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Electric Circuits

Electric Circuits
Which of following is the unit of magnetic flux density?

 Weber.
 Daraf.
 Tesla.
 Lumens.

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Electric Circuits
If emf in a given circuit is given by e = 100 sinω0t, then maximum value of voltage and frequency will be

 100 V, 50 Hz.
 100√2 V, 100 Hz.
 50√2 V, 100 Hz.
 100 V, 100 Hz.

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Electric Circuits
Electrics supply for electroplating should be

 low frequency ac voltage.
 any of above.
 DC voltage.
 low AC voltage.

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Electric Circuits
A balanced three Phase Y-connected load has one phase voltage VB = 277∠45o V. The phase sequence is RYB. The line to line voltage VRY is

 480∠ - 45o V.
 480∠45o V.
 339∠45o V.
 339∠- 45o V.

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Electric Circuits
A balanced star connected load with impedance of 30j - 300 Ω is supplied from a 3 - phase, 4-wire, 173 V system, the voltages to neutral being 100j -900, 100j - 300 and 100j -1500 V. The current in neutral wire is

  50 A.
  8.85 A.
  5 A.
  zero.

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Electric Circuits
If Vout = 1 V for 1 kHz input then what would be Vout for 10 kHz for same input ?

 0.1 V .
  1 V.
 None of these.
 0.01 V.

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