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Electric Circuits

Electric Circuits
Which of the following materials has highest electrical conductivity ?

  Copper.
  Aluminium.
  Silver.
  Steel.

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Electric Circuits
Three element having conductance G1, G2 and G3 are connected in parallel. Their combined conductance will be

 G1 + G2 + G3.
 (1 / G1 + 1 / G2 + 1 / G3) - 1.
 (G1 + G2 + G3) - 1.
 1 / G1 + 1 / G2 + 1 / G3.

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Electric Circuits
For balanced star load, if unbalanced line current are IR, IY, IB equal to - j10, - j10 and - j20 respectively, the neutral current will be equal to

  (-9.66 + j5) A.
  (8.66 + j5) A.
  (-8.66 - j5) A.
  (8.66 - j5) A.

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Electric Circuits
In the figure, the potential difference between points P and Q is

 - 6 V.
 12 V.
 6 V.
 10 V.

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Electric Circuits
1 F is theoretically equal to

 1 ohm of resistance
 ratio of 1 C to 1 V
 ratio of 1 V to 1 C
 none of these

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Electric Circuits
Active materials of a lead acid cell are

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

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