Electronic Devices-Junction Transistor (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 1 - 4 of 11

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Question number: 1

» Electronic Devices » Junction Transistor

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Question

Which of the following are false?

(1) Common base transistor is commonly used because current gain is maximum

(2) Common collector is commonly used because current gain is maximum

(3) Common emitter is the least used transistor

(4) Common emitter is commonly used because current gain is maximum

Select the correct answers and mark it according to the following codes.

Choices

Choice (4) Response

a.

1,2 and 3 are correct

b.

1 and 2 are correct

c.

2 and 4 are correct

d.

1 and 3 are correct

Question number: 2

» Electronic Devices » Junction Transistor

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Question

In an NPN transistor circuit, the collector current is 10 mA. If 90 % of the electrons emitted reach the collector, the emitter current (I E) and base current (I B) are given by

Choices

Choice (4) Response

a.

I E = 9mA, I B =- 1mA

b.

I E = 1mA, I B = 11mA

c.

I E =- 1mA, I B = 9mA

d.

I E = 11mA, I B = 1mA

Question number: 3

» Electronic Devices » Junction Transistor

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Question

If L 1, L 2, L 3 are the lengths of the emitter, base and collector of a transistor then,

Choices

Choice (4) Response

a.

L 1 > L 3 > L 2

b.

L 3 < L 1 < L 2

c.

L 3 < L 2 > L 1

d.

L 1 = L 2 = L 3

Question number: 4

» Electronic Devices » Junction Transistor

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Question

In an NPN transistor 10 10 electrons enter the emitter in 10 -6 s and 2 % electrons recombine with holes in base, then α and β respectively are,

Choices

Choice (4) Response

a.

α = 0.49, β = 98

b.

α = 49, β = 0.98

c.

α = 0.98, β = 49

d.

α = 98, β = 0.49

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