Which of the following types of instrument can be used for D.C only?
Which of the following types of instrument can be used for D.C only?
Right Answer is:
Permanent magnet type
SOLUTION
The PMMC type can be used for dc measurements only, and the induction type for ac measurements only.
Induction-type instruments work on AC supply only. This is based on the principle of induction motor, therefore called induction type instrument.
| Meter | Measuring quantity |
| Permanent Magnet Type ammeter | DC current |
| Induction type ammeter | AC current |
| Moving iron voltmeter | AC and DC voltage |
| Moving iron ammeter | AC and DC current |