Ten seconds immediately after switch S1 is closed,rung(s)____ will be true.
A)No.1 only
B)No.1 and No.2
C)No.1 and No.3
D)No.1,No.2,and No.3

Name: Ten seconds immediately after switch S1 is closed,rung(s)____ will be true. A)No.1 only B)No.1 and No.2 C)No.1 and No.3 D)No.1,No.2,and No.3
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Question

Ten seconds immediately after switch S1 is closed,rung(s)____ will be true. 
A)No.1 only 
B)No.1 and No.2 
C)No.1 and No.3 
D)No.1,No.2,and No.3

Quizplus · Accepted Answer

Since switch S1 is closed, input A will become high. This will cause the output of gate 1 to become high and the output of gate 2 and gate 3 to become low. Therefore, only rung No.1 will be true.

Ten Seconds Immediately After Switch S1 Is Closed,rung(s)____ Will Be