## 56. If a sinusoidal wave has frequency of 50 Hz with 30 A r.m.s. current which of the following equation represents this wave?

## 57. The apparent power drawn by an A.C. circuit is 10 kVA and active power is 8 kW. The reactive power in the circuit is

## 58. What will be the phase angle between two alternating waves of equal frequency, when one wave attains maximum value the other is at zero value?

## 59. The effective resistance of an iron-cored choke working on ordinary supply frequency is more than its true resistance because of

## 60. Power factor of an inductive circuit is usually improved by connecting capacitor to it in

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