Refer to the drawing of a valve motor control circuit (see figure below) for a valve that is currently fully closed and has a 10-second stroke time.
Note: Limit switch (LS) contacts are shown open regardless of valve position, but relay contacts are shown open/closed according to the standard convention for control circuit drawings.
The operator takes the control switch to OPEN for 5 seconds and then releases the switch.
After one minute, the operator takes the control switch to CLOSE for 5 seconds and then releases the switch.
Which one of the following describes the valve position immediately after the control switch is released the second time?
A. Approximately fully open.
B. Approximately fully closed.
C. Approximately 50 percent open.
D. Cannot be determined without additional information.
Show Answer
Answer: B
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