Question

A silicon semiconductor diode when subjected to ohmmeter testing gives low resistance in both directions. Which of the following is the correct inference to be drawn?

(a) Diode is faulty

(b) Power failure to the Ohmmeter

(c) Diode is short-circuited

(d) Diode is open circuited

The question was posed to me in exam.

I would like to ask this question from Types of Diode and their Testing topic in chapter Diode Circuit of Analog Circuits

Answer 1

Right option is (c) Diode is short-circuited

For explanation I would say: A proper diode gives a low resistance reading along one direction and high resistance reading along the other. Hence, if diode gives low resistance readings in both directions, then the diode must be short-circuited. It’s noteworthy that a faulty diode gives a high resistance reading along both paths.