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A generator produces a voltage that is g...

A generator produces a voltage that is given by V = 240 sin 120t, where t is in second the frequency of voltage is ........ Hz.

A

20

B

180

C

40

D

19

Text Solution

Verified by Experts

The correct Answer is:
D
Compare V=240 sin 120t with `V=V_m sin omegat`
`omega=120`
`therefore f=120/6.28`
`therefore 2pif =120`
`therefore f approx` =19 Hz
`therefore f=120/(2pi)`
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