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Electric Circuits

Electric Circuits
What is the mass number of an element that has 19 protons, 19 electrons, and 20 neutrons?

 19.
 39.
 20.
 38.

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Electric Circuits
Purpose of using capacitor is / are

 to do phase split in AC 1 phase motor.
 effect DC filter in electronic circuit.
 increase p.f of inductive load circuit.
 all of these.

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Electric Circuits
Which part of magnetic path requires largest mmf?

 Air gap.
 Core.
 Coil.
 Inductance.

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Electric Circuits
A capacitor having a capacitance of 40 μF is connected across 250 V DC source. The charging current will be least

 initially.
 when capacitor is almost 25% charged.
 when capacitor is fully charged.
 when capacitor is half charged.

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Electric Circuits
Among the options which metal has the highest electrical conductivity?

 Stranded aluminium.
 Copper.
 Aluminium.
 Steel.

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Electric Circuits
The common voltage across parallel branches with different voltage sources can be determined by the relation V = (V1 / R1 + V2 / R2 + V3 / R3) / (1 / R1 + 1 / R2 +1 / R3 .....) The statement is associated with which theorem?

 Millman’s theorem.
 Thevenin’s theorem.
 Norton’s theorem.
 Superposition theorem.

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