BEE Electric Circuits 5

Question 1

In nodal analysis, what is chosen as the reference node?

Accepted Answer

The node with the most connections (ground)

Answer

The reference (ground) node is typically chosen as the node with the most connections to simplify the analysis.

Question 2

Which of the following correctly describes apparent power S in an AC system?

Accepted Answer

S = Vrms × Irms

Answer

Apparent power S = Vrms × Irms in volt-amperes (VA), representing the total power supplied by the source.

Question 3

A 50 mH inductor carries a current of 4 A. How much energy is stored?

Accepted Answer

0.4 J

Answer

Energy stored in an inductor: E = ½LI² = ½ × 0.05 × 16 = 0.4 J.

Question 4

What is the phase relationship between voltage and current in a purely resistive AC circuit?

Accepted Answer

In phase (0° difference)

Answer

In a purely resistive circuit, voltage and current are in phase because resistance does not introduce any phase shift.

Question 5

When two inductors L1 and L2 are connected in series (no mutual coupling), the total inductance is:

Accepted Answer

L1 + L2

Answer

Series inductors without mutual coupling simply add: Ltotal = L1 + L2.

BEE - Bachelor of Electrical Engineering Practice Test