Question

2. Given push buttons (A and B), coil relays (CR1 and CR2) and LED Light indicator, a) complete the truth table for the following relay logic circuit, and then b) complete a truth table for the same circuit, but when relay coil 2 failed open: (10pts) し2 CR1 CR2 CR1 CR2 Indicator True Table (Good Circuit) Output True Table (With Fault) B Output 0 0 0 0 1 0 0

Answer 1

Solution:

(2)

The LED indicator lit up if both the push button are closed.

Truth table(good circuit)

A	B	output
0	0	0
0	1	0
1	0	0
1	1	1

Truth table(fault circuit,open)

A	B	output
0	0	0
0	1	0
1	0	1
1	1	1