Measurement and Instrumentation
A variable w is related to three other variables x, y and z as w = xy/z. The variables are measured with meters of accuracy ± 0.5% reading, ± 1% of full scale value and ± 1.5% reading. The actual readings of the three meters are 80, 20 and 50 with 100 being the full scale value for all three. The maximum uncertainty in the measurement of w will be

 ± 8%
 ± 7%
 ± 5%
 ± 6%

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Measurement and Instrumentation
Which of following is not correct?

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

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

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

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Measurement and Instrumentation
Why is a MISC meter not recommended for DC measurement?

The meter is calibrated for AC and it’s error for DC would be high
The error is high due to hysteresis effect
The meter does not respond to DC signals
The error is high due to eddy current effect

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