CET DC Circuit Analysis & Theory 4

Question 1

Thévenin's theorem states that any linear DC network can be reduced to:

Accepted Answer

A single voltage source in series with a resistance

Answer

Thévenin's theorem replaces any linear two-terminal network with an equivalent V_th in series with R_th.

Question 2

To find the Thévenin resistance (R_th) of a circuit, you should:

Accepted Answer

Short all current sources and open all voltage sources, then measure resistance at the terminals

Answer

Independent voltage sources are shorted and independent current sources are opened when deactivating sources to find R_th.

Question 3

The superposition theorem applies only to circuits that are:

Accepted Answer

Linear bilateral

Answer

Superposition requires linearity and bilaterality so that each source's contribution can be analyzed independently and summed.

Question 4

Using superposition, you analyze a two-source circuit and find source A contributes 4 A and source B contributes −1 A through a branch. The actual current is:

Accepted Answer

3 A

Answer

Superposition sums all individual contributions: 4 + (−1) = 3 A.

Question 5

Norton's equivalent circuit consists of:

Accepted Answer

A current source in parallel with a resistor

Answer

The Norton equivalent replaces a network with I_N (short-circuit current) in parallel with R_N (= R_th).

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(CET) Certified Euthanasia Technician Practice Test

CET DC Circuit Analysis & Theory 4