1. What is the most effective method to control sensitive parameters such as drum level and boiler draft? Mark for Review

(1) Points

Feedforward control

Feedback control

PID control

Proportional control

2. Which term is used to describe the effect of a well-tuned control circuit when each response wave is no larger than 1/4 the size of the previous wave? Mark for Review

(1) Points

Quarter wave dampening

Four wave dampening

Minimum offset

Minimum overshoot

3. Most fail-________ valves use air on the bottom of the actuator to force the valve open. Mark for Review

(1) Points

Closed

As is

Open

Midrange

4. Which is a good example of a feedforward controls arrangement? Mark for Review

(1) Points

PID control loop

Proportional only control

Single element drum level control

Three element drum level control

5. What is the function of RESET in a PID loop? Mark for Review

(1) Points

Resets the controller when a trip occurs

Warns the operator of a trip situation

Automatically places a controller in AUTO

Walks a controller back to its original setpoint

6. Which function is used to anticipate and begin early correction of a process variable change? Mark for Review

(1) Points

Derivative (rate)

Feedforward control

Proportional control

Integral (reset)

7. What is the difference (or offset) between the setpoint and the process variable? Mark for Review

(1) Points

Lag

Proportional control

Error

Feedback

8. In a three-element drum level control loop, what becomes a "trim" or method of fine tuning the process? Mark for Review

(1) Points

Steam temperature

Feed flow

Steam flow

Drum level