CEP Electrical Theory & Principles 5

Question 1

Which of the following correctly describes the behavior of an ideal voltage source?

Accepted Answer

It maintains constant terminal voltage regardless of load current

Answer

An ideal voltage source has zero internal resistance and maintains its rated voltage regardless of the current drawn by the load.

Question 2

The phase angle (θ) of a series RL circuit with R = 30 Ω and XL = 40 Ω is:

Accepted Answer

53.13°

Answer

θ = arctan(XL/R) = arctan(40/30) = arctan(1.333) ≈ 53.13°, indicating current lags voltage by 53.13°.

Question 3

Eddy currents in transformer cores are minimized by:

Accepted Answer

Laminating the core with thin insulated sheets

Answer

Laminated cores break the eddy current paths into smaller, higher-resistance loops, reducing eddy current losses proportional to lamination thickness squared.

Question 4

The Q factor (quality factor) of a series resonant circuit is defined as:

Accepted Answer

Q = XL / R

Answer

The Q factor = XL/R (or XC/R) at resonance, representing the ratio of energy stored to energy dissipated per cycle.

Question 5

In the maximum power transfer theorem, maximum power is delivered to the load when:

Accepted Answer

Load resistance equals the source resistance

Answer

Maximum power transfer occurs when R_load = R_source (or Z_load = Z_source* for AC circuits), delivering 50% of source power to the load.

(CEP) Certified Electrical Professional Practice Test

(CEP) Certified Electrical Professional Practice Test

CEP Electrical Theory & Principles 5