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Measurement and Instrumentation

Measurement and Instrumentation
In a moving coil instrument, the deflecting torque is proportional to

Squareroot of the current
Square of the current
Current
Sine of the measurand

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Measurement and Instrumentation
Which of the following devices should be used for accurate measurement of low D.C. voltage?

None of these
Small range thermocouple voltmeter
C. potentiometer
Small range moving coil voltmeter

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Measurement and Instrumentation
A slide wire potentiometer has 10 wires of 1 m each. With the help of a standard voltage source of 1.018 V it is standardised by keeping the jockey at 101.8 cm. If the resistance of the potentiometer wires is 1000 ohm, then the value of the working current will be

 0.5 mA.
 1mA.
 100 mA.
 10 mA.

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

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

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Measurement and Instrumentation
A permanent magnet moving coil ammeter is connected in 50 Hz a. c. Circuit in which 5A current is flowing. The meter will read

2.5 A
None of the listed here
5 A
0 A

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Measurement and Instrumentation
A spring-controlled moving iron voltmeter draws a current of 1 mA for full scale value of 100V. If it draws a current of 0.5 mA, the meter reading is

 50 V.
 100 V.
 200 V.
 25 V.

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