Measurement and Instrumentation
In a wheatstone bridge, a change of 6 Ω in the unknown arm of bridge is required to produce a change in deflection of 2.4 mm of the galvanometer. The sensitivity is

 0.8 mm/Ω
 5.0 mm/Ω
 0.4 mm/Ω
 2.5 mm/Ω

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Measurement and Instrumentation
Which of following statement are correct in case of power factor meter?

 Both B and C.
 The restoring torque is provided by a controlling torque.
 It consist of two coils mounted at right angles to each other.
 The deflection is proportional to phase angle between field coil and crossed coil.

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