MEASUREMENT AND INSTRUMENTATION QUIZ

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

It loads the circuit moderately.

It does not load the circuit at all.

It loads the circuit to maximum extent.

It uses centre zero galvanometer instead of voltmeter.

TRUE ANSWER : ?
YOUR ANSWER : ?

_______ is used to measure the flow of air around aeroplane.

Anemometer.

Orifice.

Venturimeter.

nucleus.

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Which wave has the least form factor?

Square wave

Triangular wave

Rectangular wave

Sine wave

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The resistance can be measured most accurately by

Megger

Multimeter

Voltmeter-ammeter method

Bridge method

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To measure high frequency currents, we mostly use ______ ammeter.

Dynamometer

Thermocouple

Moving iron

Hot wire

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How many fundamental units are there ?

8

7

6

4

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No eddy current and hysteresis losses occur in

Electrostatic instruments

Moving iron instruments

PMMC instruments

Electrodynamo meter instruments

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The internal resistance of an ammeter should be

Infinity

High

Medium

Very small

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The circuit in figure is used to measure the power consumed by the load. The current coil and the voltage coil of the wattmeter have 0.02 Ω and 1000 Ω resistance respectively. The measured power compared to the load power will be

0.2% more.

0.2% less.

0.4 more.

0.4% less.

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YOUR ANSWER : ?

The resistance offered to the passage of an in-varying current by a column of mercury at the temperature of melting ice of mass 14.4521 gms of uniform cross-sectional area and length 106.3cm is

One international ohm

One ohm according to working standards

One ohm according to SI units

Standard ohm

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