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Electronic Principles

Electronic Principles
An audio transformer has a turn ratio of 9, What is its impedance ratio?

None of these
9
6
81
85

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

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

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

Magnetomotive force
None of these
Flux density
Reluctance
Number of lines of force

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

None of these
18
1
4
29

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Electronic Principles
What kind of battery is most likely included in a cordless electric knife?

Lead-acid battery
Mercury-cell battery
None of these
Zinc-carbon battery
Nicad battery

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Electronic Principles
If a transistor operates at the middle of the load line, an increase in the current gain will move the Q point

up
nowhere
None of these
down
off the load line

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