Alternating Current questions
577 published questions with worked solutions.
- A circuit of negligible resistance has an inductor of 0.16 H capacitor of 25 connected in series with an alternating voltage...
- A step down transformer has N_s to N_p ratio of 20 : 1. If 8V are developed across 0.4 secondary, the primary current will be
- An inductance coil has a resistance of 100 , . When an a.c. signal of frequency 100 Hz is applied to the coil, the voltage leads...
- In series LCR circuit, the voltage across L, C and R is 50 V, 20 V and 40 V respectively. The a.c. voltage applied across the...
- In an a.c. circuit the instantaneous current and e.m.f. are represented as I = I_0 ( t - 6 ) and E = E_0 ( t + 3 ) respectively....
- The average value of a.c. voltage is given by V = V_msin ( ) over time interval t = 0 to t = is
- An e.m.f. E = 4 cos(1000t) volt is applied to an LR circuit of inductance 3mH and resistance 4 . The maximum current in the...
- A capacitor, an inductor and an electric bulb are connected in series to an a.c. supply of variable frequency. As the frequency...
- An e.m.f. E = E_0 t is applied to circuit containing L and R in series. If X_L = 2R, then the power dissipated in the circuit is
- When a capacitor is connected in series LR circuit, the alternating current flowing in the circuit
- Average power associated with an ideal inductor and ideal capacitor over a complete cycle of a.c. is respectively
- LC series resonant circuit produces resonant frequency 'f'. if 'L' is tripled and 'C' is increased by 3C, the resonant frequency...
- The capacitive reactance of a capacitor 'C' is 'X' . Both, the frequency of a.c. supply and capacitance of the above capacitor...
- The inductive reactance of a coil is 'X<sub>L</sub>'. If the inductance of a coil is tripled and frequency of a.c. supply is...
- The core used in transformers are laminated to
- A coil has inductance H. the ratio of its reactance when it is connected first to an a.c. source and then to d.c. source is
- A resistor of 50 , , inductor of self inductance ( 3 ^ 2 )H and a capacitor of unknown capacity are connected in series to an...
- An e.m.f. E = E_0 wt is applied to the L-R circuit. The inductive reactance is equal to the resistance 'R' of the circuit. The...
- A series resonant circuit consists of inductor 'L' of negligible resistance and a capacitor 'C' which produces resonant frequency...
- The inductive reactance of a coil is 'R' . If inductance of a coil is tripled and frequency of a.c supply is also tripled, then...
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