Dynamometer Type Wattmeter Multiple Choice Questions and Answers


16. A dynamometer type wattmeter has


   A.Square law scale

   B.Non-linear scale

   C.Logarithmic scale

   D.Uniform scale


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D.Uniform scale

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17. Which of the following methods is used to shield a dynamometer type wattmeter against stray fields


   A.Meter components are made of non-magnetic materials

   B.Meter is housed in a soft iron case

   C.Neutral wire connection is provided

   D.Meter is earthed


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B.Meter is housed in a soft iron case

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18. A wattmeter will be free from the effects of power factor and frequency variations in case


   A.Voltage coil resistance is zero

   B.Damping is not provided

   C.Pressure coil inductance is zero

   D.A capacitance is connected in parallel to pressure coil


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A.Voltage coil resistance is zero

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19. The minimum number of wattmeters required to measure power in an unbalanced three-wire system is


   A.One

   B.Two

   C.Three

   D.Four


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B.Two

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20. An induction wattmeter measures


   A.Only the true power

   B.The reactive power

   C.The apparent power

   D.The true power and the reactive power


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A.Only the true power

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