Circuit Theorems And Conversions(Electrical Engineering ) Questions and Answers

Question 1. Transistors act basically as voltage sources.
  1.    True
  2.    False
Explanation:-
Answer: Option B. -> False
Question 2. Find the total current through R3 in the given circuit.
  1.    7.3 mA
  2.    5.5 mA
  3.    12.8 mA
  4.    1.8 mA
Explanation:-
Answer: Option D. -> 1.8 mA
Question 3. What is the Thevenin equivalent (VTH and RTH) for the circuit given?
  1.    6.4 V, 422 Ω
  2.    6.4 V, 560 Ω
  3.    6.4 V, 680 Ω
  4.    30 V, 422 Ω
Explanation:-
Answer: Option A. -> 6.4 V, 422 Ω
Question 4. Find RN for the circuit given.
  1.    34 Ω
  2.    68 Ω
  3.    120 Ω
  4.    154 Ω
Explanation:-
Answer: Option D. -> 154 Ω
Question 5. Determine $${I_{\text{N}}}$$ for the circuit consisting of VS, R1, R2 and R3 shown in the given circuit.
  1.    676 mA
  2.    245 mA
  3.    431 mA
  4.    75 mA
Explanation:-
Answer: Option B. -> 245 mA
Question 6. You cannot convert a voltage source to an equivalent current source, or vice versa.
  1.    True
  2.    False
Explanation:-
Answer: Option B. -> False
Question 7. Norton's equivalent current (IN) is an open-circuit current between two points in a circuit.
  1.    True
  2.    False
Explanation:-
Answer: Option B. -> False
Question 8. A certain voltage source has the values VS = 30 V and RS = 6 Ω. The values for an equivalent current source are
  1.    5 A, 6 Ω
  2.    30 A, 6 Ω
  3.    5 A, 30 Ω
  4.    30 A, 5 Ω
Explanation:-
Answer: Option A. -> 5 A, 6 Ω
Question 9. Find the current in R2 of the given circuit, using the superposition theorem.
  1.    16.7 mA
  2.    33.3 mA
  3.    50 mA
  4.    16.6 mA
Explanation:-
Answer: Option C. -> 50 mA
Question 10. A certain current source has the values IS = 4 µA and RS = 1.2 MΩ. The values for an equivalent voltage source are
  1.    4.8 µV, 1.2 MΩ
  2.    1 V, 1.2 MΩ
  3.    4.8 V, 4.8 MΩ
  4.    4.8 V, 1.2 MΩ
Explanation:-
Answer: Option D. -> 4.8 V, 1.2 MΩ
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