FREE Bachelor of Electrical Engineering Measurement and Instrumentation Questions and Answers

Question 1

Which of the above measuring techniques does a bridge circuit use?

Accepted Answer

comparison

Answer

Bridge circuits, such as the Wheatstone bridge, are primarily used for precise measurement by comparing an unknown electrical quantity (like resistance, capacitance, or inductance) with a known standard. The bridge is balanced when the detector shows no current, indicating that the ratios of the impedances in the arms are equal. This comparison method allows for high accuracy.

Question 2

Which of the following approaches is most frequently used to gauge low resistance?

Accepted Answer

kelvin double bridge method

Answer

The Kelvin Double Bridge is specifically designed to accurately measure very low resistances, typically below 1 ohm. It effectively eliminates the errors caused by contact and lead resistances, which are significant when measuring small resistance values, by using a double set of ratio arms. This makes it the preferred method for such measurements.

Question 3

Which of the above techniques is used to test medium resistance?

Accepted Answer

Carey-Foster bridge method

Answer

The Carey-Foster bridge is a modification of the Wheatstone bridge, often used for accurately measuring medium resistances and for comparing two nearly equal resistances. It is particularly effective in minimizing errors due to lead resistances, making it a suitable choice for precision measurements in the medium resistance range.

Question 4

The most sensitive detector for a single frequency value is which one of the following?

Accepted Answer

tuned detector

Answer

A tuned detector, such as a tuned amplifier or a resonant circuit, is designed to be highly sensitive to a specific frequency while rejecting others. This makes it the most sensitive choice for detecting a signal at a single, known frequency in bridge circuits or communication systems, as it can filter out noise and interference.

Question 5

Which of the following describes an equilibrium for a bridge?

Accepted Answer

When no current flows

Answer

A bridge circuit is said to be in equilibrium (or balanced) when the potential difference between two specific points in the bridge is zero. This condition results in no current flowing through the detector connected between these points. At balance, the unknown component's value can be determined from the known values of the other bridge arms.

BEE - Bachelor of Electrical Engineering Practice Test

BEE - Bachelor of Electrical Engineering Practice Test

FREE Bachelor of Electrical Engineering Measurement and Instrumentation Questions and Answers