MEASUREMENT AND INSTRUMENTATION QUIZ

What is the standard unit for length ?

Kilometer

Inch

Meter

Centimeter

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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

0 A

5 A

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Which of the following are integrating instruments?

Wattmeters

Ampere hour and watt hour meters

Ammeters

Voltmeters

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A moving coil permanent magnet instrument can be used as ______ by using a low resistance shunt.

Ammeter

Flux meter

Voltmeter

Ballastic galvanometer

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A thermo couple ammeter gives full scale deflection of 10 A, when it reads one fifth of the scale, the current will be

5.78 A.

2 A.

4.47 A.

4 A.

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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 source other than the source of unknown voltage.

A battery.

Any of above.

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The quantity 1/√(∈0 × μ0) in SI units has the

dimension LT-1.

both ‘a’ and ‘b’.

none of these.

speed of light.

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The thermocouple instruments do not have

High sensitivity

Independence of ambient temperature

Absence of frequency error

High degree of measuring accuracy

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The function of shunt in an ammeter is to

By pass the current

Increase the sensitivity of the ammeter

Increase the resistance of ammeter

None of the listed here

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In a moving iron meter, the deflecting torque is proportional to

Square of the current through the coil

Sine of the measurand

Current through the coil

Squareroot of the measurand

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