Alternating Current Mock Tests

In an LCR series circuit, L = 10 mH, C = 1 μF, and R = 10 Ω. The resonant frequency of the circuit is:

A transformer steps up the voltage by a factor of 100. If the primary current is 5 A and the transformer is 90% efficient, the secondary current is approximately:

In a series LCR circuit, resonance occurs when:

AC emf E = E₀ sin(100t) on pure inductor L. Angular frequency and reactance:

In an LCR series circuit, L = 0.5 H, C = 80 μF, and R = 100 Ω. The resonant frequency of the circuit is approximately:

In an AC circuit, the power factor is unity when:

An alternating emf E = E₀ sin(100t) is applied to a pure inductor. Angular frequency and inductive reactance are:

An AC source of voltage V = V₀ sin(100t) is connected across a pure capacitor of capacitance C = 10 μF. The current in the circuit: