The output of an exclusive-NOR gate is 1. Which input combination is correct? A

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Question
The output of an exclusive-NOR gate is 1. Which input combination is correct?
Options
A. A = 1, B = 0
B. A = 0, B = 1
C. A = 0, B = 0
D. none of the above

Correct Answer

A = 0, B = 0

Combinational Logic Analysis problems

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1. A 4-variable AND-OR circuit produces a 1 at its Y output. Which combination of inputs is correct?
Options
A. A = 0, B = 0, C = 0, D = 0
B. A = 0, B = 1, C = 1, D = 0
C. A = 1, B = 1, C = 0, D = 0
D. A = 1, B = 0, C = 0, D = 0

4. A logic circuit with an output consists of ________.
Options
A. two AND gates, two OR gates, two inverters
B. three AND gates, two OR gates, one inverter
C. two AND gates, one OR gate, two inverters
D. two AND gates, one OR gate

9. One positive pulse with t_w = 75 �s is applied to one of the inputs of an exclusive-OR circuit. A second positive pulse with t_w = 15 �s is applied to the other input beginning 20 �s after the leading edge of the first pulse. Which statement describes the output in relation to the inputs?
Options
A. The exclusive-OR output is a 20 µs pulse followed by a 40 µs pulse, with a separation of 15 µs between the pulses.
B. The exclusive-OR output is a 20 µs pulse followed by a 15 µs pulse, with a separation of 40 µs between the pulses.
C. The exclusive-OR output is a 15 µs pulse followed by a 40 µs pulse.
D. *The exclusive-OR output is a 20 µs pulse followed by a 15 µs pulse, followed by a 40 µs pulse.

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