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Measurement and Instrumentation

Measurement and Instrumentation
Piezoelectric effect is carried out in

  crystal filter.
  constant k prototype.
  m derived.
  composite filter.

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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

 ± 6%
 ± 7%
 ± 8%
 ± 5%

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Measurement and Instrumentation
In a megger controlling torque is provided by

Gravity
Eddy current
Coil
Spring

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Measurement and Instrumentation
When checked with an ohm meter an open resistor reads

  high but within tolerance.
  infinite.
  zero.
  low but not zero.

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Measurement and Instrumentation
Which of the following instruments can be used to measure AC current only?

Moving iron voltmeter
Moving iron ammeter
Induction type ammeter
Permanent Magnet Type ammeter

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Measurement and Instrumentation
The inductance of a certain moving iron ammeter is expressed as L = 2+5θ-θ2 µH. The control spring torque is 2 × 10-6 Nm/radian. Find the deflection in radians for a current of 2A.

 5
 1
 4
 2

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