An alternating voltage given as, V=100√2 sin100t V is applied to a capacitor of 1 μF. The current reading of the ammeter will be equal to …….. mA
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(a) 20 (b) 10 (c) […]
An inductor 20 mH, a capacitor 50 μF and a resistor 40Ω are connected in series across a source of emf V=10 sin340t. The power loss in AC circuit is
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(a) 0.67 […]
A small signal voltage V(t)=V₀ sin ωt is applied across an ideal capacitor C
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(a) over a full cycle the capacitor C does not consume any energy from the voltage source (b) […]
A 100Ω resistance and a capacitor of 100Ω reactance are connected in series across a 220V source. When the capacitor is 50% charged, the peak value of the displacement current is
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(a) […]
The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100V respectively in an L-C-R circuit. The power factor of this circuit is
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(a) 0.4 (b) 0.5 […]
Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication?
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(a) R=20 Ω, L=1.5 H, C=35 μF (b) R=25 Ω, L=2.5 H, C=45 μF […]
A filament bulb (500W,100V) is to be used in a 230V main supply. When a resistance R is connected in series, it works perfectly and the bulb consumes 500w. The value of R is
The frequency of an alternating voltage is 50 cycles per second and its amplitude is 120 V. Then the r.m.s. value of voltage is
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(a) 84.8 V (b) 101.3 V (c) 70.7 […]
An a.c. supply gives 30 volt r.m.s which passes through a 10Ω resistance. The power dissipated in it is
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(a) 90 W (b) 90√2 W (c) 45 W (d) 45√2 W
Correct […]
A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when
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(a) number of turns in the coil is reduced […]
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