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Electronics and Communication Engineering (ECE) Exam  >  Electronics and Communication Engineering (ECE) Tests  >  Test: Operating Point of Transistor - Electronics and Communication Engineering (ECE) MCQ

Test: Operating Point of Transistor - Electronics and Communication Engineering (ECE) MCQ


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10 Questions MCQ Test - Test: Operating Point of Transistor

Test: Operating Point of Transistor for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Test: Operating Point of Transistor questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: Operating Point of Transistor MCQs are made for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Operating Point of Transistor below.
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Test: Operating Point of Transistor - Question 1
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Reverse saturation current of a common emitter transistor is

Detailed Solution for Test: Operating Point of Transistor - Question 1

Reverse saturation current is the collector current when emitter is open circuited and base-collector junction is reverse bias mode. In this mode of operation collector-base junction act as a reverse biased diode. The current in this reverse biased junction is known as reverse saturation current.

Test: Operating Point of Transistor - Question 2
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Reverse collector saturation current ICBO is

Detailed Solution for Test: Operating Point of Transistor - Question 2

 Reverse collector current ICBO is collector-base current when emitter is open. This is same as reverse saturation current in ideal but have slight difference in practical.

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Test: Operating Point of Transistor - Question 3
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Reverse collector saturation is greater than Reverse saturation current because reverse collector saturation

Detailed Solution for Test: Operating Point of Transistor - Question 3

One of the reasons why reverse collector current exceeds the reverse saturation current is
Introduction of avalanche multiplication current in the base collector junction. This happens when high energy electron collides in the lattice it creates more number of electron and thus a greater current.

Test: Operating Point of Transistor - Question 4
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Reverse collector saturation is greater than Reverse saturation current because reverse collector saturation
Detailed Solution for Test: Operating Point of Transistor - Question 4

One of the reasons why reverse collector current exceeds the reverse saturation current is
Introduction of avalanche multiplication current in the base collector junction. This happens when high energy electron collides in the lattice it creates more number of electron and thus a greater current.
Another reason is leakage current flowing through junction and surface. The ICBO also counts leakage current flowing through junction and surface.

Test: Operating Point of Transistor - Question 5
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Which of the following statement about a common base transistor is true
Detailed Solution for Test: Operating Point of Transistor - Question 5

Common base transistor has very low input resistance (20Ω). It also has very high output resistance. Its current gain is less than unity and it has a medium voltage gain.

Test: Operating Point of Transistor - Question 6
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Which of the following statement about a common emitter transistor is true
Detailed Solution for Test: Operating Point of Transistor - Question 6

Common emitter transistor has high output resistance (about 40k). It has low input resistance (about 1k). Current gain is high (20 to few hundreds). Voltage gain is medium.

Test: Operating Point of Transistor - Question 7
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 Which of the following statement about a common collector transistor is true
Detailed Solution for Test: Operating Point of Transistor - Question 7

 common collector configuration has high input impedance and low output impedance. The current gain is high but voltage gain is low.

Test: Operating Point of Transistor - Question 8
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Which of the following configuration is used as input stage of multistage amplifier
Detailed Solution for Test: Operating Point of Transistor - Question 8

Since input resistance is low and output resistance is high common base configuration is used as input stage of multistage amplifier. Common emitter configuration is used for audio signal amplification. Common collector is used for impedance matching.

Test: Operating Point of Transistor - Question 9
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 Which of the following configuration is used for audio signal amplification
Detailed Solution for Test: Operating Point of Transistor - Question 9

Common base configuration is used as input stage of multistage amplifier. Since voltage gain is high, common emitter configuration is used for audio signal amplification. Common collector is used for impedance matching.

Test: Operating Point of Transistor - Question 10
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Which of the following configuration is used for impedance matching
Detailed Solution for Test: Operating Point of Transistor - Question 10

Common base configuration is used as input stage of multistage amplifier. Common emitter configuration is used for audio signal amplification. Since input impedance is high and output impedance is low, common collector is used for impedance matching.

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