Alternating Current: JEE Main Physics Previous Year Questions

290 previous year questions from Alternating Current. Here are the 25 most important ones; open any question for the correct answer and a full step-by-step solution.

1. $An alternating current is represented by the equation, i = 1002 sin (100 πt) ampere. The RMS value of current and the frequency o\dots$
2. $A series LCR circuit is connected to an ac source of voltage 150 sin (80 πt) volt. If the resistance of the resistor in the circuit is\dots$
3. $An ideal transformer with purely resistive load operates at 12 kV on the primary side. It supplies electrical energy to a number of nearby houses at 120 V. The average ra\dots$
4. $If wattless current flows in the AC circuit, then the circuit is$
5. $The frequency of ac at which 16 μF capacitor and \frac{10}{π ^{2}} mH inductor will have same reactance is$
6. $In an oscillating LC circuit, L = 3.00 mH and C = 2.70 μF . At t = 0, the charge on the capacitor is zero and the current is 2.00 A . The\dots$
7. $A circuit element X when connected to an a.c. supply of peak voltage 100 V gives a peak current of 5 A which is in phase with the voltage. A second element Y when connect\dots$
8. $The power factor of an AC circuit containing peak current 2 A and peak voltage 1 V is 1/2, then the angle between voltage and current is$
9. $When a dc voltage of 100 V is applied to an inductor, a dc current of 5 A flows through it. When an ac voltage of 200 V pea\dots$
10. $For a transformer, the turns ratio is 3 and its efficiency is 0.75 . The current flowing in the primary coil is 2 A and the voltage applied to it is\dots$
11. $A 100 W bulb is connected to an AC source of 220 V, 50 Hz . Then the current flowing through the bulb is$
12. $When you walk through a metal detector carrying a metal object in your pocket, it raises an alarm. This phenomenon works on$
13. $In a series LR circuit with X_{L} = R. power factor is pi. If a capacitor of capacitance C with X_{c} = X_{L} is added to the circuit the power factor becomes\dots$
14. $In LC parallel resonance circuit, choose the wrong statement.$
15. $An alternating emf E = 440 sin100 π t is applited to a circuit containing an inductance of \frac{2}{π} H. If an a.c. ammeter is connected in the circuit,\dots$
16. $In a series LR circuit XL = R and power factor of the circuit is P_{l} . When capacitor with capacitance C such that XL = X_{c} is put in series, the power factor beco\dots$
17. $A series combination of resistor of resistance 100 Ω inductor of inductance 1 H and capacitor of capacitance 6.25 μ F is connected to an ac source. The\dots$
18. $The alternating current is given by i = (42 sin (\frac{2 π}{T} t) + 10) A The r.m.s. value of this current is A.$
19. $In an ac generator, a rectangular coil of 100 turns each having area 14 x 10-2 m^{2} is rotated at 360 rev/min about an axis perpendicular to a uniform magnetic field o\dots$
20. $A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns. The output power is delivered at 230 V by th\dots$
21. $A capacitance of (\frac{10 ^{- 3}}{2 π}) F and an inductance of (\frac{100}{π}) mH and a resistance of 10Ω are connected in\dots$
22. $A capacitor of capacitance 150.0 μ F is connected to an alternating source of emf given by E = 36 sin(120 π) V. The maximum value of current in the circuit is ap\dots$
23. $A 100Ω resistance, a 0.1 μF capacitor and an inductor are connected in series across a 250V supply at variable frequency. Calculate the value of inductan\dots$
24. $In a LCR series circuit, the potential difference between the terminals of the inductance is 60 V, between the terminals of the capacitor is\dots$
25. $In a series LCR circuit, a resistor of 300Ω, a capacitor of 25 nF and an inductor of 100 mH are used. For maximum current in the circuit, the angular frequency o\dots$

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Alternating Current: JEE Main Physics Previous Year Questions

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