AC Circuits

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AC Circuits

Test1 Max. Marks = 40

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4 points

(a) 200

(b) 100

(d) 25

Clear selection

2. An ac supply gives 30 V r.m.s. which passes through a 10 Ω resistance. The power dissipated in it is

4 points

(a) 120 W

(b) 90 W

(d) 45 W

Clear selection

3. A 280 ohm electric bulb is connected to 200V electric line. The peak value of current in the bulb will be

4 points

(a) About one ampere

(b) Zero

(d) About four ampere

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4.The maximum value of AC voltage in a circuit is 707V. Its rms value is

4 points

(a) 70.7 V

(b) 100 V

(d) 707 V

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5.Same current is flowing in two alternating circuits. The first circuit contains only inductance and the other contains only a capacitor. If the frequency of the e.m.f. of ac is increased, the effect on the value of the current will be

4 points

(a) Increases in the first circuit and decreases in the other

(b) Increases in both the circuits

(d) Decreases in the first circuit and increases in the other

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6. An inductance of 1 mH a condenser of 10 mF and a resistance of 50 Ω are connected in series. The reactances of inductor and condensers are same. The reactance of either of them will be

4 points

(a) 100 Ω

(b) 30 Ω

(d) 10 Ω

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7. In an ac circuit, a resistance of R ohm is connected in series with an inductance L. If phase angle between voltage and current be 45°, the value of inductive reactance will be

4 points

(a) R/4

(b) R/2

(d) Cannot be found with the given data

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8. In a series resonant circuit, the ac voltage across resistance R, inductance L and capacitance C are 5 V, 10 V and 10 V respectively. The ac voltage applied to the circuit will be

4 points

(a) 20 V

(b) 10 V

(d) 25 V

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9. A coil has L = 0.04 H and R = 12 Ω. When it is connected to 220V, 50Hz supply the current flowing through the coil, in amperes is

4 points

(a) 10.7

(b) 11.7

(d) 12.7

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10. For the series LCR circuit shown in the figure, what is the resonance frequency and the amplitude of the current at the resonating frequency

4 points

(a)

(b)

(c)

(d)

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