Tranzistorul bipolar - grila

Figura 1 prezinta simbolul unui

Figura 1

a)       si

b)       v_BE=V_BEsat si v_CE=V_CEsat

c)       v_BE=const. si i_C=i_E

d)       v_BE=V_BEsat si v_CE= const

Modelul matematic aproximativ al unui unui tranzistor bipolar npn care lucreaza in regim activ normal este:

a)       si

b)       v_BE=V_BEsat si v_CE=V_CEsat

c)       v_BE=const. si i_C i_E

d)       v_BE=V_BEsat si v_CE= const

Modelul matematic aproximativ al unui unui tranzistor bipolar npn care lucreaza in regim de blocare este:

a)       si

b)       v_BE=V_BEsat si v_CE=V_CEsat

c)       v_BE=const. si i_C=i_E

d)       v_BE=V_BEsat si v_CE= const

Modelul matematic aproximativ al unui unui tranzistor bipolar npn care lucreaza in regim activ normal este:

a)       si

b)       v_BE=V_BEsat si v_CE=V_CEsat

c)       v_BE=const. si

d)       v_BE=V_BEsat si v_CE= const

Modelul matematic aproximativ al unui unui tranzistor bipolar npn care lucreaza in regim activ normal este:

a)       si

b)       v_BE=V_BEsat     si v_CE=V_CEsat

c)       . si

d)       v_BE=V_BEsat     si v_CE= const

Figura 8 prezinta una dintre schemele echivalente ale unui tranzistor bipolar npn

Figura 8

a)       comandat in curent care lucreaza in regim cvasistatic de semnal mare;

b)       comandat in tensiune care lucreaza in regim cvasistatic de semnal mare;

c)       comandat in curent care lucreaza in regim cvasistatic de semnal mic;

d)       comandat in tensiune care lucreaza in regim cvasistatic de semnal mic.

Figura de mai jos reprezinta una dintre schemele echivalente ale unui tranzistor bipolar npn

Figura 9

a)       comandat in curent care lucreaza in regim cvasistatic de semnal mare;

b)       comandat in tensiune care lucreaza in regim cvasistatic de semnal mare;

c)       comandat in curent care lucreaza in regim cvasistatic de semnal mic;

d)       comandat in tensiune care lucreaza in regim cvasistatic de semnal mic.

Cum variaza v_BE cu cresterea temperaturii (in domeniul normal de variatie al temperaturii ambiante)?

a)       aproximativ - 20 mV/^oC;

b)       aproximativ - 2 mV/^oC;

c)       aproximativ - 200 V/^oC;

d)       aproximativ - 20 V/^oC.

Figura 10 prezinta una dintre schemele echivalente ale unui tranzistor bipolar npn

Figura 10

a)       comandat in curent care lucreaza in regim cvasistatic de semnal mare;

b)       comandat in tensiune care lucreaza in regim cvasistatic de semnal mare;

c)       comandat in curent care lucreaza in regim cvasistatic de semnal mic;

d)       comandat in tensiune care lucreaza in regim cvasistatic de semnal mic.

Figura 11 prezinta una dintre schemele echivalente ale unui tranzistor bipolar npn

Figura 11

a)       comandat in curent care lucreaza in regim cvasistatic de semnal mare;

b)       comandat in tensiune care lucreaza in regim cvasistatic de semnal mare;

c)       comandat in curent care lucreaza in regim cvasistatic de semnal mic;

d)       comandat in tensiune care lucreaza in regim cvasistatic de semnal mic.

This problem treats the problem of the operating modes. For the circuit presented in figure 12, determine the operating mode for the transistor. Assume that the resistor has usual values.

Figure 12

a)       cut-off region

b)       saturation region

c)       active region

d)       reverse active region

This problem treats the problem of the operating modes. For the circuit presented in figure 13, determine the operating mode for the transistor. Assume that the resistors have usual values.

Figure 13

a)      

a)       cut-off region

b)       saturation region

c)       active region

d)       reverse active region

This problem treats the problem of the operating modes. For the circuit presented in figure 14, determine the operating mode for the transistor. Assume that the resistor has usual values

Figure 14

a)      

a)       cut-off region

b)       saturation region

c)       active region

d)       reverse active region

This problem treats the problem of the operating modes. For the circuit presented in figure 15, determine the operating mode for the transistors. Assume that the resistors have usual values.

Figure 15

a)      

a)       cut-off region

b)       saturation region

c)       active region

d)       reverse active region

This problem treats the problem of the operating modes. For the circuit presented in figure 16, determine the operating mode for the transistors. Assume that the resistors have usual values.

Figure 16

a)      

a)       cut-off region

b)       saturation region

c)       active region

d)       reverse active region

This problem treats the problem of quiescent point. For the circuit presented in figure17, determine the quiescent point (I_C and V_CE). Assume that     and V_BE=0.7V for the transistor. One considers that the current is measured in mA, the voltage in V and the resistance in K.

Figure 17

a)      

a)       I_C=5.12 mA and V_CE=14.66 V

b)       I_C=10.24 mA and V_CE=7.43 V

c)       I_C=10.24 mA and V_CE=1.466 V

d)       I_C=5.12 mA and V_CE=19.88 V

This problem treats the problem of quiescent point. For the circuit presented in the figure 18, determine the quiescent point (I_C and V_CE). Assume that     and V_BE=0.7V for the transistor. One considers that the current is measured in mA, the voltage in V and the resistance in K.

Figure 18

a)      

a)       I_C=4 mA and V_CE=4.4 V

b)       I_C=2 mA and V_CE=4.4 V

c)       I_C=4 mA and V_CE=2.2 V

d)       I_C=2 mA and V_CE=2.2 V

This problem treats the problem of quiescent point. For the circuit presented in figure 19, determine the quiescent point (I_C and V_CE). Assume that     and V_BE=0.7V for the transistor. One considers that the current is measured in mA, the voltage in V and the resistance in K.

Figure 19

a)      

a)       I_C=3.8 mA and V_CE=2.6 V

b)       I_C=3.8 mA and V_CE=5.2 V

c)       I_C=1.91mA and V_CE=2.6 V

d)       I_C=1.91mA and V_CE=5.2 V

This problem treats the problem of quiescent point. For the circuit presented in figure 20, determine the quiescent point (I_C and V_CE). Assume that     and V_BE=0.7V for the transistor. One considers that the current is measured in mA, the voltage in V and the resistance in K.

Figure 20

a)      

a)       I_C=2 mA and V_CE=15 V

b)       I_C=2 mA and V_CE=7.5 V

c)       I_C=1 mA and V_CE=15 V

d)       I_C=1 mA and V_CE=7.5 V

This problem treats the problem of quiescent point. For the circuit presented in figure 21, determine the quiescent point (I_C and V_CE). Assume that     and V_BE=0.7V for the transistor. One considers that the current is measured in mA, the voltage in V and the resistance in K.

Figure21

a)      

a)       I_C=0.91 mA and V_CE=7.1 V

b)       I_C=0.91 mA and V_CE=14.2 V

c)       I_C=1.8 mA and V_CE=7.1 V

d)       I_C=1.8 mA and V_CE=14.2 V

This problem treats the problem of quiescent point. For the circuit presented in figure 22, determine the quiescent point (I_C and V_CE). Assume that     and V_BE=0.7V for the transistors. One considers that the current is measured in mA, the voltage in V and the resistance in K.

Figure 22

a)       I_C1=2 mA and V_CE1=13 V

I_C2=2 mA    and V_CE2=13 V

b)       I_C1=2 mA and V_CE1=15 V

I_C2=2 mA    and V_CE2=26 V

c)       I_C1=1 mA and V_CE1=0.7 V

I_C2=1 mA    and V_CE2=26 V

d)       I_C1=1 mA and V_CE1=0.7 V

I_C2=2 mA and V_CE2=20 V