railway RRB JE (CBT I + CBT II) Mock Test 2024 Electrical and Electronics Measurements Indicating Instruments Electro Dynamometer Type Instruments
How many pressure coils and current coils, respectively, are present in a three-phase dynamometer wattmeter?
1
There is no pressure coil and no current coil
2
There are three pressure coils and three current coils
3
There is one pressure coil and one current coil
4
There are two pressure coils and two current coils