41. The voltage-flux adjustment of a certain 1-phase 220 V induction watt-hour meter is altered so that the phase angle between the applied voltage and the flux due to it is 85° (instead of 90°). The errors introduced in the reading of this meter when the rent is 5 A at pf of unity and 0.5 lagging are respectively
- -3.8 mW, -77.4 W
- 3.8 mW, 77.4 mW
- -4.2 W,-85.1 W
- 4.2 W, 85.1 W
42. An energy meter connected to an immersion heater (resistive) operating on an ac 230 V, 50 Hz, ac single phase source reads 2.3 units (kWh) in one hour. The heater is removed from the supply and now connected to a 400 V peak-to-peak square wave source of 150 Hz. The power in kW dissipated by the heater will be
- 3.478
- 1.739
- 1.540
- 0.870
