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Measurement and Instrumentation

Measurement and Instrumentation
A 1 mA meter is to be converted to 1 A ammeter. The meter resistance is 100 Ω. The value of shunt resistance

 0.001 Ω.
 1000 Ω.
 100 Ω.
 0.1001 Ω.

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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

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

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Measurement and Instrumentation
______ instruments are most sensitive.

Moving iron
Hot wire
Permanent magnet moving coil
Dynamometer

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Measurement and Instrumentation
No eddy current and hysteresis losses occur in

Electrostatic instruments
PMMC instruments
Electrodynamo meter instruments
Moving iron instruments

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Measurement and Instrumentation
A null type instrument as compared to a deflected type instrument has

 a lower sensitivity.
All of these
 a higher accuracy.
 a faster response.

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Measurement and Instrumentation
The internal resistance of an ammeter should be

Medium
High
Very small
Infinity

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