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Measurement and Instrumentation

Measurement and Instrumentation
A megger is usually

Moving iron type instrument
Hot-wire type instrument
Moving coil type instrument
Electro-static type instrument

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Measurement and Instrumentation
The core flux in the CT of above question no.6, under the given operating conditions is

 1000 mWb.
 0.
 225 mWb.
 450 mWb.

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Measurement and Instrumentation
A moving iron ammeter produces a full scale torque of 240 μNm with a deflection of 120° at a current of 10 A. The rate of change of self induction (μH/radian) of the instrument at full scale is

 12.0 μH/radian.
 114.6 μH/radian.
 4.8 μH/radian.
 2.0 μH/radian.

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Measurement and Instrumentation
An ammeter of range 0-25 A has a guaranteed accuracy of 1% of full-scale reading. The current measured by the ammeter is 5 A. The limiting error in the reading is

 6%
 3%
 4%
 5%

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Measurement and Instrumentation
When the pointer of an indicating instrument comes to rest in the final deflected position, ______

None of the listed here
Only controlling torque acts
Both deflecting and controlling torques act
Only deflecting torque acts

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Measurement and Instrumentation
The errors mainly caused by human mistakes are

 instrumental error.
  gross error.
 observational error.
 systematic error.

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