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Electric Circuits

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

 Voltage.
 Power factor.
 Current.
 All of above.

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Electric Circuits
Capacitors for P.f correction are rated in

 KV.
 KW.
 KVA.
 KVAR.

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Electric Circuits
An AC voltage of 200 V at 50 Hz is applied to a coil which draws 5 A and dissipates 1000 W. The resistance and impedance of the coil respectively are

 40 Ω and 200 Ω.
 40 Ω and 40 Ω.
 50 Ω and 200 Ω.
 25 Ω and 5 Ω.

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Electric Circuits
The maximum value of a current wave is 2A. If the form factor of a current wave is 1.5 and the peak factor is 2.7, find the average value in Amperes.

 0.741 A.
 1.57 A.
 1.414 A.
 0.494 A.

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Electric Circuits
Among the options which metal has the highest electrical conductivity?

 Steel.
 Stranded aluminium.
 Copper.
 Aluminium.

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Electric Circuits
Active materials of a lead acid cell are

 lead peroxide.
 all of above.
 dilute H2SO4.
 spongy lead.

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MORE MCQ ON Electric Circuits

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