MEASUREMENT AND INSTRUMENTATION QUIZ

A moving iron ammeter may be compensated for frequency errors by

A series inductance

Shunt capacitance

Series resistance

A shunt resistance

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A metal strain gauge has a gauge factor of two. Its nominal resistance is 120 ohms. If it undergoes a strain of 10-5, the value of change of resistance in response to the strain is

0.0024 Ohm.

0.0012 Ohm.

240 Ohm.

120 Ohm.

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The resistance of a circuit is measured from the relation R= P/I2, where P is the power fed into the circuit and I is the current flowing through it. If the limiting errors in the measurement of power and current are respectively ± 1.0% and ± 1.0%, then what will be the limiting error in measurement of resistance ?

± 1.5%

±3.5%

±0.5%

± 3.0%

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Which amplifier in used in an electronic amplifier?

Butter amplifer.

Power amplifier.

Wideband amplifier.

Differential amplifier.

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Dynamic errors are caused by

observational error

instrument not responding fast

environmental error

human error

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In a ballistic galvanometer, the deflecting torque is proportional to

The current through coil

Square-root of current through coil

Sine of measured

Square of current through coil

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A moving iron instrument can be used for

AC only

Both DC& AC

DC only

None of the listed here

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Most accurate measurement of unknown resistance will be by

Potentiometer

Ohmmeter

Voltmeter and ammeter

Wheatstone bridge

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The rectifier instrument is not free from

Temperature error

Frequency error

Wave shape error

All of the listed here

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Induction wattmeter can measure

Both AC and DC

Dc power only

None of the listed here

Ac power only

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