Refer to the drawing of a valve motor control circuit (see figure below) for a valve that is currently fully open and has an 8-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.
All contacts are functional, except for contact K2-2 which has failed open.
An operator takes the control switch to CLOSE. Four seconds later, the operator releases the control switch.
When the valve stops moving, what will be the status of the alarm and the red (R) and green (G) indicating lights?
Show Answer
Answer: A
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