Refer to the drawing of a lube oil temperature control system (see figure below).
The temperature control system uses a direct-acting transmitter and a direct-acting proportional controller with a 20°F proportional band.
Given:
• The lube oil temperature controller setpoint is 90EF.
• The heat exchanger lube oil outlet temperature is stable at 93EF.
• The temperature control valve is 60 percent open.
If the controller’s proportional band is changed to 30°F, the heat exchanger lube oil outlet temperature will stabilize __________ than 93°F; and the controller output needed to position the temperature control valve to 60 percent open will be __________.
A. lower; the same
B. lower; greater
C. higher; the same
D. higher; greater
Show Answer
Answer: C
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