Circuit Theorems In Ac Analysis MCQs

Question 1

Referring to the given circuit, what is VTH if VS = 12 ∠0° V?

Accepted Answer

9.38 ∠38.7° V

Answer

4.69 ∠38.7° V

Answer

12 ∠0° V

Answer

6 ∠0° V

Question 2

Referring to the given circuit, find ZTH if VS is 180° V.

Accepted Answer

9.38 ∠-51.3° kΩ

Answer

9.82 ∠-51.3° kΩ

Answer

180 ∠-38.3° kΩ

Answer

19.2 ∠-38.3° kΩ

Question 3

Determine VTH when R1 is 180 Ω and XL is 90 Ω.

Accepted Answer

13.5∠63.4° V

Answer

135∠63.4° V

Answer

12.2∠0° V

Answer

122∠0° V

Question 4

The two basic components of a Thevenin equivalent ac circuit are

Accepted Answer

The equivalent voltage source and the equivalent series impedance

Answer

The equivalent voltage source and the equivalent series resistance

Answer

The equivalent voltage source and the equivalent parallel impedance

Answer

The equivalent voltage source and the equivalent parallel resistance

Question 5

One circuit is equivalent to another, in the context of Thevenin's theorem, when the circuits produce the same voltage.

Accepted Answer

False

Answer

True

Question 6

For the given circuit, find VTH for the circuit external to RL.

Accepted Answer

4.69 ∠38.7° V

Answer

4.69 ∠51.3° V

Answer

469 ∠38.7° mV

Answer

6 ∠0° V

Question 7

Like Thevenin's theorem, Norton's theorem provides a method of reducing a more complex circuit to a simpler, more manageable form for analysis.

Accepted Answer

True

Answer

False

Question 8

The superposition theorem is useful for the analysis of single-source circuits.

Accepted Answer

False

Answer

True

Question 9

Referring to the given circuit, L

Accepted Answer

Has no effect on the result

Answer

Must be in parallel with RL

Answer

Must be placed in parallel with VS

Answer

Must have a reactance equal to XC