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Measurement and Instrumentation

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

Power frequencies
High frequencies
High load on the transformer
Low frequencies

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Measurement and Instrumentation
The current ‘I’ through a resistance R is measures with the following uncertainties I = 4 A ± 0.5%, R = 100Ω±0.2%. If power is computed from these two measured quantities, the uncertainty in the power computed will be

 1.5%
 1%
 0.5%
 1.2%

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Measurement and Instrumentation
The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures

Active power in R phase
Reactive power of R phase
Power proportional to 3 phase power if the load is balanced
Active power of Y phase

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Measurement and Instrumentation
Ratio of readings of two wattmeter connected to measure power in a balanced 3-phase load is 5:3 and the load is inductive. The power factor at load is

 0.6 lag.
 0.917 lead.
 0.917 lag.
 0.6 lead.

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Measurement and Instrumentation
The measured value of a resistance is 10.25 ohm, whereas its value of 10.22 ohm. What is absolute error of the measurement?

 0.01 ohm.
 10.26 ohm.
  0.03 ohm.
 15.36 ohm.

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Measurement and Instrumentation
A wheatstone bridge cannot be used for precision measurements because errors are introduced into on account of

 Thermoelectric emfs.
 Contact resistance.
 All of above.
 Resistance of connecting leads.

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MORE MCQ ON Measurement and Instrumentation

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