Question Library

The voltage across a reactance carrying an a.c. I = 10 sin200πt is given by v = 20 sin (200 \(\pi\)t + \(\frac{\pi}{2}\)), Calculate the frequency.

In an A.C circuit, the instantaneous current is 7A. What is the root mean square(r.m.s) value of the current I\(_{r.m.s}\)

From the above circuit, calculate the impedance ((\(\pi\) = \(\frac{22}{7}\), f = 50Hz)

An alternating voltage with a frequency of 50 Hz has a period of

Calculate the inductance L of the COIL in the circuit shown above

A series R - L - C circuit is shown in the diagram above. Which of the following vector diagrams correctly represents the phase relationship among I, V, V\(_F\), V\(_C\), and V\(_L\), if V\(_C\) is greater than V\(_L\) and the symbols have their usual meaning?

If the current in the resistor R is 0.05 A, calculate the p.d across the inductor.

A capacitor of capacitance 25μF is connected to an a.c power source of frequency \(\frac{200}{π}\) Hz. Calculate the reactance of the capacitor.

An alternating current, having a waveform shown in the diagram above, is represented by the equation X = X\(_o\) sinωt. Which of the following represents X\(_o\)?

Calculate the inductive reactance of the circuit shown above

In a series resonant circuit, the current flowing in the circuit is

What is the inductance reactance of a coil of 7H when connected to a 50Hz a.c circuit?

The unit of impedance is

Using the circuit above, at resonance

A constant voltage source supplies a sinusoidal alternating e.m.f. The voltage marked against the components are their peak values. Determine the peak value of the applied e.m.f