21. In a moving coil instrument, the deflecting torque is proportional to
22. In a moving iron meter, the deflecting torque is proportional to
23. Which wave has the least form factor?
24. The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures
25. Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are
26. The two pressure coils of a single phase power factor meter have
27. To measure the flux, devices used are based on
28. No eddy current and hysteresis losses occur in
29. The absolute measurement of resistance is done by
30. For power measurement of three phase circuit by two wattmeter method, when the value of power factor is less than 0.5 lagging
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