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Test: Quantitative Theory of The PN Diode Currents


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10 Questions MCQ Test Analog Electronics | Test: Quantitative Theory of The PN Diode Currents

Test: Quantitative Theory of The PN Diode Currents for Electrical Engineering (EE) 2023 is part of Analog Electronics preparation. The Test: Quantitative Theory of The PN Diode Currents questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Quantitative Theory of The PN Diode Currents MCQs are made for Electrical Engineering (EE) 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Quantitative Theory of The PN Diode Currents below.
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Test: Quantitative Theory of The PN Diode Currents - Question 1

What is the thickness of ‘space charge region’ or ‘transition region’ in P-N junction diode?

Detailed Solution for Test: Quantitative Theory of The PN Diode Currents - Question 1

The region of the junction is depleted by mobile charges, hence it is called space charge region or depletion region or transition region which is 10-4 cm = 10-6 m= 1 micron.

Test: Quantitative Theory of The PN Diode Currents - Question 2

If what of the following is doped into a semiconductor say germanium a P-N junction is formed.

Detailed Solution for Test: Quantitative Theory of The PN Diode Currents - Question 2

 A P-N junction is formed only when a donor impurities and acceptor impurities are added to either side of a semiconductor like silicon and germanium.

Test: Quantitative Theory of The PN Diode Currents - Question 3

 Which of the factors doesn’t change the diode current.

Detailed Solution for Test: Quantitative Theory of The PN Diode Currents - Question 3

 I = Io [e(v/nVt) -1], as shown in this equation the diode current is dependent on temperature , voltage applied on the diode , Boltzmann’s constant but diode current is not dependent on resistance as it is independent of resistance.

Test: Quantitative Theory of The PN Diode Currents - Question 4

The product of mobility of the charge carriers and applied Electric field intensity is known as

Detailed Solution for Test: Quantitative Theory of The PN Diode Currents - Question 4

 When the semiconductors like silicon and germanium is implied by an electric field the charge carriers when get drifted by certain velocity known as drift velocity. Drift velocity is product of mobility of charge carriers and field intensity.

Test: Quantitative Theory of The PN Diode Currents - Question 5

The tendency of charge carriers to move from a region of heavily concentrated charges to region of less concentrated charge is known as.

Detailed Solution for Test: Quantitative Theory of The PN Diode Currents - Question 5

In a semiconductor the charge will always have a tendency to move from higher concentrated area to less concentrated area to maintain equilibrium this movement of charges will result in diffusion current.

Test: Quantitative Theory of The PN Diode Currents - Question 6

If the drift current is 100mA and diffusion current is 1A what is the total current in the semiconductor diode.

Detailed Solution for Test: Quantitative Theory of The PN Diode Currents - Question 6

We know that the total current in a semiconductor is equal to sum of both drift current and diffusion current. Total current = 1A + 100mA =1.1A.

Test: Quantitative Theory of The PN Diode Currents - Question 7

Which of the following is reverse biased?

Detailed Solution for Test: Quantitative Theory of The PN Diode Currents - Question 7

The P-N junction diode is forward bias when the voltage applied to p type is greater than the n type and vice versa, since the voltage applied to p type is less in C) it is the answer.

Test: Quantitative Theory of The PN Diode Currents - Question 8

The drift velocity is 5V and the applied electric field intensity 20v/m what will be the mobility of charge carriers.

Detailed Solution for Test: Quantitative Theory of The PN Diode Currents - Question 8

We know that mobility of charge carriers is drift velocity divide by applied electric field intensity. Mobility = drift velocity / field intensity.

Test: Quantitative Theory of The PN Diode Currents - Question 9

 When there is an open circuit what will be the net hole current.

Detailed Solution for Test: Quantitative Theory of The PN Diode Currents - Question 9

 If there is any current present under open circuit there will be an indefinite growth of holes at one end of the semiconductor which is practically not possible hence zero amperes.

Test: Quantitative Theory of The PN Diode Currents - Question 10

Rate of change of concentration per unit length in a semiconductor is called as.

Detailed Solution for Test: Quantitative Theory of The PN Diode Currents - Question 10

 In a semiconductor the holes as well as electrons which are the charge carriers is not equally concentrated on all regions of the semiconductor the change in their rate is referred as concentration gradient.

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