MEASUREMENT AND INSTRUMENTATION QUIZ

Which meter is suitable for the measurement of 10mV at 50MHz?

VTVM

Moving coil voltmeter

CRO

Moving iron voltmeter

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Ampere is one of the

Units used to measure charge

Derived units

Base units

Supplementary units

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A megger is usually

Hot-wire type instrument

Moving iron type instrument

Electro-static type instrument

Moving coil type instrument

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The resistance can be measured most accurately by

Bridge method

Voltmeter-ammeter method

Megger

Multimeter

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The resistance of a circuit is found by measuring current flowing and the power fed into the circuit. If the limiting errors in the measurement of power and current are ± 1.5% and ± 1.0% respectively, the limiting error in the measurement of resistance

± 3.5%

± 1.5%

± 2.5%

± 1%

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Potentiometer method of DC voltage measurement is more accurate than direct measurement using a voltmeter because

It uses centre zero galvanometer instead of voltmeter.

It loads the circuit moderately.

It does not load the circuit at all.

It loads the circuit to maximum extent.

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

Square of the current

Sine of the measurand

Current

Squareroot of the current

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An ammeter of range 0-25 A has a guaranteed accuracy of 1% of full-scale reading. The current measured by the ammeter is 5 A. The limiting error in the reading is

5%

6%

3%

4%

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Electrostatic instruments are used as

Both ammeter and voltmeter

Ammeters only

Voltmeters only

Wattmeter only

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How many time-base circuits does a dual face CRO can have?

3.

4.

2.

1.

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