Refer to the drawing of a valve motor control circuit (see figure below).
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.
Pushbutton PB2 has been momentarily depressed and then released, and the valve is currently at mid-stroke and moving to the open position.
Under these conditions, which one of the following describes the position of contacts #1, #2, and #3?
A. #1 closed; #2 open; #3 open
B. #1 open; #2 closed; #3 closed
C. #1 open; #2 closed; #3 open
D. #1 closed; #2 open; #3 closed
Show Answer
Answer: A
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