Alternating Current questions
577 published questions with worked solutions.
- A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil is 6 A,...
- A resistance 'R' draws power 'P' when connected to an AC source. If an inductance is now placed in series with the resistance,...
- An inductor 20 mH, a capacitor 50 and a resistor 40 are connected in series across a source of emf V = 10 340t. The power loss in...
- An inductor 20 mH , a capacitor 100 F and a resistor 50 are connected in series across a source of emf, V = 10 314t. The power...
- L = 2H, C = 5 mF and R = 12 are connected in series to an a.c. generator of frequency 50 Hz. then
- The magnetic energy in an inductor changes from maximum value to minimum value 5 ms. When connected to an a.c. source, the...
- The core used in transformer and other electromagnetic devices is laminated to
- When 80 volt d.c. is applied across a solenoid, a current of 0.8 A flows in it. When 80 volt a.c. is applied across the same...
- A transformer is used to set up an alternating e.m.f. of 220 V to 4.4 KV to transmit 6.6 KW of power. The primary coil has 1000...
- A 42 mH inductor is connected to 200 V, 50 Hz a.c. supply. The r.m.s. value of current in the circuit will be nearly [Take = 22 7...
- An inductance coil has a resistance of 80 . When on AC signal of frequency 480 Hz is applied to the coil, the voltage leads the...
- A coil of self inductance L is connected in series with a bulb B and a.c. source. Brightness of the bulb decreases when
- In series LCR resonant circuit, the capacitance is changed from C to 3C. To obtain the same resonant frequency, the inductance...
- In LCR series circuit if the frequency is increased the impedance of the circuit
- An inductor of inductance 2 is connected in series with a resistance a variable capacitor and an a.c. source of frequency 5 KHz....
- An AC voltage source of variable angular frequency ' ' and fixed amplitude V_0 is connected in series with a capacitance C and an...
- A resistor 'R', an inductor 'L' and a capacitor 'C' are connected in series to an oscillator of frequency 'N'. If the resonant...
- In an LCR series circuit, if the angular frequency is gradually increased then match the following columns Column I (A)...
- With an alternating voltage source of frequency 'f', inductor 'L', capacitor 'C' and resistance 'R' are connected in series. The...
- In LCR series resonance circuit, choose the wrong statement
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