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Electric Circuits

Electric Circuits
Poorest conductor of electricity is

  Aluminium.
  Carbon.
  Silver.
  Steel.

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Electric Circuits
Five capacitors each of 5 µF are connected in series, the equivalent capacitance of the system will be

 5 µF
 25 µF
 10 µF
 1 µF

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Electric Circuits
The greater the internal resistance of a cell

 the lesser the emf.
 the greater the terminal voltage.
 the greater the emf.
 the lesser the terminal voltage.

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Electric Circuits
A parallel plate capacitor contain there dielectric layers of 1, 2 and 3 respectively and thickness of dielectric layers are 0.2 mm, 0.3 mm and 0.4 mm respectively. If area of plate is 20 cm2. What is the value of capacitance?

 36.6 pF.
 30 pF.
 32 pF.
 None of them.

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Electric Circuits
Capacitors for P.f correction are rated in

 KVA.
 KVAR.
 KV.
 KW.

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

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