Metrology | MCQs

Explanation

The standard meter and kilogram are made from an alloy of platinum and iridium to ensure durability and accuracy.

This alloy is used because it resists corrosion and retains its shape over time, crucial for precise measurement.

Explanation

A screw gauge (micrometer) measures very small lengths with high precision, up to 0.01 mm.

It is commonly used to measure wire thickness and small objects accurately.

Explanation

Always select the maximum range of the current meter while measuring the current of an unknown wire.

This prevents potential damage to the meter and ensures accurate measurements if the current is unexpectedly high.

Explanation

Accuracy is defined as the measure of how close an instrument's readings are to the true value.

It indicating how error-free it is.

Explanation

Reliability is a measurement of consistency.

Reliability refers to the consistency of a measure

Validity refers to the accuracy of a measure

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Explanation

Before measuring with an oscilloscope, it must be calibrated:

Voltage wise: For accurate voltage readings.

Time wise: For precise timing and frequency.

Frequency wise: For correct frequency measurement.

Wave shape wise: To ensure accurate waveform display.

Explanation

As the value of AWG increases, the thickness of the wire decreases.

The American Wire Gauge (AWG) system assigns smaller numbers to thicker wires and larger numbers to thinner wires.

Explanation

For measuring small resistance, we use the Kelvin Bridge.

This bridge is designed to provide accurate measurements of very low resistances by compensating for the resistance of the measuring leads.