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A generator produces a voltage that is given by $V = 240 \sin 120 t$ , where t is in seconds. The frequency and r.m.s. voltage are

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60 Hz and 240 V

19 Hz and 120 V

19 Hz and 170 V

754 Hz and 70 V

answer is C.

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Detailed Solution

$ν = \frac{ω}{2 π} = \frac{120 \times 7}{2 \times 22} = 19 Hz$

$V_{r m s} = \frac{240}{\sqrt{2}} = 170 V$

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