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Earth's Magnetism

The speed of ...

Question

The speed of a gear having 60 teeth is measured using a proximity sensor. The output of the proximity sensor is fed to a counter with a gating time of 1 sec. The counter indicates a value of 120. Find the speed at which the gear is rotating?

A

60 rpm

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B

120 rpm

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C

600 rpm

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D

1200 rpm

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Solution

The correct option is B 120 rpm
$S p e e d = \frac{Pulses recorded per second}{Number of teeths on the rotor} rps$

$= \frac{120}{60} r p s = 2 r p s$

$= 2 \times 60 r p m = 120 r p m$

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