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

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

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Measurement and Instrumentation
Consider the following statement - 1. The compensating coil of a low power factor wattmeter compensates the effect of the impedance of the current coil. 2. The compensating coil of a low power factor wattmeter compensates the effect of the impedance of the voltage coil circuit.

 1 is true but 2 is false.
  1 is false but 2 is true.
 Both 1 and 2 are true.
 Both 1 and 2 are false.

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Measurement and Instrumentation
In measurement system, the function of the signal manipulating elements is to

 to perform non liner operation like clipping filtering, chopping and clamping.
 change the quantity under measurement to an analogues signal.
 to perform linear operation like addition and multiplication.
 change the magnitude of the input signal while retaining its identity.

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