Voltage Regulators Questions and Answers
Voltage Regulators questions with answers cover one of the most critical topics in electronics engineering — maintaining constant output voltage. These questions are highly relevant for electronics interview questions and answers, GATE preparation, and PSU exams like BHEL, DRDO, and ISRO. Understanding voltage regulators helps you analyze how electronic circuits stabilize voltage under varying load conditions. Through detailed MCQs and solutions, students can master linear, switching, and integrated voltage regulators efficiently. Practice these electronics-based aptitude tests to improve conceptual clarity and readiness for both academic and placement assessments.
Voltage Regulators
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49 questions
21. In a simple series regulator circuit, which of the following components is the controlling element?
- Load resistor
- Zener diode
- Transistor Q1
- None of the above
22. In an improved shunt regulator, which of the following components sets the reference voltage?
- Transistor Q1
- Zener diode
- Transistor Q2
- RS
23. ________ regulation can be defined as the percentage change in the output voltage for a given change in load current.
- Line
- Load
24. How many diodes conduct in the full-wave bridge rectifier while the capacitor is being charged?
- 1
- 2
- 3
- 4
25. How many terminals does a 7800 series IC regulator have?
- 2
- 3
- 4
- none of the above
26. What are the typical values of Vref and Iadj for the LM317 adjustable voltage regulator?
- 1.0 V, 100 mA
- 1.5 V, 100 mA
- 1.25 V, 100 µA
- 1.25 V, 10 mA
27. Which component(s) set(s) the voltage across the load in a basic transistor shunt regulator?
- Zener diode
- Transistor base-emitter voltage
- Both the Zener diode and the transistor base-emitter voltage
- None of the above
28. Voltage regulation requires
- only line regulation.
- only load regulation.
- a constant load.
- load and line regulation.
29. Across which of the following components of a power supply does the average (dc) voltage exist?
- Diodes
- Secondary of the transformer
- Capacitor filter
- None of the above
30. Switching regulators are more efficient than linear regulators and are particularly useful in ________-voltage, ________-current applications.
- high, high
- low, high
- high, low