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An AC source is 120 V-60 Hz. The value...

An AC source is 120 V-60 Hz. The value of voltage after 1/720 s from start will be

A

20.2 V

B

42.4 V

C

84.8 V

D

106.8 V

Text Solution

Verified by Experts

The correct Answer is:
C
`V=V_(0)sin omegat=V_(rms)sqrt(2)sinomegat`
after `t=(1)/(720)s`
`V=120sqrt(2) sin 2pivt=120sqrt(2)sin 2pixx60xx(1)/(720)`
`=120sqrt(2)"sin"(pi)/(6)=120sqrt(2)xx(1)/(2)=60sqrt(2)=84.8 V`
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-ELECTROMAGNETIC INDUCTION-Example 1
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  2. Alternating current can not be measured by D.C. Ammeter because

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  3. An AC source is 120 V-60 Hz. The value of voltage after 1/720 s from...

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  4. The instantaneous voltage through a device of impendance 20 Omega is V...

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  6. If the frequency is doubled, what happens to the capacitive reactance ...

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  8. To express AC power in the same from as DC power, a special value of c...

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  9. A light bulb is rated at 100 W for a 220 V ac supply . The resistance ...

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  10. The peak vlaue of alternating current is 5sqrt(2). The mean square val...

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  11. If reading of an ammeter is 10 A, the peak value of current is

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  12. For high frequency, a capacitor offers

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  13. Alternating current is transmitted to distant places at

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  14. In an a.c. Circuit the voltage applied is E=E(0) sin (omega)t. The res...

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  15. RMS value of AC current is . . . . A . . . . Times its peak value. He...

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  17. The average power dissipated in AC circuit is 2W. If a current flowing...

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