AC Circuits Quiz 1

The motor of an electric fan has a self inductance of 10 H, and is connected to a 50-Hz ac supply in series with a capacitor. If maximum power transfer occurs when $X_L = X_C$ , the capacitance of the capacitor is

The reactance of a coil is 157 $\Omega$. On connecting the coil across a source of frequency 100 Hz, the current lags behind the emf by 45°. The inductance of the coil is

In a series LCR circuit, the power factor at resonance is

The current in an LC circuit at resonance is called

In a series LCR circuit at resonance, the applied emf and current are

In a series LCR circuit, $R = 3 \Omega, X_L = 8 \Omega \ and \ X_C = 4 \Omega$. The impedance of the circuit is

A sinusoidal emf of peak value $150 \sqrt 2 \ V$ is applied to a series LCR circuit in which R = 3 $\Omega$ and Z = 5 $\Omega$. The rms current in the circuit is

In a series LCR circuit, $R = 3 \Omega, Z = 5 \Omega, i_{rms} = 40 A$ and power factor = 0.6. The average power dissipated in the circuit is

A parallel LC resonant circuit is used as

A senes LCR resonant circuit is used as