Cascade control utilizes:
a. One controller, one transmitter and two valves.
b. One controller, two transmitters and two valves
c. Two controllers, one transmitter and two valves.
d. Two controllers, two transmitters and two valves.
e. Two controllers, two transmitters and one valve.
Answer: E
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Power Engineering Chapter 86
- A valve actuator
- When a recorder receives a signal from a transmitter, the recorder incorporates a
- A proportional only controller
- The output pressure signal of a transmitter relay is usually
- A flapper-nozzle assembly is basic to all
- On a basic pneumatic transmitter, a movement of the flapper towards nozzle will:
- Putting a controller on manual control means:
- A valve which gives good throttling action, takes less actuator force, but does not seal well is a:
- A proportional-only controller:
- Most solenoid valves operate so that the upstream line pressure will:
- A circular chart recorder:
- A sensing element sends its signal to
- A CRT or LCD display trend recorder
- A CRT trend display:
- A pneumatically actuated control valve which opens on air failure has a:
- A recorder utilizing a spiral Bourdon tube will have a pen movement:
- Normally-closed solenoid operated valves open when
- In a pneumatic control system, the nozzle receives a regulated air supply pressure of approximately:
- A control valve that has one plug that moves upward to close the port is called:
- A two-position controller compares conditions to a set point and:
- Integral and Derivative functions
- When controller output is proportional to the amount of deviation, the controller is:
- A valve body that seals on the down stroke is:
- A proportional controller: