FREE Bachelor of Electrical Engineering Basic Electrical Questions and Answers

Question 1

In an AC circuit, which of the following accurately depicts the average value?

Accepted Answer

RMS value/Form factor

Answer

In an AC circuit, the form factor is defined as the ratio of the RMS (Root Mean Square) value to the average value of a waveform. Therefore, to find the average value, you can rearrange this relationship: Average Value = RMS Value / Form Factor. This formula allows for the calculation of the average value when the RMS value and form factor are known.

Question 2

Who developed an approach to measure current and defined electric current?

Accepted Answer

Andre-Marie Ampere

Answer

André-Marie Ampère was a pioneering French physicist and mathematician who made fundamental contributions to the understanding of electromagnetism. He developed the theory of electrodynamics and formulated Ampère's law, which describes the relationship between electric current and the magnetic field it produces. The unit of electric current, the ampere, is named in his honor.

Question 3

How many electrons are required to produce a 2 Coulomb electric charge?

Accepted Answer

12.48 * 1018 electrons

Answer

The charge of a single electron is approximately 1.602 x 10^-19 Coulombs. To determine the number of electrons required to produce a 2 Coulomb electric charge, you divide the total charge by the charge of one electron. Calculation: 2 C / (1.602 x 10^-19 C/electron) ≈ 1.248 x 10^19 electrons, which can also be written as 12.48 x 10^18 electrons.

Question 4

Which of the following statements regarding direct current is true?

Accepted Answer

Can be transported to larger distances with less loss in power

Answer

While conventional DC transmission has higher losses over long distances compared to AC, High-Voltage Direct Current (HVDC) transmission systems are specifically designed to transport power over very long distances with significantly less loss than equivalent AC systems. HVDC is particularly advantageous for submarine cables and long-haul overhead lines, making this statement true in the context of modern power transmission technologies.

Question 5

Who was the first person to experience the power of magnetism?

Accepted Answer

Hans Christian Orsted

Answer

Hans Christian Ørsted, a Danish physicist, made the groundbreaking discovery in 1820 that electric currents produce magnetic fields. He observed that a compass needle deflected when placed near a wire carrying an electric current, demonstrating the fundamental connection between electricity and magnetism and laying the foundation for electromagnetism.

BEE - Bachelor of Electrical Engineering Practice Test

BEE - Bachelor of Electrical Engineering Practice Test

FREE Bachelor of Electrical Engineering Basic Electrical Questions and Answers