The reactance offered by a capacitor to alternating current of frequency 50 Hz is 20 ohms. If frequency is increased to 100 Hz, reactance becomes __________ ohms.

Which of the following refers to a parallel circuit?

A. The current through each element is same

B. The voltage across element is in proportion to it's resistance value

C. The equivalent resistance is greater than any one of the resistors

D. The current through any one element is less than the source current

In any A.C. circuit always

A. Apparent power is more than actual power

B. Reactive power is more than apparent power

C. Actual power is more than reactive power

D. Reactive power is more than actual power

The transient currents are associated with the

A. Changes in the stored energy in the inductors and capacitors

B. Impedance of the circuit

C. Applied voltage to the circuit

D. Resistance of the circuit

The inductance of a coil can be increased by

A. Increasing core length

B. Decreasing the number of turns

C. Decreasing the diameter of the former

D. Choosing core material having high relative permeability