ELECTRIC CIRCUITS QUIZ

A star connected load has three equal impedance each of (40 + j30) Ω If the line current is 5 A then value of line voltage is

250 V.

200 V.

250 √3 V.

250 / √3 V.

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In series RLC circuit what is the power factor just above the resonance frequency?

Leading

Lagging

Unity

Zero

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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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Condition for a balanced 3 - phase load is that, each phase has the same value of __________________.

impedance.

power factor.

resistance.

all of these.

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The power dissipated in a pure capacitor is

both (B) and (C) above.

proportional to the value of capacitance.

proportional to applied voltage.

zero.

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For closer tolerance which of the following capacitors is usually preferred?

Ceramic disc capacitor.

Mica capacitor.

None of them.

Paper capacitor.

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A conductor of length l meters moves at right angles to a uniform magnetic field of flux density B = 1.5 T. if the velocity of revolution of the conductor is 50 ms-1 then induced e.m.f. in the conductor is

125 V.

100 V.

75 V.

0 V.

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What is Va in the below circuit?

(6R + 10) / 3.

(3R + 10) / 3.

(6R - 10) / 3.

(4R + 10) / 3.

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While comparing magnetic field and electric circuits, the point of dissimilarity exists while considering

flux and current flow.

mmf and emf.

permeance and conductance.

reluctance and resistance.

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A 100 μF capacitor supplied from 3 V source with a frequency of 50 Hz. The capacitive reactance is

7.96 Ω.

63.68 Ω.

15.92 Ω.

31.84 Ω.

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