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Electric Circuits

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

 Power factor.
 Voltage.
 Current.
 All of above.

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Electric Circuits
What will be the capacitance when distance between the 2 plates of a condenser of capacitance 8 micro farad is reduced from 10 mm to 4 mm?

 1 microfarad.
 20 microfarad.
 3.2 microfarad.
 8 microfarad.

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Electric Circuits
Three identical inductors are connected in delta with a 220 V, 50 Hz, 3 - φ, supply. If the phase current is 24 A, then what is the value of each of the inductance?

 0.029.
 0.058 H.
 None of these.
 0.049 H.

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Electric Circuits
Current source has internal impedance connected in parallel with it whereas voltage source has internal impedance connected in __________________ with it.

 parallel
  none of them
  both of above
 series

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Electric Circuits
In which of the following oscillations are not present?

 Over damping
 Critical damping
 Both 2 and 3
 Under damping

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Electric Circuits
Mica capacitor are characterised by all of following except

 low losses.
 low leakage reactance.
 stable operation.
 accurate value.

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