Élément de physique des composants électronique

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Examen S4 (2024-2025)

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The band gap (Eg) of a semiconductor is larger than that of an insulator *

1 point

Falsee

True

The collector current of a transistor in active mode depends on the collector-emitter voltage

1 point

True

False

N-type doping of a semiconductor involves adding:

1 point

Trivalent atoms (e.g., boron).

Pentavalent atoms (e.g., phosphorus).

Free electrons.

Holes.

Clear selection

In forward bias of a PN junction:

1 point

The depletion region widens

The threshold voltage is approximately 0.7 V for silicon.

The current is negligible.

The diode is used for rectification.

Clear selection

What is a semiconductor ? *

1 point

A material that conducts electricity very well.

A material that does not conduct electricity at all.

A material whose conductivity lies between that of a conductor and an insulator.

A material used only in digital circuits.

Autre........

What is the effect of doping on a semiconductor ?

1 point

It decreases its conductivity.

It increases its conductivity.

It does not change its conductivity.

It transforms it into an insulator.

Other:

Clear selection

An intrinsic semiconductor is : *

1 point

A heavily doped semiconductor.

A lightly doped semiconductor.

A moderately doped semiconductor.

Other:

A semiconductor of type N is obtained by doping silicon with: *

1 point

Borum

Indium

Atoms having 3 valence electrons

Other:

What is a transistor ?

1 point

A component that allows the storage of electric charges.

A component that allows amplification or switching of an electrical signal.

A component that converts light energy into electrical energy.

A component that converts electrical energy into mechanical energy.

Other:

Clear selection

What is one of the main advantages of field-effect transistors (FETs) compared to bipolar transistors ?

1 point

They have greater linearity.

They have a higher switching speed.

They have a higher integration density.

They consume less energy.

Other:

What is the main limitation of electronic components in terms of miniaturization ?

1 point

The size of the materials used.

Manufacturing costs.

The laws of quantum physics.

Heat dissipation.

Other:

A p-type semiconductor is obtained by doping silicon with: *

1 point

Atoms with 3 valence electrons.

Atoms with 6 valence electrons.

Phosphorus

Other:

The application of a low-amplitude electric field to a silicon bar causes:

1 point

A diffusion current.

A conduction current.

A diffusion current balanced by a conduction current.

Other:

The saturation current of a PN junction diode is:

1 point

Does not depend on temperature.

Strongly depends on temperature.

Depends little on temperature.

Other:

The term transistor results from the combination of:

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Transfer inductor.

Transfer capacitor.

Transfer resistor.

Other:

A transistor is normally biased if:

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The two junctions are reverse biased.

The two junctions are forward biased.

The BE junction is forward-biased, and the BC junction is reverse-biased.

Other:

The normal reverse regime of a bipolar transistor :
*

1 point

Very important

Of moderate importance

Of no real importance

Other:

What is one of the major challenges for electronic components in terms of switching speed?
*

1 point

Internal resistance.

Parasitic capacitance.

Conductivity.

Avalanche voltage.

Other:

What is doping in the context of semiconductors ?
*

1 point

The intentional addition of impurities to modify the electrical properties of a material.

The process of cooling the material after it has been used.

The process of manufacturing transistors.

Increasing the conductivity of an insulating material.

Other:

What is one of the main challenges for semiconductors in terms of heat dissipation?
*

1 point

The thermal conductivity of the material.

Ambient temperature.

Internal resistance.

Electrical current.

Other:

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