PDC quiz1

A controller is used to

• Reduce the error

      by generating a

      correction signal to

      the final control

      element

• Eliminate the disturbance by generating a correction signal to the final control element

• Both (a) and (b)

• Increase the error

      by generating a

      correction signal

      to the final

      control element

A proportional (P) controller

• Continuously adjusts the manipulated variable so that the input to the process is approximately balanced with the process demand

• continuously adjust the controlled variable so that the input to the process is approximately balanced with the process demand

• Both (a) and (b)

• continuously

       adjust the

       controlled

       variable so that

       the input to the

       process is

       approximately

       balanced with

       the process

       demand

In proportional control

• The output of controller is directly proportional to the error

• The output of controller is inversely proportional to the error

• Both (a) and (b)

• The output of controller is inversely proportional to the set-point

A condition where integral control drives the output of a controller into saturation is called _________

• Wind up

• Noise

• Repeat

• offset

With a proportional-only controller, if measurement rules set point, the output will be

• 0

• 100 percent

• 50 percent

• impossible to

      define

All control systems that fit into the usual pattern are__________

• Open-Loop

• Nonself-

      regulating

• Closed-loop

• On/off

Positioning controllers are used for

• Low loads

• Temperature

     changes

• High loads

• High loads

Which phenomenon occurs due to coincidence of two output signals generated manually as well as by control algorithm at the time of switching in manual mode?

• Bumped Data Transfer

• Bumpless Transfer    

• Coincidence Data Transfer 

• Coincidence Data Transfer 

Reset control action is often expressed in units of

• Percent

• Seconds per rate

• Minutes

• Repeats per minute

In propositional-plus-integral (PI) control, the output is propositional to a linear, combination of the ________ error and ______ of the input error.

• input, time interval

• output, time

      interval

• set-point, time

      interval

• manipulated, time interval