Which one of the following is not an electromechanical instrument ?
Correct answer: D. AC transformer and DC generator
- A. galvanometer
- B. voltmeter
- C. ammeter
- D. AC transformer and DC generator
Explanation
A galvanometer, ammeter and voltmeter are electromechanical measuring instruments because current produces mechanical motion or deflection. An AC transformer and a DC generator are electrical machines or devices rather than electrical measuring instruments. Students may choose c by treating an ammeter as purely electronic, although the traditional ammeter is based on electromechanical deflection.
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