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The frequency of an alternating voltage ...

The frequency of an alternating voltage is 50 cycles/s and its amplitude is 120 V. Then what is the rms value of voltage ?

A

101.3 V

B

84.9 V

C

70.7 V

D

56.5 V

Text Solution

Verified by Experts

The correct Answer is:
B
`V_(rms)=V_m/sqrt2=120/1.414`=84.86
`therefore V_(rms) approx` 84.9 V
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KUMAR PRAKASHAN-ALTERNATING CURRENTS -SECTION-D MCQs (DARPAN BASED ON TEXTBOOK)
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  2. In a circuit, the value of the alternating current is measured by hot ...

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  3. The frequency of an alternating voltage is 50 cycles/s and its amplitu...

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  5. An A.C. circuit consists of an Indicator of inductance 0.5H and a capa...

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  6. The phase difference between the current and voltage of L-C-R circuit ...

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  7. The resonant frequency of a circuit is f. If the capacitance is made 4...

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  8. An L-C-R series circuit with R = 100Omega is connected to a 200 V, 50 ...

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  9. As shown in figure series L-C-R circuit , when driven by an emf source...

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  10. A transistor oscillator using a resonant circuit with an inductor L (o...

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  11. The A.C. voltage and the current in a circuit are given by the followi...

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  12. In the transmission of a.c. power through transmission lines, when the...

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  13. As shown in the figure, series combination of ideal capacitor, pure re...

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  14. Three series A.C. circuits (i) RC (ii) RL and (iii) LC (where values o...

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  15. For one series A.C. circuit, its reactance is equal to its resistance....

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  16. Wattless current is possible in a circuit having ………..

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  17. In a series LCR A.C. circuit, by keeping resistance constant, power fa...

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  18. Ratio of power factor in two A.C. circuits (i) containing only resista...

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  19. Total energy of one LC circuit is xJ. Then at t=0, energy of fully cha...

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  20. A circuit connected with a source of 230 V, draws a current of 2A and ...

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