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Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Test  >  Test: Band Structure of an Open-Circuited PN Junction - Electrical Engineering (EE) MCQ

Band Structure of an Open-Circuited PN Junction - Free MCQ Practice Test


MCQ Practice Test & Solutions: Test: Band Structure of an Open-Circuited PN Junction (10 Questions)

You can prepare effectively for Electrical Engineering (EE) with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Band Structure of an Open-Circuited PN Junction". These 10 questions have been designed by the experts with the latest curriculum of Electrical Engineering (EE) 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 10 minutes
  • - Number of Questions: 10

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Test: Band Structure of an Open-Circuited PN Junction - Question 1
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The conduction band edge in the p material is not at the same level to that of conduction band edge in the n material. Is it true or false?

Detailed Solution: Question 1

In a p-n junction diode, the energy levels of the p material and n material will not be at same level. They will be different. So, the conduction band edge as well as the valence band edge of the p material will not be same to that of the n material.

Test: Band Structure of an Open-Circuited PN Junction - Question 2
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Which of the following equations represent the correct expression for the shift in the energy levels for the p-n junction?

Detailed Solution: Question 2

The shift in the energy of the energy level will be the difference of the conduction band edge of the p material and conduction band edge of n material. In the energy level diagram, the conduction band edge of p material is higher than that of the n material.

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Test: Band Structure of an Open-Circuited PN Junction - Question 3
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 Calculate the Eo given that Nd=1.5*1010cm-3, Na=1.5*1010cm-3 at temperature 300K?

Detailed Solution: Question 3

 Eo=kTln((Nd*Na)/(ni)2)
Substituting k=1.38*10-23/K, T=300k and the values ofNd,Naand ni,
We get
Eo=0eV.

Test: Band Structure of an Open-Circuited PN Junction - Question 4
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 In a p-n junction, the valence band edge of the p material is greater than which of the following band?

Detailed Solution: Question 4

When the p-n junction is formed, the energy levels of the p- material go higher than the n material. That’s why the valence band of the p material will be greater than that of the n material.

Test: Band Structure of an Open-Circuited PN Junction - Question 5
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Which of the following equations represent the correct expression for the band diagram of the p-n junction? (E1=difference between the fermi level of material and conduction band of n material and E2=difference between the conduction band of n material and fermi level of n material)

Detailed Solution: Question 5

From the energy band diagram of the p-n junction, the option ‘a’ satisfies that band diagram.

Test: Band Structure of an Open-Circuited PN Junction - Question 6
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Calculate the value of Eo when pno=104cm-3 and ppo=1016cm-3 at T=300K.

Detailed Solution: Question 6

Eo=kTln(ppo/pno)
Substituting the values, we get
Eo=0.7eV.

Test: Band Structure of an Open-Circuited PN Junction - Question 7
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Calculate the value of Dp when µp=400cm/s and VT=25mV.

Detailed Solution: Question 7

Dp= µp*VT
=400*10-2*25*10-3
=0.1.

Test: Band Structure of an Open-Circuited PN Junction - Question 8
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 What is the value of kT at room temperature?

Detailed Solution: Question 8

 kT=1.38*10-23*300K
=4.14*10-21/ (1.6*10-19)
=0.0256eV.

Test: Band Structure of an Open-Circuited PN Junction - Question 9
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 Is Vo depends only on the equilibrium concentrations. Is it true or false?

Detailed Solution: Question 9

Vo is the contact potential of the junction when the junction is in equilibrium. If, the junction is not in the equilibrium, Vo can’t be calculated.

Test: Band Structure of an Open-Circuited PN Junction - Question 10
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Calculate Vo when ppo=1016cm-3, pno=104cm-3 and Vt=25mV.

Detailed Solution: Question 10

 Vo=VT ln⁡(ppo/pno )
=25*10-3*ln(1016/104)
=0.69V.

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About this Electrical Engineering (EE) Practice Test

This test contains 10 MCQs on Band Structure of an Open-Circuited PN Junction with detailed solutions for each question. It is part of the course on EduRev, designed to align with the current Electrical Engineering (EE) syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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