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The voltage of an ac supply varies with time(t) as V=120sin100πtcos100πt.  The maximum voltage and frequency respectively are 

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120 volts, 100 Hz
1202volts, 100 Hz
60 volts, 200 Hz
60 volts, 100 Hz

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detailed solution

Correct option is D

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

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The voltage of an ac source varies with time according to the equation V=100sin100πcos100πt  where t is in seconds and V is in volts. Then  

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