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Electronic Principles

Electronic Principles
Positive ions are atoms that have

Lost a proton
Gained an electron
None of these
Gained a proton
Lost an electron

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Electronic Principles
The transistor has a collector current of 10 mA and a base current of 40 mA. What is the current gain of the transistor?

250 µA
350 µA
300 µA
0.25 µA
None of these

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

3.75 mA
13 mA
None of these
0.05 mA
3.2 mA

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Electronic Principles
Determine the resistance value and tolerance of a resistor that has the following color bands; first band is red, second band is red, third band is orange, and the fourth band is gold

None of these
220 Ohm, 10%
22, 000 Ohm, 10%
220 Ohm, 5%
22,000 Ohm, 5%

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Electronic Principles
A certain power transformer has a turns ratio of 5. What voltage can you expect at the secondary winding when you apply 120 V to the primary winding?

24 V
0.4 V
600 V
4.73
None of these

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Electronic Principles
A device that converts light energy to electrical energy is called a:

solar cell
photo transistor
photodiode
None of these
thermocouple

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