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
41. In a JFET, the relationship between ID and VGS is:
- Linear
- Square law
- Exponential
- Logarithmic
42. What is the main disadvantage of class C amplifiers?
- Low efficiency
- High distortion
- Complex circuitry
- High power consumption
43. Which transistor configuration has 180° phase shift between input and output?
- Common base
- Common emitter
- Common collector
- All configurations
44. In a power amplifier, thermal runaway is prevented by:
- Heat sink
- Emitter resistor
- Base resistor
- Collector resistor
45. What is the typical value of base spreading resistance in transistors?
- 1-10 Ω
- 10-500 Ω
- 1-5 kΩ
- 10-50 kΩ
46. Which type of coupling provides best low-frequency response?
- RC coupling
- Transformer coupling
- Direct coupling
- Impedance coupling
47. In a transistor, the parameter hfe represents:
- Voltage gain
- Current gain
- Input impedance
- Output impedance
48. What is the typical value of output impedance for common emitter amplifier?
- 100-500 Ω
- 1-5 kΩ
- 10-50 kΩ
- 100-500 kΩ
49. Which type of oscillator uses crystal for frequency stability?
- Hartley oscillator
- Colpitts oscillator
- Crystal oscillator
- RC phase shift oscillator
50. In a transistor switch, storage time is caused by:
- Junction capacitance
- Minority carrier storage
- Base resistance
- Collector capacitance