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Measurements and Instrumentation - Engineering

Q1:

A permanent magnet moving coil meter can be used as

A ac only

B dc only

C both ac and dc

D low frequency ac and dc

ANS:D - low frequency ac and dc

Yes @Rit, it can only be used for dc measurement as during the negative half cycle of ac direction of torque applied will be reversed and average value of the applied torque during positive and negative half will be zero, and there will be no deflection in the pointer.