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Measurement and Instrumentation

Measurement and Instrumentation
The error of an instrument is normally given as a percentage of

Rms value
Full-scale value
Measured value
Mean value

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

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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

 25.2%
 5.2%
 1.2%
 10.2%

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Measurement and Instrumentation
In induction type ammeter, _____ damping is provided.

None of the listed here
Fluid friction
Air friction
Eaddy current

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Measurement and Instrumentation
When testing a coil having a resistance of 10 ohms, resonance occurred when the oscillator frequency was 10 MHz and rotating capacitor was set at 500/2π pF. The effective value of the Q of the coil is

 20.
 31.4.
 54.2.
 25.4.

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Measurement and Instrumentation
To measure ac as well as dc power, we use

None of the listed here
Induction wattmeter
Sometimes induction and sometimes dynamometer wattmeter
Dynamometer wattmeter

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MORE MCQ ON Measurement and Instrumentation

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