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Circuit Theorems And Conversions MCQ Questions & Answers | Electrical Engineering

Learn Circuit Theorems And Conversions MCQ questions & answers are available for a Electrical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Circuit Theorems And Conversions MCQ question is the important chapter for a Electrical Engineering and GATE students. Page-3 section-1

21
Find the Thevenin equivalent (VTH and RTH) between terminals A and B of the circuit given.
Circuit Theorems and Conversions mcq question image
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Answer: Option B
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22
In a two-source circuit, one source acting alone produces 12 mA through a given branch. The other source acting alone produces 10 mA in the opposite direction through the same branch. The actual current through the branch is
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Answer: Option D
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23
An ideal current source has zero internal resistance.
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Answer: Option B
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24
A practical voltage source has a nonzero internal resistance.
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Answer: Option A
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25
An ideal voltage source has zero internal resistance.
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Answer: Option A
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26
A practical current source has a finite internal resistance.
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Answer: Option A
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27
A 680 Ω load resistor, RL, is connected across a constant current source of 1.2 A. The internal source resistance, RS, is 12 kΩ. The load current, RL, is
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Answer: Option D
Solution:
The load current is determined by analyzing the circuit and applying Ohm's law and the voltage-divider principle.

Given:

Load resistance, RL = 680 Ω

Internal source resistance, RS = 12 kΩ = 12,000 Ω

Constant current source, IS = 1.2 A

Step 1: Determine the total voltage of the circuit

The total voltage generated by the current source is:

Vtotal = IS × RS = 1.2 A × 12,000 Ω = 14,400 V

Step 2: Calculate the equivalent resistance

The load resistor and internal source resistance form a voltage divider. The voltage across RL is calculated as:

VL = Vtotal × (RL / (RL + RS))

VL = 14,400 × (680 / (680 + 12,000))

VL = 14,400 × (680 / 12,680) = 774 V

Step 3: Find the load current

The load current is:

IL = VL / RL = 774 / 680 = 1.14 A
28
The Thevenin equivalent voltage (VTH) is the short-circuit voltage between two terminals in a circuit.
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Answer: Option B
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29
A 120 V voltage source has a source resistance, RS, of 60 Ω. The equivalent current source is
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Answer: Option A
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30
A 12 mA current source has an internal resistance, RS, of 1.2 kΩ. The equivalent voltage source is
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Answer: Option B
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