BEE Measurement and Instrumentation 5

Question 1

Hysteresis error in a measurement system means the output depends on:

Accepted Answer

The direction from which the input is approached

Answer

Hysteresis causes different output readings for the same input depending on whether the input is increasing or decreasing.

Question 2

Which instrument is best suited for measuring very low resistances (below 1 Ω) accurately?

Accepted Answer

Kelvin double bridge

Answer

The Kelvin double bridge eliminates the error due to lead and contact resistance by using a second set of ratio arms, making it ideal for milliohm measurements.

Question 3

In a spectrum analyzer, the x-axis represents:

Accepted Answer

Frequency

Answer

A spectrum analyzer displays signal amplitude (power or voltage) as a function of frequency, unlike an oscilloscope which uses time on the x-axis.

Question 4

The accuracy of an instrument is best defined as:

Accepted Answer

The closeness of the measured value to the true value

Answer

Accuracy is the degree of conformity between the instrument's reading and the true value of the quantity being measured.

Question 5

A power factor meter used in a single-phase circuit has how many current coils and voltage coils?

Accepted Answer

One current coil and two voltage coils

Answer

A single-phase power factor meter has one current coil carrying load current and two crossed voltage coils — one in series with a resistor and one in series with an inductor.

BEE - Bachelor of Electrical Engineering Practice Test

BEE - Bachelor of Electrical Engineering Practice Test

BEE Measurement and Instrumentation 5