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Alternating Currents
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Alternating Currents
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15 Questions

1. A step-up transformer operates on a 230 V line andsupplies a load of 2 ampereThe ratio of the primary andsecondary windings is 1: 25The current in the primaryis
2. In an experiment - 200 VA.Cis applied at the ends ofan LCR circuitThe circuit consists of an inductivereactance (XL) = 5 Ω - capacitive reactance (XC) = 5 Ω andohmic resistance (R) = 10:The impedance of the circuitis [1996]
3. Energy in a current carrying coil is stored in theform of [1988]
4. In an electrical circuit R - L - C and an a.cvoltagesource are all connected in seriesWhen L is removedfrom the circuit - the phase difference between thevoltage the current in the circuit is π /3If instead - C isremoved from the circuit - the phase difference is again π/3The power factor of the circuit is: [2012]
5. A 220 volts input is supplied to a transformerTheoutput circuit draws a current of 2.0 ampere at 440voltsIf the efficiency of the transformer is 80% - thecurrent drawn by the primary windings of thetransformer is [2010]
6. A coil of self-inductance L is connected in serieswith a bulb Band an AC sourceBrightness of the bulbdecreases when [NEET2013]
7. Eddy currents are produced when [1988]
8. In a region of uniform magnetic induction B= 10 -“2tesla - a circular coil of radius 30 cm and resistance Ï€2ohm is rotated about an axis which is perpendicular tothe direction of B and which forms a diameter of the coil.If the coil rotates at 200 rpm the amplitude of thealternating current induced in the coil is [1988]
9. Energy in a current carrying coil is stored in theform of [1988]
10. A step-up transformer operates on a 230 V line andsupplies a load of 2 ampereThe ratio of the primary andsecondary windings is 1: 25The current in the primaryis
11. In a series resonant circuit - having L - C and R as itselements - the resonant current is iThe power dissipatedin the circuit at resonance is
12. In a region of uniform magnetic induction B= 10 -“2tesla - a circular coil of radius 30 cm and resistance Ï€2ohm is rotated about an axis which is perpendicular tothe direction of B and which forms a diameter of the coil.If the coil rotates at 200 rpm the amplitude of thealternating current induced in the coil is [1988]
13. Eddy currents are produced when [1988]
14. The primary of a transformer when connected to adc battery of 10 volt draws a current of 1 mAThenumber of turns of the primary and secondary windingsare 50 and 100 respectivelyThe voltage in thesecondary and the current drawn by the circuit in thesecondary are respectively [NEETKar2013]
15. A capacitor has capacity C and reactance XIfcapacitance and frequency become double - thenreactance will be [2001]

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