For a pneumatic control system, it is imperative that
a. The maximum transmitter output signal pressure be maintained
b. The air supply is kept clean and dry
c. The control systems have built-in redundancy
d. The compressed air supply remains above 1725 kPa
e. The control devices are fitted with noise attenuators
Answer: B
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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:
- A device which will cause a visible light signal to become an instrument analog signal is the:
- An open loop control system requires:
- 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: