railway RRB Technician Grade 1 Mock Test 2024 Electrical and Electronics Measurements Measurement of Power Measurement of Poly Phase Power
Which of the following methods is used to extend range of wattmeter?
1
By using series resistance on current coil
2
By using instrument transformer conjunction with voltage and current coil
3
By using series and parallel combination with current and voltage coil
4
By using series resistance on voltage coil