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Q.

The voltage of an ac supply varies with time(t) as V=120sin100 π tcos100π t.  The maximum voltage and frequency respectively are

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a

120 volts, 100 Hz

b

1202volts, 100 Hz

c

60 volts, 200 Hz

d

60 volts, 100 Hz

answer is D.

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Detailed Solution

V=120  sin100πt  cos 100 πt⇒ V =60 sin 200πt Vmax=60V  andν=100Hz
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