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Calculate the instantaneous voltage for AC supply of 220 V and 50 Hz.

Text Solution

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Given rms value of voltage `epsilon_("rms") = 220 V`
Frequency f = 50 Hz
Instantaneous voltage is given by
`epsilon= epsilon_(0) sin omega t = sqrt(2)epsilon_("rms") sin2 pift `
Here `epsilon_(0)=` Peak value of current = `sqrt(2) epsilon_(rms)`
`omega` = angular frequency = `2pif`
`implies " " epsilon = sqrt(2) xx220 xxsin ( 2xx3.14 xx50 t ) `
=311 sin 314 tV
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MODERN PUBLICATION-ALTERNATING CURRENT -CHAPTER PRACTICE TEST
  1. Calculate the instantaneous voltage for AC supply of 220 V and 50 Hz.

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  2. Write the relation between the rms value and peak value of AC.

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  3. Discuss the phase relationship between current and emf in an circuit c...

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  4. In a series LCR circuit, V(L) = V(C ) != V(R ). What is the value of p...

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  5. Why cannot a transformer be used to step up d.c. voltage ?

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  6. Why do we prefer a choke coil to a rhestat in controlling a.c.?

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  7. Why is electrical energy transmitted at high voltage from a distant po...

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  8. A step down transformer converts transmission line voltage from 2200 V...

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  9. The rms value of current in a 50 Hz AC source is 4 A. What will be the...

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  10. An electric heater is connected to DC and AC sources of equal voltage ...

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  11. Under which condition the current will lag behind the voltage? Explain...

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  12. When an ac source is connected to an ideal capacitor, show that the av...

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  13. Show that in the free oscillations of an LC circuit, the sum of energi...

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  14. Can the voltage drop across the inductor or capacitro in a series LCR ...

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  15. An alternating voltage given by V = 240 sin 314 t is connected across ...

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  16. What is power factor of an LCR circuit ? Explain on the basis of power...

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  17. (a) In a series LCR circuit connected across an AC source of varible f...

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