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Electric Circuits

Electric Circuits
What is the SI unit of electric current ?

 Ampere.
 Ohm.
None of these
 Faraday.

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Electric Circuits
Two resistor are said to be connected in parallel when

 both have the same potential difference.
 total current equals the sum of branch currents.
 both ‘b’ and ‘c’
 both carry the same value of current.

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Electric Circuits
The equation for 25 cycles current sine wave having rms value of 30 amps, will be

 30sin50πt.
 42.4sin50πt.
 42.4sin25πt.
 30sin25πt.

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Electric Circuits
A positive and a negative charged conductor are initially 50 mm apart. When they are moved close together so that they are now only 10 mm apart, the force between them will be

 25 times larger than before.
 10 times greater than before.
 5 times smaller than before.
 5 times greater than before.

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Electric Circuits
A capacitor carries a charge of 0.1 C at 5 V. Its capacitance is

 0.02 F
 0.2 F
 0.05 F
 0.5 F

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Electric Circuits
An electrical motor has rating of 10 MVA at 0.8 lag, represented as series RL circuit at a 50 MVA base. Find the impedance value?

 (2 + j4) pu
 (3 + j4) pu
 (4 + j2 ) pu
 (4 + j3) pu

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