MEASUREMENT AND INSTRUMENTATION QUIZ

What is the expression for acceleration?

Mass x acceleration

Mass x velocity

Force x displacement

Change in velocity / time

TRUE ANSWER : ?
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Which of the following essential featuresis possessed by an indicating instrument?

Deflecting device

Controlling device

All of the listed here

Damping device

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In a portable instrument , the controlling torque is provided by

Gravity

Spring

Eddy currents

All of the listed here

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______ instruments are most sensitive.

Dynamometer

Hot wire

Permanent magnet moving coil

Moving iron

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The internal resistance of an ammeter should be

Very small

High

Medium

Infinity

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Assertion (A) : Precision is a necessary prerequisiteof accuracy. Reason (R) : Precision guarantees accuracy.

A is false bur R is true

Both A and R are true but R is NOT the correct explanation of A

Both A and R are true and R is the correct explanation of A

A is true but R is false

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The three resistors R1, R2 and R3 have the following ratings: R1 = 25Ω ± 4%, R2 = 65 Ω ± 4%; R3 =45 Ω ± 4%. If the resistance are connected in series, then limiting error produced in equivalent resistance is

2%

3%

4%

1%

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

Decreases

Increases

Remains same

None of the listed here

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PMMC Instrument can be used for

DC work only

None of the listed here

AC work only

Both AC and DC

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Jewels are used in instruments for the purpose of

Damping

Torque control

Bearing

Suppressing noise

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