MEASUREMENT AND INSTRUMENTATION QUIZ

Figure show an RC potentiometer to measure AC voltage. It is desire that Vo/Vi should be independent of frequency. The value of C shoud be

0.09 µF.

0.1 µF.

11 µF.

10 µF.

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The terminals across the source are ______________________________ if a current source is to be neglected.

replaced by a capacitor

short circuited

open circuited

replaced by a source resistance

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Following is a 16-bit register for 8085 microprocessor

Register B

Stack pointer

Accumulator

Register C

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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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Most sensitive galvanometer is

Duddle galvanometer

Spot ballastic galvanometer

Vibration galvanometer

Elastic galvanometer

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The use of thermocouple meters for AC measurement leads to scale which is

expontial.

square law.

logarithmic.

linear.

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A voltage of 2.70 V is being measured by an analog indicating instrument having a scale range of 0 – 5.0 V. If the instrument reads 2.65 V, then absolute error in measurement is

0.01V

0.05V

0.25V

0.01V

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Alternating current is measured by

Electrostatic ammeter

Moving iron repulsion type voltmeter

Induction ammeter

Permanent magnet type ammeter

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The effect of stray magnetic fields on the actuating torque of a portable instrument is maximum when the operating field of the instrument and stray fields are

inclined at 60o.

inclined at 30o.

perpendicular.

parallel.

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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

5 A

0 A

None of the listed here

2.5 A

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