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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?

3.75 mA
13 mA
3.2 mA
None of these
0.05 mA

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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
None of these
10 k Ohm
20 k Ohm

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Electronic Principles
The merging of a free electron and a hole is called

Recombination
Covalent bonding
Thermal energy
Lifetime
None of these

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Electronic Principles
How much current flows through a 60-W light bulb that is operating at 120 V?

None of these
0.5A
7200 A
180 A
0.083333333333333

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Electronic Principles
Most AC power is obtained from:

None of these
oscillators
lightning
generators
batteries

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

Permeance
Permeability
Reluctance
There is no valid comparison
Retentivity

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