Created it, 06/02/22

Last update it, 06/02/22

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Test 1   Test 2   Test 3   Test 4   Test 5   Test 6

Haut de page Test N° 1

1 - What means doping of a semiconductor ?

2 - Which are the atoms donors and those also called receivers? Why ?

3 - Which difference does there exist between a semiconductor of the type N and a semiconductor of the type P ?

4 - How is the Hall effect characterized ?

5 - How is the mobility of a load expressed ?

Haut de page Test N° 2

1 - How a junction P.N. is formed ?

2 - Which is the tension of threshold (value of the barrier of potential) for a junction with germanium and another with silicon ?

3 - What represents the characteristic tension-current of a diode ?

4 - What a zener diode ?

5 - Under which conditions a diode with junction can behave like a condenser and why ?

Haut de page Test N° 3

1 - How is a transistor formed ?

2 - How do the junctions of a transistor have to be polarized ?

3 - On what does depend the response on a transistor to the high frequencies ?

4 - What the drift transistor effect ?

5 - By which expression is given the coefficient of performance while running b ?

6 - Which are the advantages and the disadvantage of the transmitting assembly common compared to the assembly bases common ?

7 - In what does differ the graphic symbol from a transistor PNP of that of a transistor NPN ?

Haut de page Test N° 4

1 - What is the point of operation of a transistor called ?

2 - How does one calculate the power dissipated by a transistor ?

3 - What does one call thermal resistance of a transistor ?

4 - How does the maximum power vary which the transistor according to the ambient temperature can dissipate ?

5 - How does current ICBO of a transistor to germanium vary when the temperature increases ?

6 - In which circuit, the collector current IC it is most strongly influenced by the temperature ?

7 - Which effect produces an increase in the temperature on the network of characteristics of exit of the transistor ?

8 - How does one define the factor of stability S ?

9 - Why is it necessary to stabilize while running the point of operation of the transistor ?

10 - Refer to the various most current methods of stabilization.

Haut de page Test N° 5

1 - Which is the difference between resistances of entry uninterrupted and into alternate ?

2 - What represents the hybrid parameters ?

3 - In which measuring unit the hybrid parameters are expressed ?

4 - On what do depend primarily the hybrid parameters on a transistor ?

5 - Which are the two advantages of the parameters r ?

6 - Which are the parameters necessary to define the behavior of a transistor in high frequencies ?

Haut de page Test N° 6

1 - Which is the essential difference between a Thyristor and Triac ?

2 - Which is the action of the Trigger on a Thyristor ?

3 - What means the terms “Tension of reversal” ?

4 - Which is the preferential direction of release of Triac (polarity of A2 and VG) ?

5 - Which is the influence of the tension on a DIAC ?

6 - What a diode SHOCKLEY ?

7 - What a QUADRAC ?

8 - Which is the difference between a SWITCH SUS and a SWITCH SBS ?

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Daniel