visible light signal to become an instrument analog signal is the:
- Level, pressure, flow, temperature, composition, vibration, speed and clearance are all examples of:
- A control loop controller:
- The forms commonly used for power-plant equipment control include analog, digital, mechanical, pneumatic and:
- Some of the components of an automatic control loop are a sensing element, a transmitter, a _____ and a control valve.
- A sensing element sends its signal to a:
- A fire eye or flame scanner keeps the burner circuit energized as long as the burner flame is maintained. This is accomplished using a:
- A process variable which is adjusted in order to maintain or achieve some desired value of another variable is termed the:
- A sensing element responds to the value of the
- The apparatus which converts current signals to pneumatic and pneumatic to current signals is called a: