engineering recuitment NMDC Junior Officer (Trainee) Mock Test 2024 Electrical and Electronics Measurements Potentiometers
Which of the following statements is INCORRECT with regard to potentiometers?
1
They can be used for a.c. magnetic testing.
2
They are basically null-type instruments.
3
Standardization of d.c potentiometers is done using d.c. standard sources.
4
Standardization of a.c potentiometers is done using a.c. standard sources.