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Electronic Principles

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

9
81
6
85
None of these

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Electronic Principles
The basic unit of measurement for current is the:

watt
volt
ampere
None of these
ohm

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

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

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Electronic Principles
Which one of the following kinds of materials has the highest permeability?

A paramagnetic material
A ferromagnetic material
None of these
All of these
A diamagnetic material

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Electronic Principles
An unloaded zener regulator has a source voltage of 20 V, a series resistance of 330 W, and a zener voltage of 12 V, What is the Zener current?

68.4 mA
None of these
28.4 mA
34.4 mA
24.2 mA

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

0.995 mA
None of these
2.02 A
0.151 mA
157 raA

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