Transistors and Applications Questions and Answers
Transistors are semiconductor devices that amplify and switch electronic signals, forming the foundation of most circuits. They are a frequent topic in aptitude questions and answers for GATE, ISRO, and core electronics placement exams. Understanding NPN and PNP transistor configurations, biasing, and current amplification helps analyze circuit behavior effectively. By practicing transistor aptitude questions with solutions PDF, aspirants can improve their conceptual clarity and application skills, which are crucial for clearing electronics-based technical exams and interviews.
Transistors and Applications
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50 questions
11. In a common base configuration, current gain (α) is typically:
- Less than 1
- Greater than 1
- Equal to 1
- Zero
12. What is the main application of a Darlington pair?
- High current gain
- High voltage gain
- Low input impedance
- High frequency operation
13. Which biasing method provides best stability against temperature variations?
- Fixed bias
- Collector feedback bias
- Voltage divider bias
- Emitter bias
14. What is the typical input impedance of a common emitter amplifier?
- 100-500 Ω
- 1-5 kΩ
- 10-50 kΩ
- 100-500 kΩ
15. In a JFET, pinch-off voltage refers to:
- Gate voltage for zero drain current
- Drain voltage for maximum current
- Gate voltage for maximum transconductance
- Drain voltage for breakdown
16. What is the primary function of a transistor in switching applications?
- Amplify signals
- Regulate voltage
- Act as electronic switch
- Generate oscillations
17. Which transistor configuration has the highest output impedance?
- Common base
- Common emitter
- Common collector
- All have same output impedance
18. What is the typical value of thermal resistance for power transistors?
- 0.1-1°C/W
- 1-10°C/W
- 10-100°C/W
- 100-1000°C/W
19. In a MOSFET, the gate is insulated by:
- Silicon dioxide
- Silicon nitride
- Aluminum oxide
- Poly silicon
20. What is the main advantage of push-pull amplifier configuration?
- Higher voltage gain
- Lower distortion
- Higher input impedance
- Better frequency response