Measurement and Instrumentation
Assertion(A): A low power factor wattmeter has special constructional features to ensure accurate measurment. Reason(R): Extension of wattmeter range in DC circuit can be easily done by using current and potential transformer

 Both A and R is true and R is correct explanation of A C.
 A is true R is false.
 A is false R is true.
 Both A and R is true and R is not correct explanation of A.

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Measurement and Instrumentation
Which of following is not correct?

 A shunt should have a very low resistance.
 An ammeter should have a very low resitance.
 Voltmeter should have very high resistance.
  An electronic voltmeter draw appreciable current from the source.

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