Transistors and Applications Questions and Answers

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Q21
Which parameter determines the power handling capacity of a transistor?
  • A Current gain (β)
  • B Maximum collector current
  • C Transition frequency
  • D Input impedance
Answer: Option B
Explanation: Maximum collector current rating directly determines how much power a transistor can handle.
Q22
In a common collector configuration, voltage gain is approximately:
  • A 0.5
  • B 0.95
  • C 10
  • D 100
Answer: Option B
Explanation: Common collector configuration (emitter follower) has voltage gain slightly less than 1, typically 0.95-0.99.
Q23
What is the purpose of heat sink in power transistors?
  • A Increase current gain
  • B Dissipate heat
  • C Provide electrical insulation
  • D Reduce noise
Answer: Option B
Explanation: Heat sinks dissipate heat generated in the transistor, preventing thermal runaway and damage.
Q24
Which type of MOSFET has no channel in zero bias condition?
  • A Depletion MOSFET
  • B Enhancement MOSFET
  • C JFET
  • D Both depletion and enhancement
Answer: Option B
Explanation: Enhancement MOSFETs have no conducting channel when VGS = 0; a channel is induced when gate voltage is applied.
Q25
What is the typical cut-in voltage for germanium transistors?
  • A 0.1V
  • B 0.3V
  • C 0.7V
  • D 1.0V
Answer: Option B
Explanation: Germanium transistors have lower cut-in voltage of about 0.2-0.3V compared to silicon transistors.
Q26
In a transistor amplifier, distortion is primarily caused by:
  • A Non-linear transistor characteristics
  • B Power supply variations
  • C Temperature changes
  • D Load resistance
Answer: Option A
Explanation: Non-linear characteristics of the transistor, especially in the transfer curve, cause harmonic distortion.
Q27
Which transistor configuration is used as impedance matching device?
  • A Common base
  • B Common emitter
  • C Common collector
  • D All configurations
Answer: Option C
Explanation: Common collector configuration (emitter follower) is used for impedance matching due to its high input and low output impedance.
Q28
What is the typical value of early voltage for modern transistors?
  • A 5-10V
  • B 50-200V
  • C 500-1000V
  • D 1000-5000V
Answer: Option B
Explanation: Early voltage for modern transistors typically ranges from 50V to 200V, affecting the output resistance.
Q29
In a differential amplifier, common mode rejection ratio (CMRR) indicates:
  • A Voltage gain
  • B Current gain
  • C Ability to reject common signals
  • D Power handling capacity
Answer: Option C
Explanation: CMRR measures the amplifier's ability to reject signals common to both inputs while amplifying the difference.
Q30
What is the main advantage of cascode amplifier?
  • A High input impedance
  • B High bandwidth
  • C Low power consumption
  • D Better thermal stability
Answer: Option B
Explanation: Cascode configuration provides high bandwidth by reducing the Miller effect capacitance.

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