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Electric Circuits

Electric Circuits
In direct arc furnace which of following is of high value?

 Current.
 Voltage.
 All of above.
 Power factor.

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Electric Circuits
A 230V, 50Hz voltage is applied to a coil having L = 5H and R = 2 Ohm in series with capacitance C. When the voltage across the coil is 400V, find the value of C?

 4.78 µF.
 8.51 µF.
 10.54 µF.
 1.8 µF.

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Electric Circuits
Power factor can be defined as

 cosine of angle between voltage and current.
 both option B and C.
 sine of voltage and current.
 ratio of resistance versus impedance.

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Electric Circuits
A dependent source can be

 both a voltage or a current source.
 a voltage source.
 neither a voltage nor a current source.
 a current source.

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Electric Circuits
When a lossy capacitor with a dielectric of permittivity ε and conductivity σ operates at a frequency ω the loss tangent for the capacitor is given by

 σ ω ε.
 ω σ/ε.
 ω ε/σ.
  σ/ω ε.

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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 ?

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

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