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Measurement and Instrumentation

Measurement and Instrumentation
Which one of the following units is a fundamental unit?

 Watt
 Newton
 Joule/sec
 Ampere

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Measurement and Instrumentation
The coil of a moving iron instrument has a resistance of 500 ohm and inductance of 1 H. It reads 250 V when a 250 V DC is applied. It series resistance is 2000 ohms its reading when fed by 250 V, 50 Hz AC will be

 252 V.
 260 V.
 250 V.
 248 V.

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Measurement and Instrumentation
Kelvin’s double bridge is used to measure low resistance because

 effect of contact and lead resistance is eliminated.
 it has high sensitivity.
 there is no thermo electric emf.
 resistance variation due to temperature.

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Measurement and Instrumentation
The thermocouple instruments do not have

Independence of ambient temperature
High sensitivity
High degree of measuring accuracy
Absence of frequency error

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Measurement and Instrumentation
Following is a 16-bit register for 8085 microprocessor

 Register B
 Accumulator
 Stack pointer
 Register C

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Measurement and Instrumentation
The effect of stray magnetic fields on the actuating torque of a portable instrument is maximum when the operating field of the instrument and stray fields are

 parallel.
 perpendicular.
 inclined at 30o.
 inclined at 60o.

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