Which of the following types of instrument can be used for D.C only?
Right Answer is:
Permanent magnet type
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.
|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|