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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
13 mA
3.2 mA
3.75 mA
None of these

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Electronic Principles
A resistor has a rated value of 100 ohm and a tolerance of 10%. What is its minimum and maximum allowable resistance value?

90 Ohm - 110 ohm
None of these
99 Ohm - 102 ohm
98 Ohm - 100.1 ohm
90 Ohm - 101 ohm

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Electronic Principles
Doubling the operating frequency of a purely capacitive circuit:

doubles the amount of total current
thrice the amount of total current
None of these
has no effect on the total circuit current
cuts the total current by one-half

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Electronic Principles
What is one important thing transistors do?

None of these
Amplify weak signals
Emit light
Rectify line voltage
Regulate voltage

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Electronic Principles
How may valence electrons does a silicon atom have?

4
None of these
2
1

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Electronic Principles
A current source has an internal resistance of 100 kW. What is the largest load resistance if the current source must appear stiff?

2 k Ohm
1 k Ohm
20 k Ohm
None of these
10 k Ohm

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