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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
85
6
81

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Electronic Principles
Current and voltage are said to be in phase when:

their waveforms are both ac or both dc
they have the same amplitude and frequency
None of these
All of these
their waveforms cross through zero and reach positive and negative peaks at the same time

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Electronic Principles
What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with an inductor that has a reactance of 200 W?

88.8 ohm
224 ohm
None of these
89.3 ohm
77.7 ohm

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Electronic Principles
The number of free electrons and holes in intrinsic semiconductor increases when the temperature

Increases
0oC
Decreases
Stays the same
None of these

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Electronic Principles
As the temperature increases, the current gain

decreases
increases
None of these
can be any of the above
contant

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Electronic Principles
The direction of electron current flow is:

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

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