A L-C-R circuit with L=1.00 mH, C=10μF and R=50Ω, is driven with 5 V AC voltage. At resonance, the current through the circuit is
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(a) 0.2 A (b) 0.25 A (c) 0.15 […]
A choke is preferred to a resistance for limiting current in AC circuit because
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(a) Choke is cheap (b) There is no wastage of power (c) Choke is compact in size (d) […]
A generator at a utility company produces 100 A of current at 4000 V. The voltage is stepped up to 240000 V by a transformer before it is sent on a high voltage transmission line. […]
A galvanometer of resistance 50Ω is connected to a battery of 3 V along with a resistance of 2950 Ω in series. A full scale deflection of 30 divisions is obtained in the galvanometer. In […]
A capacitor of 2.5 μF is charged through a resistor of 4 MΩ. In how much time will potential drop across capacitor will become 3 times that of resistor (ln2=0.693)
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(a) 13.86 […]
A galvanometer has a resistance 50Ω. A resistance of 5Ω is connected parallel to it. Fraction of the total current flowing through galvanometer is
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(a) (1/10) (b) (1/11) (c) (1/50) (d) (2/15)
A 50Hz AC signal is applied in a circuit of inductance of (1/π)H and resistance 2100Ω. The impedance offered by the circuit is
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(a) 1500Ω (b) 1700Ω (c) 2102Ω (d) 2500Ω
Correct […]
A galvanometer coil has a resistance of 15 ohm and gives full scale deflection for a current of 4 mA. To convert it to an ammeter of range 0 to 6 A,
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A step down transformer is used on a 1000 V line to deliver 20 A at 120 V at the secondary coil. If the efficiency of the transformer is 80%, the current drawn from the […]
A 0.01 H inductor and √3 πΩ resistance are connected in series with a 220 V, 50 Hz Ac source. The phase difference between the current and emf is
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(a) π ∕ […]
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