CET Circuit Theory and Analysis 2

Question 1

In a series RLC circuit at resonance, the impedance is equal to:

Accepted Answer

The resistance R only

Answer

At resonance XL equals XC and they cancel, leaving only the resistance R as the total impedance.

Question 2

Thevenin's theorem states that any linear circuit can be replaced by:

Accepted Answer

A voltage source in series with an impedance

Answer

Thevenin's theorem replaces a complex linear network with a single voltage source (Vth) in series with a single impedance (Zth).

Question 3

The time constant of an RC circuit is defined as the time required for the capacitor voltage to reach approximately:

Accepted Answer

63.2% of its final value

Answer

One time constant (τ = RC) corresponds to the voltage reaching 63.2% (1 - 1/e) of its final value.

Question 4

Which network theorem is the dual of Thevenin's theorem?

Accepted Answer

Norton's theorem

Answer

Norton's theorem is the dual of Thevenin's theorem, replacing a network with a current source in parallel with an impedance.

Question 5

In a parallel RLC circuit, resonance occurs when the source current is:

Accepted Answer

At minimum value

Answer

At parallel resonance the tank circuit impedance is maximum, so the source current drawn is at its minimum value.

(CET) Certified Electronics Technician Practice Test