Alternating Current questions
577 published questions with worked solutions.
- Same current is flowing in two alternating circuits. The first circuit contains only inductor and the order contains only a...
- When an inductor 'L' and a resistor 'R' in series are connected across a 15 V, 50 Hz a.c. supply, a current of 0.3 A flows in the...
- An a.c. source of 15 V, 50 Hz is connected across an inductor (L) and resistance (R) in series. R.M.S. current of 0.5 A flows in...
- A resistor of 100 , inductor of self inductance ( 4 ^2 )H and a capacitor of unknown capacity are connected in series to an a.c....
- In series LCR resonant circuit, R=800 , C = 2 F and voltage across resistance is 200V. The angular frequency is 250 rad/s. At...
- The number of turns in the primary and the secondary of a transformer are 1000 and 3000 respectively. If 80 V a.c. is applied to...
- At a particular angular frequency, the reactance of capacitor and that of inductor is same. If the angular frequency is doubled,...
- A group of lamps having total power rating 1000 W is supplied by an AC voltage of E = 200 sin (310t + 60°), the r.m.s. value of...
- A transformer has 20 turns in the primary and 100 turns in the secondary coil. An ac voltage of V_ in = 600 314 ,t is applied to...
- With increase in frequency of a.c. supply, the impedance of an L-C-R series circuit
- What will be the phase difference between virtual voltage & virtual current when current in the circuit is wattles?
- The power factor of an R-L circuit 1 2 , If the frequency of AC is doubled the power factor will now be
- An alternating voltage is applied to a series LCR circuit. If the current leads the voltage by 45°, then ( 45° = 1)
- For a purely inductive or a purely capacitive circuit, the power factor is
- The reciprocal of the total effective resistance of LCR a.c. circuit is called
- The alternating e.m.f. included in the secondary coil of a transformer is mainly due to
- In an LCR series circuit, at resonance,
- A series resonant circuit consists of an inductor 'L' and capacitor 'C' which produces resonant frequency 'f' If 'L' is increased...
- An electric lamp connected in series with a capacitor and an a.c source is glowing with certain brightness. On reducing the...
- A coil has inductive reactance 3 H. The ratio of its reactance when it is first connected to an a.c. source and then to...
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