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Electronic Principles

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

None of these
1
3
2

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Electronic Principles
When the collector current increases, what does the current gain do?

None of these
any of the above
decreases
increases
stays the same

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Electronic Principles
A step-down transformer has turns ration of 5:1. If the primary voltage is 120 Vrms, what is the secondary voltage?

24 V
18 V
None of these
12 V
30 V

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Electronic Principles
Household light bulbs have a given power rating, and they operate at 120 V. Which one of the following equations most directly provides the current rating of these light bulbs?

None of these
P = IE
P = E2/R
I = P/E
P = I2R

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

1
29
None of these
4
18

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Electronic Principles
Doubling the number of turns of wire in an inductor:

multiplies the value of inductance by two
multiplies the value of inductance by four
None of these
reduces the value of inductance by one-half
reduces the value of inductance by one-fourth

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