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Electronic Principles

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

6
85
None of these
9
81

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Electronic Principles
What is the inductive reactance of a 2-H coil operating at 60 Hz?

60 Ohm
30 Ohm
None of these
120 Ohm
754 Ohm

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Electronic Principles
What is the barrier potential of a silicon diode at room temperature?

1 V
0.3V
2 m V per degree Celsius
None of these
0.7V

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

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

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Electronic Principles
The direction of electron current flow is:

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

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Electronic Principles
A device that converts mechanical pressure to electrical energy is called a:

nicad cell
solar cell
photodiode
None of these
piezoelectric device

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