FREE Bachelor of Electrical Engineering Measurement and Instrumentation Questions and Answers Flashcards

What is the primary advantage of a digital multimeter over an analog multimeter?

Answer: Higher input impedance and better accuracy

Digital multimeters offer higher input impedance (typically 10 MΩ or more) and superior accuracy compared to analog meters, reducing loading effects on the circuit under test.

In a Wheatstone bridge circuit at balance condition, what is the current through the galvanometer?

Answer: Zero

At balance, the potential difference across the galvanometer is zero, so no current flows through it.

Which type of error is caused by incorrect reading of an instrument's scale by the observer?

Answer: Parallax error

Parallax error occurs when the observer's line of sight is not perpendicular to the instrument scale, causing incorrect readings.

A LVDT (Linear Variable Differential Transformer) is used to measure which physical quantity?

Answer: Linear displacement

An LVDT converts linear displacement of its core into a proportional electrical voltage output through electromagnetic induction.

What does the resolution of a measuring instrument refer to?

Answer: The smallest change in input it can detect

Resolution is the smallest incremental change in the measured quantity that the instrument can detect or distinguish.

Which instrument is most suitable for measuring very high resistances in the megaohm range?

Answer: Megger (insulation resistance tester)

A megger applies a high DC voltage and measures the resulting small current to determine insulation resistance in the megaohm to gigaohm range.