Question

A shaft encoder attached to a DC motor has a sensitivity of 500 pulses per revolution. A frequency meter connected to the encoder output indicates 5500 Hz. The speed of the motor in rpm is:

• A. 110
• B. 220
• C. 550
• D. 660

Hint:

Motor rpm = \( \dfrac{\text{frequency}}{\text{pulses/rev}} \times 60 \)

Answer 1

The Correct Option is D

Given: \[ \text{Frequency} = 5500\ \text{Hz},\quad \text{Pulses/rev} = 500 \] Then: \[ \text{Revolutions/sec} = \dfrac{5500}{500} = 11 \Rightarrow \text{rpm} = 11 \times 60 = 660 \]