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Electric Circuits

Electric Circuits
Which material has extremely large resistance?

 Insulator
 Semiconductor
None of these
 Conductor

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Electric Circuits
Three parallel resistive branches are connected across a DC supply. The ratio of the branch resistances are given as R1:R2:R3 :: 2:4:6. The ratio of the branch currents is

 6:3:2.
 2:4:6.
 2:3:6.
 6:4:2.

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Electric Circuits
A 230V, 50Hz voltage is applied to a coil having L = 5H and R = 2 Ohm in series with capacitance C. When the voltage across the coil is 400V, find the current in the circuit?

 0.4583 A.
 0.1578 A.
 0.1465 A.
 0.2547 A.

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Electric Circuits
Poorest conductor of electricity is

  Steel.
  Silver.
  Aluminium.
  Carbon.

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Electric Circuits
In RLC parallel network R = 2 Ohm, L = 2mH and C = 1μF. Find the value of time constant?

 4 msec
 2 msec
 4 μsec
 2 μsec

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Electric Circuits
The synchronous speed for the seventh space harmonic mmf wave of 8 pole, 50 Hz induction machine will be

 5250 rpm in forward direction.
 107.14 rpm in reverse direction.
 107.14 rpm in forward direction.
 5250 rpm in reverse direction.

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