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Measurement and Instrumentation

Measurement and Instrumentation
Resistance of a VARISTOR varies with

 Voltage
 Both Voltage and Temperature
 Current
 Temperature

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

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

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Measurement and Instrumentation
Two voltmeters have the same range 0-400V. The internal impedance are 30,000 Ohms and 20,000 Ohms. If they are connected in series and 600V be applied across them, the readings are

300V each
One of the meters out of the range and other 100V
360V and 240V
400V and 200V

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Measurement and Instrumentation
Which devices used to measure the temperature of an object ?

 Galvanometer
 Thermometers
 Poteintiometer
 Odometer

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Measurement and Instrumentation
The controlling torque of an indicating instrument ______ as the deflection of the moving system increases.

None of the listed here
Remains same
Decreases
Increases

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