Question

An ac generator produced an output voltage E = 170 sin 377 t volts , where t is in seconds. The frequency of ac voltage is
(a) 50 Hz
(b) 110 Hz(c) 60 Hz(d) 230 Hz

Answer 1

answer : option (c) 60Hz

explanation : An ac generator produced an output voltage , $E=170sin377t$ volts , where t is in seconds.

compare this with standard equation of voltage ,$E=E_0sin\omega t$

so, $E_0$ = 170 and $\omega$ = 377

we know, frequency = angular frequency/2π

e.g., $\textbf{frequency}=\frac{\omega}{2\pi}$

= 377/(2 × 3.14)

= 377/6.28

= 60.0318Hz ≈ 60Hz

hence, the frequency of ac voltage is 60Hz

Answer 2

Explanation:

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