Question

What type of register would have a complete binary number shifted in one bit at a time and have all the stored bits shifted out one at a time?

(a) Parallel-in Parallel-out

(b) Parallel-in Serial-out

(c) Serial-in Serial-out

(d) Serial-in Parallel-out

I have been asked this question in an online quiz.

Question is taken from Shift Register Counters in portion Registers of Digital Circuits

Answer 1

Correct choice is (c) Serial-in Serial-out

The explanation: Serial-in Serial-out register would have a complete binary number shifted in one bit at a time and have all the stored bits shifted out one at a time. Since in serial transmission, bits are transmitted or received one at a time and not simultaneously.