BEE Fundamental Circuit Analysis 4

Question 1

In node voltage analysis, the reference node is also called the:

Accepted Answer

Datum node — both B and D are correct

Answer

The reference node (ground) is also called the datum node; both terms are correct and used interchangeably.

Question 2

What is the phase angle of the impedance in a circuit where R = 30 Ω and X_L = 40 Ω (purely inductive)?

Accepted Answer

53.13°

Answer

θ = arctan(X_L/R) = arctan(40/30) = arctan(1.333) ≈ 53.13°.

Question 3

Which of the following is a passive element that opposes a change in current?

Accepted Answer

Inductor

Answer

An inductor stores energy in a magnetic field and opposes changes in current through it (v = L di/dt).

Question 4

A 120 V source has an internal resistance of 5 Ω. What is the maximum power that can be delivered to a load?

Accepted Answer

720 W

Answer

At maximum power transfer (R_L = R_s = 5 Ω), P_max = V_s²/(4R_s) = 14400/20 = 720 W.

Question 5

Which law states that the algebraic sum of all currents entering and leaving a node equals zero?

Accepted Answer

Kirchhoff's Current Law

Answer

KCL, based on charge conservation, states that the sum of currents at any node is zero.

BEE - Bachelor of Electrical Engineering Practice Test