30 MCQs on Ideal Voltage and Current Sources | Electric Circuits

Welcome to 30 MCQs on Ideal Voltage and Current Sources under the chapter of Electric Circuits for Electrical Engineering. These 30 MCQs will test your knowledge on Ideal Voltage and Current Sources. Each question covers different parts of power systems. Use these questions to prepare for exams.

1. What is the internal resistance of an ideal voltage source?

A. Zero B. Infinite C. One ohm D. Variable

2. The internal resistance of an ideal current source is:

A. Zero B. Infinite C. One ohm D. Variable

3. When connecting two ideal voltage sources in parallel, what is required?

A. They can have different voltages B. They must have identical voltages C. Their sum should be zero D. Their difference should be zero

4. What happens when an ideal voltage source is short-circuited?

A. Source gets damaged B. Voltage becomes zero C. Infinite current flows D. Current becomes zero

5. What happens when an ideal current source is open-circuited?

A. Current becomes zero B. Source gets damaged C. Current remains constant D. Infinite voltage appears

6. The voltage across an ideal current source is:

A. Always zero B. Dependent on circuit conditions C. Always infinite D. Equal to source current

7. Two ideal current sources in parallel will:

A. Not work B. Add their currents C. Subtract their currents D. Multiply their currents

8. The power delivered by an ideal voltage source is:

A. Always zero B. Equal to VI C. Equal to I²R D. Equal to V²/R

9. Norton’s equivalent circuit consists of:

A. Current source in parallel with resistance B. Voltage source in series with resistance C. Current source in series with resistance D. Voltage source in parallel with resistance

10. Thevenin’s equivalent circuit consists of:

A. Current source in parallel with resistance B. Voltage source in series with resistance C. Current source in series with resistance D. Voltage source in parallel with resistance

11. An ideal voltage source with zero internal resistance is connected across a 10Ω resistor. If the source voltage is 10V, the current through the resistor is:

A. 1A B. 10A C. 0.1A D. 100A

12. The terminal voltage of an ideal voltage source:

A. Depends on load current B. Varies with temperature C. Remains constant regardless of load D. Increases with load

13. What is the current through an ideal current source when connected to a short circuit?

A. Zero B. Infinite C. Equal to source current D. Half of source current

14. Two 5V ideal voltage sources connected in series will provide:

A. 10V B. 5V C. 2.5V D. 0V

15. When converting a voltage source to current source, the value of parallel resistance is:

A. Zero B. Equal to series resistance of voltage source C. Infinite D. Half of series resistance

16. The output impedance of an ideal voltage source is:

A. Very high B. Zero C. Infinite D. Unity

17. In a practical voltage source, as the load current increases:

A. Terminal voltage increases B. Terminal voltage remains constant C. Terminal voltage decreases D. Current becomes zero

18. The current through an ideal voltage source is determined by:

A. External circuit B. Source voltage C. Internal resistance D. Temperature

19. When converting a current source to voltage source, the value of series resistance is:

A. Zero B. Equal to parallel resistance of current source C. Infinite D. Half of parallel resistance

20. What happens to the current in an ideal current source if the load resistance is doubled?

A. Doubles B. Halves C. Becomes zero D. Remains constant

21. The voltage across the terminals of an ideal current source is:

A. Always zero B. Determined by the load C. Equal to source current D. Constant

22. Two 2A ideal current sources in series will provide:

A. 4A B. 2A C. 1A D. 0A

23. The power dissipated in the internal resistance of an ideal voltage source is:

A. Maximum B. Variable C. Zero D. Infinite

24. The output impedance of an ideal current source is:

A. Zero B. Very low C. Infinite D. Unity

25. In source transformation, if voltage source V is converted to current source I, then:

A. I = V×R B. I = V/R C. I = V²/R D. I = √(V/R)

26. An ideal voltage source can be used to:

A. Measure current only B. Maintain constant voltage C. Measure resistance only D. Maintain constant current

27. When two ideal voltage sources of different voltages are connected in parallel:

A. Lower voltage source will work B. Higher voltage source will work C. It violates Kirchhoff’s voltage law D. They will share the load equally

28. The Norton equivalent of an open circuit is:

A. Zero current source B. Infinite current source C. Current source with zero current D. Current source with infinite resistance

29. For an ideal voltage source, the V-I characteristic is:

A. A vertical line B. A horizontal line C. A sloped line D. A curved line

30. For an ideal current source, the V-I characteristic is:

A. A vertical line B. A sloped line C. A curved line D. A horizontal line

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