BEE FREE Bachelor of Electrical Engineering Basic Electrical Questions and Answers 3

Question 1

What does a zener diode primarily regulate in a circuit?

Accepted Answer

Voltage

Answer

A zener diode operates in reverse breakdown to maintain a constant voltage across its terminals.

Question 2

According to Kirchhoff's Current Law, what is the sum of currents entering a node?

Accepted Answer

Equal to the sum of currents leaving the node

Answer

Kirchhoff's Current Law states that the algebraic sum of currents at any node is zero, meaning currents in equal currents out.

Question 3

What is the resonant frequency of a series RLC circuit with L = 1 mH and C = 1 microfarad?

Accepted Answer

Approximately 5,033 Hz

Answer

The resonant frequency is 1/(2*pi*sqrt(LC)), which equals approximately 5,033 Hz for these values.

Question 4

What type of motor uses a commutator and brushes for operation?

Accepted Answer

DC motor

Answer

DC motors use a commutator and brushes to reverse current direction in the armature windings for continuous rotation.

Question 5

In a balanced three-phase system, what is the phase angle between consecutive phases?

Accepted Answer

120 degrees

Answer

A balanced three-phase system has three voltages separated by 120 degrees, equally dividing the 360-degree cycle.

BEE - Bachelor of Electrical Engineering Practice Test