Induction type wattmeter - Requirement of phase difference

Q.  In induction type wattmeter both current and pressure coils are required. For obtaining the required phase difference
- Published on 10 Nov 15

a. Shaded pole principle is used
b. Two separate ac magnets are used
c. Only one ac magnets are used
d. All of these

ANSWER: Two separate ac magnets are used

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