Circuit Theorems In Ac Analysis(Electrical Engineering ) Questions and Answers
Question 1. Referring to the given circuit, what is VTH if VS = 12 ∠0° V?
4.69 ∠38.7° V
9.38 ∠38.7° V
12 ∠0° V
6 ∠0° V
Explanation:-
Answer: Option B. -> 9.38 ∠38.7° V
Question 2. One circuit is equivalent to another, in the context of Thevenin's theorem, when the circuits produce the same voltage.
True
False
Explanation:-
Answer: Option B. -> False
Question 3. The two basic components of a Thevenin equivalent ac circuit are
The equivalent voltage source and the equivalent series impedance
The equivalent voltage source and the equivalent series resistance
The equivalent voltage source and the equivalent parallel impedance
The equivalent voltage source and the equivalent parallel resistance
Explanation:-
Answer: Option A. -> The equivalent voltage source and the equivalent series impedance
Question 4. Referring to the given circuit, find ZTH if VS is 180° V.
9.82 ∠-51.3° kΩ
9.38 ∠-51.3° kΩ
180 ∠-38.3° kΩ
19.2 ∠-38.3° kΩ
Explanation:-
Answer: Option B. -> 9.38 ∠-51.3° kΩ
Question 5. Determine VTH when R1 is 180 Ω and XL is 90 Ω.
135∠63.4° V
13.5∠63.4° V
12.2∠0° V
122∠0° V
Explanation:-
Answer: Option B. -> 13.5∠63.4° V
Question 6. For the given circuit, find VTH for the circuit external to RL.
4.69 ∠51.3° V
4.69 ∠38.7° V
469 ∠38.7° mV
6 ∠0° V
Explanation:-
Answer: Option B. -> 4.69 ∠38.7° V
Question 7. Referring to the given circuit, L
Must be in parallel with RL
Must be placed in parallel with VS
Must have a reactance equal to XC
Has no effect on the result
Explanation:-
Answer: Option D. -> Has no effect on the result
Question 8. The superposition theorem is useful for the analysis of single-source circuits.
True
False
Explanation:-
Answer: Option B. -> False
Question 9. Like Thevenin's theorem, Norton's theorem provides a method of reducing a more complex circuit to a simpler, more manageable form for analysis.
True
False
Explanation:-
Answer: Option A. -> True
Question 10. In an ac circuit, power to the load peaks at the frequency at which the load impedance is the complex conjugate of the output impedance.
