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Electronic Principles

Electronic Principles
A transistor has a current gain of 125 and a base current of 30 µA. What is the collector current?

0.05 mA
3.75 mA
None of these
13 mA
3.2 mA

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Electronic Principles
A real voltage source has

Zero internal resistance
A large internal resistance
None of these
A small internal resistance
Infinite internal resistance

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Electronic Principles
How many types of flow are there in a semiconductor?

None of these
1
3
2

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Electronic Principles
The nucleus of the copper atom contains how many protons?

1
29
4
None of these
18

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Electronic Principles
An audio transformer has a turn ratio of 9, What is its impedance ratio?

81
85
None of these
6
9

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Electronic Principles
Which one of the following properties of a magnetic circuit can be directly compared to current in an electrical circuit?

None of these
Flux density
Number of lines of force
Reluctance
Magnetomotive force

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