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Electronic Principles

Electronic Principles
The rotating coil of wire in an electric motor is called the:

None of these
armature
loop
brush
commutator

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Electronic Principles
When the Q point moves along the load line, the voltage increases when the current

Stays the same
Can be any of above
Increases
Decreases
None of these

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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?

2.02 A
0.41666666666667
0.02 A
0.955 A
None of these

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

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Electronic Principles
The direction of electron current flow is:

from neutral to positive
None of these
from right to left
from negative to positive
from positive to negative

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

85
9
6
81
None of these

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