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1. In a transformer the tappings are generally provided on
4. The purpose of providing iron core in a step-up transformer is
2. Spacers are provided between adjacent coils
5. Pure inductive circuit takes power from the A.C. line when
3. Which of the following waves has the highest value of peak factor ?
2. The product of apparent power and cosine of the phase angle between circuit voltage and current is
1. The peak value of a sine wave is 200 V. Its average value is
