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Electric Circuits

Electric Circuits
Current efficiency in electroplating is usually

  99 %.
  70 to 80 %.
  50 to 60 %.
  90 to 98 %.

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Electric Circuits
A series circuit consists of R = 20 Ω, L = 20 mH, and AC supply 60 V with f = 100 Hz. The voltage drop across R is

 40.8 V.
 24.4 V .
  30.6 V.
  50.8 V.

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Electric Circuits
Which of the following are typical resistance and power-dissipation values for a carbon-composition resistor?

 5000 ohms, 100W.
 10000 ohms, 10 W.
 10 ohm, 50 W.
 1000000 ohms, 1 W.

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Electric Circuits
Capacitor does not allow the sudden change of

None of these
 power
 voltage
 current

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Electric Circuits
Internal resistance of ideal current source is

 100 ohms
 infinite
 zero
 finite

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

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