Alternating Current questions
577 published questions with worked solutions.
- The rms value of conduction current in a parallel plate capacitor is 6.9 A. The capacity of this capacitor, if it is connected to...
- A sinusoidal voltage V(t) = 210 sin 3000t volt is applied to a series LCR circuit in which L = 10 mH, C = 25 F and R = 100 . The...
- If wattless current flows in the AC circuit, then the circuit is :
- At very high frequencies, the effective impendance of the given circuit will be____ .
- Match List I with List II List-I: (A) AC generator (B) Transformer (C) Resonance phenomenon to occur (D) Sharpness of resonance...
- A series LCR circuit is connected to an ac source of 220 V, 50 Hz. The circuit contain a resistance R = 100 and an inductor of...
- An AC voltage source of variable angular frequency and fixed amplitude V_0 is connected in series with a capacitance C and an...
- A series R-C circuit is connected to AC voltage source. Consider two cases; (A) when C is without a dielectric medium and (B)...
- The instantaneous voltages at three terminals marked X, Y and Z are given by V_X=V_0 t, V_Y=V_0 ( t+ 2 3 ) and V_Z=V_0 ( t+ 4 3...
- Which one of the following devices changes low voltage alternating current to high voltage alternating current and vice versa ?
- Step-up transformers are used for
- Ms. Rani decides to convert her AC generator into a DC generator. Which one of the following she would need to use ?
- A series LCR circuit is connected to a 45 ( t) Volt source. The resonant angular frequency of the circuit is 10^5 rad s^ -1 and...
- A series LCR circuit has L = 0.01 H, R = 10 and C = 1 F and it is connected to ac voltage of amplitude (V_m) 50 V. At frequency...
- To light, a W, 100 V lamp is connected, in series with a capacitor of capacitance (50/( x )) F, with 200 V, 50 Hz AC source. The...
- A transformer operating at primary voltage 8 kV and secondary voltage 160 V serves a load of 80 kW. Assuming the transformer to...
- The frequencies at which the current amplitude in an LCR series circuit becomes 1/ 2 times its maximum value, are 212 rad s^ -1...
- A telegraph line of length 100 km has a capacity of 0.01 F/km and it carries an alternating current at 0.5 kilo cycle per second....
- 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...
- An alternating emf E = 440 sin 100 t is applied to a circuit containing an inductance of ( 2 / ) H. If an a.c. ammeter is...
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