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Electric Circuits

Electric Circuits
The capacitive reactance of a capacitor of (1 / 2μF) F at 103 Hz is

 10 6 μF.
 10- 3 μF.
 10- 6 μF.
 10 3 μF.

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Electric Circuits
Disadvantages of constant k type filter

  both A and B.
  attenuation does not increase rapidly beyond cut off frequency.
  none of these.
  characteristic impedance unchanged in pass band.

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Electric Circuits
Two wires of A and B of the same material and length ‘l’ and ‘2l’ have radius ‘r’ and ‘2r’ respectively. The ratio of their specific resistance will be

 1:2.
 1:1.
 4:1.
 1:8.

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Electric Circuits
A balanced 3 - φ star connected load is fed from a 208 V, 3 - φ supply. Each load has resistance of 35 Ω. The total power is

 none of these.
 1236 W.
 411.3 W.
 618 W.

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Electric Circuits
The Norton equivalent of a network is given as IN = 4A and RN = 2 Ohm. When this circuit is connected across a 2 Ohm load, the current through the load is

 2 A.
 1 A.
 0 A.
 4 A.

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Electric Circuits
Emf induced in a coil rotating in a uniform magnetic field will be maximum when the

 rate of change of flux linkage is minimum.
 rate of cutting flux by coil sides is minimum.
 flux linking with the coil is maximum.
 rate of change of flux linkage is maximum.

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