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Measurement and Instrumentation

Measurement and Instrumentation
If the instrument is to have a wide range, the instrument should have

Logarithmic scale
Exponential scale
Linear scale
Square-law scale

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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

 100 W.
  0 W.
 25 W.
 50 W.

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Measurement and Instrumentation
The EMF of Weston standard cell is measured using

Moving- iron meter
Moving-coil meter
Digital Volt meter
Potentiometer

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Measurement and Instrumentation
The watt hour meter is ______ instrument.

An indicating
A transfer
A recording
An integrating

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Measurement and Instrumentation
The internal resistance of a milli-ammeter must be very low for

 high sensitivity.
 high accuracy.
 high precision.
 minimum effect on the current in the circuit.

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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

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

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