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Electric Circuits

Electric Circuits
If the peak value of a sine wave is 100 V, then its RMS value will be

 70.7 V.
 88 V.
 100 V.
 63.6 V.

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Electric Circuits
The frequency of EMF generated by a generator depends upon its

 number of poles.
 speed.
 both speed and number of poles.
 nature of supply.

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

  Steel.
  Silver.
  Copper.
  Aluminium.

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Electric Circuits
In 2 port network Z12 = Z21 indicates which property

 bilateral.
 non linear.
 linear.
 unilateral.

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Electric Circuits
Which cell has the reversible chemical reaction?

 Carbon Zinc.
 Lead acid.
 Mercury oxide.
 Silver oxide.

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Electric Circuits
Two resistors R1 and R2 give combined resistance of 4.5 Ohm when connected in series and 1 Ohm when in parallel, the resistances are

 2.2 Ohm and 2.3 Ohm.
 2 Ohm and 2.5 Ohm.
 1.5 Ohm and 3 Ohm.
 1.25 Ohm and 3.25 Ohm.

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