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
1. What is the most common application of a bipolar junction transistor (BJT)?
- Amplification
- Rectification
- Oscillation
- Modulation
2. In a common emitter configuration, the input signal is applied between:
- Base and emitter
- Base and collector
- Emitter and collector
- Collector and ground
3. What is the typical value of current gain (β) for a small signal transistor?
- 20-50
- 50-300
- 300-500
- 500-1000
4. Which transistor configuration provides both voltage and current gain?
- Common base
- Common emitter
- Common collector
- All configurations
5. What is the main advantage of FET over BJT?
- High input impedance
- High current gain
- Low noise
- Better linearity
6. In a transistor, the region between base and collector is called:
- Base-emitter junction
- Base-collector junction
- Emitter-collector junction
- Depletion region
7. What is the purpose of emitter bypass capacitor in CE amplifier?
- Increase voltage gain
- Reduce distortion
- Improve frequency response
- Provide DC bias
8. Which transistor parameter indicates its high-frequency capability?
- Transition frequency (fT)
- Current gain (β)
- Early voltage
- Saturation voltage
9. What is the typical value of VBE for silicon transistor in active region?
- 0.2V
- 0.7V
- 1.2V
- 2.0V
10. Which type of transistor is known as unipolar transistor?
- BJT
- JFET
- UJT
- Phototransistor