HARD
12th West Bengal Board
IMPORTANT
Earn 100

If the emitter and base of a n-p-n transistor have same doping concentration, explain how will the base and collector current be effected ? 

Important Questions on Electronic Devices

HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 52
A transistor is being used as common amplifier. What is the value of phase-difference, if any, between the emitter collector voltage and the input voltage ?
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 1
What are energy bands in a solid? How band theory can explain the differences between conductors, insulators, and semiconductors?
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 2
Explain how electrical conductivity of a semiconducting material may be increased by doping. Draw the band structures of an n -type and p -type semiconductor.
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 3

Derive an expression for electrical conductivity of semiconductor ?

HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 4
What is pn -junction diode? Draw the characteristic curve of a pn -junction diode in the forward and reverse bias.
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 5

Describe with a circuit diagram how ac voltage is rectified with the help of a diode.

HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 6
 What is the effect of doping on the depletion layer of a pn -junction?
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 21 - Electronic Devices>EXERCISE 21>Q 6
Why silicon diode is better compared to a germanium diode in a rectifier ?