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Electric Circuits

Electric Circuits
In which braking back emf exceeds supply voltage?

  Regenerative.
  Dynamic.
  Plugging.
  None of these.

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Electric Circuits
Internal resistance of ideal voltage source is

 finite
 100 ohms
 infinite
 zero

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Electric Circuits
Which resistor will be physically larger in size?

 100 Ω, 10 W.
 1 M Ω, 1/2 W.
 1 k Ω, 1 W.
 10 Ω, 50 W.

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Electric Circuits
Two resistances R1 and R2 give combined resistances 4.5 Ω and 1 Ω when they are connected in series and parallel respectively. What would be the values of these resistances?

 3 Ω and 9 Ω.
 6 Ω and 9 Ω.
  3 Ω and 6 Ω.
  1.5 Ω and 3 Ω.

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Electric Circuits
A branch of a network is said to be passive when it contains

 voltmeter.
 battery.
 voltage source.
 current source.

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Electric Circuits
A constant current source supplies a electric current of 300 mA to a load of 1 KΩ. When the load changed to 100 Ω, the load current will be

 30 mA.
 100 mA.
 300 mA.
 3 A.

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