In the series resonance the value of impedence is 3 Ω and the resistance is 4Ω,
In the series resonance the value of impedence is 3 Ω and the resistance is 4Ω, then the value of power factor of the circuit is
Options
(a) (4/3) (b) (3/4) (c) zero […]
Questions
An electric bulb has a rated power of 50W at 100 V. if it used on an a.c. source
An electric bulb has a rated power of 50W at 100 V. if it used on an a.c. source 200V, 50 Hz, a choke has to be used in series with it. This choke should […]
Two tangent galvanometers A and B have coils of radii 8 cm and 16 cm respectively
Two tangent galvanometers A and B have coils of radii 8 cm and 16 cm respectively and resistance 8 Ω each.They are connected in parallel with a cell of emf 4 V and negligible internal […]
In an AC generator, a coil with N turns, all of the same area A and total resistance R,
In an AC generator, a coil with N turns, all of the same area A and total resistance R, rotates with frequency ω in a magnetic field B. The maximum value of emf generated in […]
In a series resonant LCR circuit, the voltage across R is 100 volts and R =1kΩ
In a series resonant LCR circuit, the voltage across R is 100 volts and R =1kΩ with C= 2 μF. The resonant frequency ω is 200 rad/s. At resonance the voltage across L is
An LCR circuit contains resistance of 100 ohm and a supply of 200 volt at 300 radian
An LCR circuit contains resistance of 100 ohm and a supply of 200 volt at 300 radian angular frequency. If only capacitance is taken out from the circuit and the rest of the circuit is […]
An alternating voltage of 220 V, 50 Hz frequency is applied across a capacitor
An alternating voltage of 220 V, 50 Hz frequency is applied across a capacitor of capacitance 2 μF. The impedence of the circuit is
Options
(a) π/5000 (b) 1000/π (c) 500π (d) 5000/π
Correct […]
An inductor is connected to an a.c. source when compared to voltage,
An inductor is connected to an a.c. source when compared to voltage, the current in the lead wires
Options
(a) is ahead in phase by π (b) lags in phase by π (c) […]
In a LCR series circuit, the potential difference between the terminals of the inductor
In a LCR series circuit, the potential difference between the terminals of the inductor is 60 V, between the terminals of the capacitor is 30 V and that across the resistance is 40 V. Then, […]
The rms current in an AC circuit is 2 A. If the wattless current be √3 A,
The rms current in an AC circuit is 2 A. If the wattless current be √3 A, what is the power factor of the circuit?
Options
(a) (1/2) (b) (1/3) (c) 1/√3 (d) 1/√2