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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?

13 mA
3.75 mA
0.05 mA
3.2 mA
None of these

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Electronic Principles
The Thevenin resistance is equal in value to the

Open-load resistance
None of these
Half the load resistance
Load resistance
Internal resistance of a Morton circuit

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Electronic Principles
At room temperature a conductor has low many holes?

Only those produced by thermal energy
None of these
many
less than the free electrons
Same number as free electrons

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Electronic Principles
In a transistor operates at the middle of the load line, an increase in the base resistance will move the Q point

None of these
off the load line
up
nowhere
down

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Electronic Principles
If a load resistance is 1 kW, a stiff current source has a resistance of

At least 10 Ohm
Less than 10 Ohm
None of these
More than 100 k Ohm
Less than 100 k Ohm

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Electronic Principles
Current and voltage are said to be in phase when:

None of these
All of these
their waveforms are both ac or both dc
their waveforms cross through zero and reach positive and negative peaks at the same time
they have the same amplitude and frequency

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