Q22 of 31 Page 267

Answer the following question:

A capacitor is used in the primary circuit of an induction coil.

This statement is true that A capacitor is used in the primary circuit of an induction coil. This is due to the reason, that when a circuit is broken, capacitor is charged through high induced voltage so as to avoid the sparkling.


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21

Obtain the resonant frequency and Q-factor of a series LCR circuit with L = 3.0 H, C = 27 μF, and R = 7.4Ω. It is desired to improve the sharpness of the resonance of the circuit by reducing its ‘full width at half maximum’ by a factor of 2. Suggest a suitable way.

 22

Answer the following question:

In any A.C. circuit, is the applied instantaneous voltage equal to the algebraic sum of the instantaneous voltages across the series elements of the circuit? Is the same true for rms voltage?

 22

Answer the following question:

An applied voltage signal consists of a superposition of a dc voltage and an A.C. voltage of high frequency. The circuit consists of an inductor and a capacitor in series. Show that the dc signal will appear across C and the A.C. signal across L.

 22

Answer the following question:

A choke coil in series with a lamp is connected to a dc line. The lamp is seen to shine brightly. Insertion of an iron core in the choke causes no change in the lamp’s brightness. Predict the corresponding observations if the connection is to an A.C. line.