Answer is Option B. -> When the readings of the two watt-meters are equal but opposite sign, the power factor is zero Answer: (b).When the readings of the two watt-meters are equal but opposite sign, the power factor is zero
Question 7. The meter constant of a single-phase, 230 V induction watt-meter is 600 rev/kW-h. The speed of the meter disc for a current of 15 A at 0.8 power factor lagging will be?
Question 9. A coil (which can be modelled as a series RL circuit) has been designed for high Q performance. The voltage is rated at and a specified frequency. If the frequency of operation is increased 10 times and the coil is operated at the same rated voltage. The new value of Q factor and the active power P will be?