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Measurement and Instrumentation

Measurement and Instrumentation
Which of the quantity consists of unit as Pascal ?

 Force
 Pressure
 Temperature
 Impulse

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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

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

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Measurement and Instrumentation
For a circuit given that I = 2 ± 5 % A, R = 100 ± 0.2 % Ω the limiting error in the power dissipation I2 R in the resistor R is

 10.2%
 5.2%
 25.2%
 1.2%

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Measurement and Instrumentation
Dynamic errors are caused by

 human error
 observational error
 instrument not responding fast
 environmental error

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Measurement and Instrumentation
A PMMC voltmeter is connected across a series combination of a DC voltage source V1 = 2 V and an AC voltage source V2 = 3sin4t, the voltmeters reads

 2 V.
 (2 + √3/2)V.
 5 V.
 0 V.

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

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

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