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Measurement and Instrumentation

Measurement and Instrumentation
In a megger controlling torque is provided by

Gravity
Eddy current
Coil
Spring

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Measurement and Instrumentation
The spring material used in a spring control device should have the following property.

Should have low specific resistance
Most be of low temperature co-efficient
All of the listed here
Should non magnetic

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Measurement and Instrumentation
A DC potentiometer is designed to measure up to about 2V with a slide wire of 800 mm. A standard cell of emf 1.18 V obtains balances at 600 mm. A test cell is seen to obtain balance at 680 mm. The emf of test cell is

 1.7 V.
 1 V.
 1.5 V.
 1.34 V.

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Measurement and Instrumentation
An electric pyrometer is an instrument used to measure

Phase
Frequency
None of the listed here
High temperatures

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Measurement and Instrumentation
The three resistors R1, R2 and R3 have the following ratings: R1 = 25Ω ± 4%, R2 = 65 Ω ± 4%; R3 =45 Ω ± 4%. If the resistance are connected in series, then limiting error produced in equivalent resistance is

 3%
 2%
 1%
 4%

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Measurement and Instrumentation
A voltage of 2.70 V is being measured by an analog indicating instrument having a scale range of 0 – 5.0 V. If the instrument reads 2.65 V, then absolute error in measurement is

 0.01V
 0.25V
 0.01V
 0.05V

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