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Measurement and Instrumentation

Measurement and Instrumentation
Relative error is same as

 true error.
None of these
 ratio of absolute error and true value.
 absolute error.

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Measurement and Instrumentation
A moving coil of a meter has 100 turns, and a length and depth of 10 mm and 20 mm respectively. It is postioned in a uniform radial flux density of 200 mT. The coil carries a current of 50 mA. The torque on the coil is

 2 Nm.
 100 Nm.
 1 Nm.
  200 Nm.

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Measurement and Instrumentation
A thermo couple ammeter gives full scale deflection of 10 A, when it reads one fifth of the scale, the current will be

 5.78 A.
 4 A.
 2 A.
  4.47 A.

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Measurement and Instrumentation
Which of the following are integrating instruments?

Ampere hour and watt hour meters
Voltmeters
Ammeters
Wattmeters

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Measurement and Instrumentation
The maximum percentage error in the sum of two voltage measurements when V1 = 100V ± 1% and V2 = 80V ± 5% is

 ± 4%
 ± 2.8%
 ± 6%
 ± 3%

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Measurement and Instrumentation
The meter constant of a single phase 240 V induction watthour meter is 400 revolutions per KWh. The speed of the meter disc for a current of 10 Amperes of 0.8 p.f lagging will be

  12.8 rpm.
 16.02 rpm.
 18.2 rpm.
 21.1 rpm.

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