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Measurement and Instrumentation

Measurement and Instrumentation
The problem of Electrostatic coupling in a transformer is acute at

High load on the transformer
Power frequencies
Low frequencies
High frequencies

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Measurement and Instrumentation
If two 300V full scale voltmeters V1 and V2 having sensitivities of 100 kOhm/V and 150 kOhm/V are connected in series to measure 500V then

 V1 = 300V and V2 = 200V.
 V1 = 250V and V2 = 250V.
 V1 = 200V and V2 = 300V.
 V1 = 0V and V2 = 0V.

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Measurement and Instrumentation
______ movement is most expensive.

None of the listed here
D'Arsonval movement
Moving iron
Dynamometer

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Measurement and Instrumentation
No eddy current and hysteresis losses occur in

Electrostatic instruments
Electrodynamo meter instruments
Moving iron instruments
PMMC instruments

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Measurement and Instrumentation
The difference between the indicated value and the true value of a quantity is

 Relative error
 Absolute error
 Gross error
 Dynamic error

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Measurement and Instrumentation
The total current I = I1 + I2 in a circuit is measured I1 = 150 ± 3A , I2 = 250 ± 4 A, where the limits of error are given as standard deviations. I is measured as

 (400 ± 1) A
 (400 ±5) A
 (400 ± 2.24) A
 (400 ± 3) A

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