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Electronic Principles

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

Increases
Stays the same
0oC
None of these
Decreases

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Electronic Principles
The current gain of a transistor is defined as the ratio of the collector current to the

emitter current
None of these
supply current
collector current
base current

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Electronic Principles
A loadstone is:

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

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Electronic Principles
What is the turns ratio for the transformer specified in the above question?

None of these
0.575
10.738
0.707
1.5

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Electronic Principles
The direction of conventional current flow is:

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

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Electronic Principles
The primary impedance of a transformer is 60 ohm and the secondary impedance is 120 ohm. What is the impedance ratio?

0.25
None of these
180
0.5
4

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