Question

How many inputs will a decimal-to-BCD encoder have?

(a) 4

(b) 8

(c) 10

(d) 16

I had been asked this question in an online quiz.

This interesting question is from Encoders topic in portion Combinational Circuits of Digital Circuits

Answer 1

The correct answer is (c) 10

For explanation: An encoder is a combinational circuit encoding the information of 2^n input lines to n output lines, thus producing the binary equivalent of the input. Thus, a Decimal-to-bcd converter has decimal values as inputs which range from 0-9. So, a total of 10 inputs are there in a  decimal-to-BCD encoder.