ISRO | ISRO CS 2007 | Question 13

By using an eight bit optical encoder the degree of resolution that can be obtained is (approximately)
(A) 1.8^o
(B) 3.4^o
(C) 2.8^o
(D) 1.4^o

Answer: (D)
Explanation: A digital optical encoder is a device that converts motion into a sequence of digital pulses. It is a pulse generator that provides square-wave signals. The disc has 2 channels divided into “n” equal angular intervals where, n is called resolution or number of counts.
Resolution is defined as the smallest discernible quantity.

Resolution = 360/2ⁿ = 360/2⁸ = 1.4^o

Option (D) is correct.
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