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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?

3.2 mA
None of these
0.05 mA
13 mA
3.75 mA

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Electronic Principles
How much current flows through a 0.02-H choke that is operating from a 12-V ac, 100-Hz source?

0.955 A
None of these
0.02 A
0.41666666666667
2.02 A

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

photodiode
None of these
nicad cell
solar cell
piezoelectric device

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Electronic Principles
Suppose a voltage source has an ideal voltage of 12V and an internal resistance of 0.5W. For what values of load resistance will the voltage source appear stiff?

6 Ohm
50 Ohm or more
5 Ohm
None of these
100 Ohm

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Electronic Principles
A loadstone is:

a paramagnetic alloy
None of these
an artificial magnet
a temporary magnet
a natural magnet

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Electronic Principles
The rise time of a pulse waveform is the time required for the voltage to rise:

None of these
from zero to its peak value
from zero to its rms value
from 10% of the peak value to 90% of the peak value
from 10% of the peak value to 70.7% of the peak value

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