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Measurement and Instrumentation

Measurement and Instrumentation
Which one of the following units is a fundamental unit?

 Ampere
 Newton
 Watt
 Joule/sec

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Measurement and Instrumentation
A sampling wattmeter is used to measure the average power of a load. The peak to peak voltage of a square wave is 10 V and the current is triangular wave of 5 Amp P-P as shown in the figure. The period is 20 ms. The reading in W will be

 25 W.
  0 W.
 100 W.
 50 W.

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Measurement and Instrumentation
The limiting errors of measurement of power consumed by and the current passing through a resistance are ±1.5% and ±1% respectively. What is the limiting error ( in %) of measurement of resistance ?

 ± 2.5%
 ±3.5%
 ± 1%
 ± 1.5%

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Measurement and Instrumentation
The inductance of a certain moving iron ammeter is expressed as L = 2+5θ-θ2 µH. The control spring torque is 2 × 10-6 Nm/radian. Find the deflection in radians for a current of 2A.

 1
 4
 5
 2

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Measurement and Instrumentation
For measuring an AC voltage by an AC potentiometer it is desirable that the supply for the potentiometer is taken from

 The same source as the unknown voltage.
 A battery.
 Any of above.
 A source other than the source of unknown voltage.

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Measurement and Instrumentation
A moving iron ammeter may be compensated for frequency errors by

Series resistance
A shunt resistance
Shunt capacitance
A series inductance

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