Question

In RTL NOR gate, the output is at logic 1 only when all the inputs are at ___________

(a) logic 0

(b) logic 1

(c) +10v

(d) floating

This question was posed to me during an internship interview.

This question is from Compatibility or Interfacing in section Logic Families of Digital Circuits

Answer 1

The correct answer is (a) logic 0

To explain: RTL NOR gate behaves as NOR gate and the output of NOR gate will be 1 only when all the inputs are at logic 0. The output of NOR will be 0 if any of the input is 1.