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Electronic Principles

Electronic Principles
Which is the most widely used semiconductor?

Germanium
None of these
All of these
Copper
Silicon

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Electronic Principles
The merging of a free electron and a hole is called

Recombination
None of these
Covalent bonding
Thermal energy
Lifetime

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

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

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Electronic Principles
An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?

Free electrons
Thermal energy
Valence electrons
Doping
None of these

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Electronic Principles
Two diodes are in series. The first diode has a voltage of 0.75 V and the second has a voltage of 0.8 V. If the current through the first diode is 500 mA, what is the current through the second diode

None of these
12 mA
10 mA
11 mA
14 mA

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Electronic Principles
At room temperature an intrinsic silicon crystal acts approximately like

a battery
an insulator
a conductor
a piece of copper wire
None of these

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