EETC Circuit Theory 3

Question 1

According to Kirchhoff's Voltage Law (KVL), the algebraic sum of all voltages around a closed loop equals:

Accepted Answer

Zero

Answer

KVL states that the algebraic sum of all voltage rises and drops around any closed loop must equal zero.

Question 2

A circuit has an impedance of 5 + j12 Ω. What is the magnitude of this impedance?

Accepted Answer

13 Ω

Answer

|Z| = √(5² + 12²) = √(25 + 144) = √169 = 13 Ω.

Question 3

Which type of filter passes low-frequency signals and attenuates high-frequency signals?

Accepted Answer

Low-pass filter

Answer

A low-pass filter allows frequencies below its cutoff frequency to pass while attenuating higher frequencies.

Question 4

In the Superposition Theorem, when analyzing the effect of one source, all other independent voltage sources are:

Accepted Answer

Replaced with short circuits

Answer

When applying the Superposition Theorem, independent voltage sources not being analyzed are replaced with short circuits (zero voltage).

Question 5

What is the resonant frequency of a series RLC circuit with L = 10 mH and C = 10 µF?

Accepted Answer

503 Hz

Answer

f₀ = 1/(2π√LC) = 1/(2π√(0.01 × 0.00001)) = 1/(2π × 0.000316) ≈ 503 Hz.

(EETC) Electrical Technician Certification Practice Test