Transistors Questions with Answers | Page 2

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.

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Q11

In a common base configuration, current gain (α) is typically:

A Less than 1
B Greater than 1
C Equal to 1
D Zero

Answer: Option A

Explanation: α is always less than 1 but close to 1, typically around 0.95 to 0.995 for good transistors.

Q12

What is the main application of a Darlington pair?

A High current gain
B High voltage gain
C Low input impedance
D High frequency operation

Answer: Option A

Explanation: Darlington pairs provide very high current gain, typically in thousands, making them suitable for high-gain applications.

Q13

Which biasing method provides best stability against temperature variations?

A Fixed bias
B Collector feedback bias
C Voltage divider bias
D Emitter bias

Answer: Option C

Explanation: Voltage divider bias provides excellent stability because it's less dependent on transistor parameters.

Q14

What is the typical input impedance of a common emitter amplifier?

A 100-500 Ω
B 1-5 kΩ
C 10-50 kΩ
D 100-500 kΩ

Answer: Option B

Explanation: Common emitter amplifiers have moderate input impedance, typically in the range of 1kΩ to 5kΩ.

Q15

In a JFET, pinch-off voltage refers to:

A Gate voltage for zero drain current
B Drain voltage for maximum current
C Gate voltage for maximum transconductance
D Drain voltage for breakdown

Answer: Option A

Explanation: Pinch-off voltage is the gate-source voltage that completely depletes the channel of charge carriers.

Q16

What is the primary function of a transistor in switching applications?

A Amplify signals
B Regulate voltage
C Act as electronic switch
D Generate oscillations

Answer: Option C

Explanation: In switching applications, transistors operate in cutoff and saturation regions to act as electronic switches.

Q17

Which transistor configuration has the highest output impedance?

A Common base
B Common emitter
C Common collector
D All have same output impedance

Answer: Option A

Explanation: Common base configuration has the highest output impedance among the three basic configurations.

Q18

What is the typical value of thermal resistance for power transistors?

A 0.1-1°C/W
B 1-10°C/W
C 10-100°C/W
D 100-1000°C/W

Answer: Option B

Explanation: Thermal resistance for power transistors typically ranges from 1-10°C/W, depending on the package and heat sinking.

Q19

In a MOSFET, the gate is insulated by:

A Silicon dioxide
B Silicon nitride
C Aluminum oxide
D Poly silicon

Answer: Option A

Explanation: MOSFET gates are insulated by a thin layer of silicon dioxide (SiO₂) which provides very high input impedance.

Q20

What is the main advantage of push-pull amplifier configuration?

A Higher voltage gain
B Lower distortion
C Higher input impedance
D Better frequency response

Answer: Option B

Explanation: Push-pull amplifiers reduce even harmonic distortion and improve efficiency compared to single-ended amplifiers.

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