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A 50 Hz bar primary CT has a secondary with 500 turns. The secondary supplies 5 A current into a purely resistive burden of 1Ω. The magnetizing ampere-turn is 200. The phase angle between the primary and secondary current is
4.6o.
175.4o.
85.4o.
94.6o.
4.6o.
175.4o.
85.4o.
94.6o.
Answer
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Measurement and Instrumentation
A Manganin swap resistance is connected in series with a moving coil ammeter consisting of a milli ammeter and a suitable shunt in order to
Minimize the effect of temperature variation.
Reduce the size of the meter.
Obtaine large deflecting torque.
Minimize the effect of stray magnetic fields.
Minimize the effect of temperature variation.
Reduce the size of the meter.
Obtaine large deflecting torque.
Minimize the effect of stray magnetic fields.
Answer
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Measurement and Instrumentation
Which amplifier in used in an electronic amplifier?
Differential amplifier.
Power amplifier.
Butter amplifer.
Wideband amplifier.
Differential amplifier.
Power amplifier.
Butter amplifer.
Wideband amplifier.
Answer
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Measurement and Instrumentation
Wagner earthing device is used to eliminate errors due to
None of these
Electromagnetic coupling
Both A and B
Electrostatic coupling
None of these
Electromagnetic coupling
Both A and B
Electrostatic coupling
Answer
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Measurement and Instrumentation
A 0 - 200 V voltmeter has a guaranteed accuracy of 1% of full scale reading. The voltage measured by this instrument is 50 V. What is the limiting error?
3%
4%
5%
2%
3%
4%
5%
2%
Answer
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Measurement and Instrumentation
The spring material used in a spring control device should have the following property.
Should non magnetic
Most be of low temperature co-efficient
All of the listed here
Should have low specific resistance
Should non magnetic
Most be of low temperature co-efficient
All of the listed here
Should have low specific resistance
Answer
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