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 Diode Applications Multiple Choice

1 .       Refer to Figures 2.3a and 2.4. Determine the value of IDQ if E = 5 V. [Hint]

 0 mA 4.1 mA 5 mA 10 mA

2 .       In a particular problem, which mode has the highest level of IDQ? [Hint]

 ideal approximate equivalent exact mode using characteristic curve none of the above

3 .       Which diode(s) has (have) a zero level current and voltage drop in the ideal model? [Hint]

 Si Ge both Si and Ge neither Si nor Ge

4 .       Refer to Figure 2.18. Determine the current level if E = 15 V and R = 3 k. [Hint]

 0 A 4.76 mA 5 mA 5 A

5 .       Refer to Figure 2.18. Determine the voltage across the resistor if E = 0.2 V. [Hint]

 0 V 0.09 V 0.2 V 0.44 V

6 .       Refer to Figure 2.23. Determine the new value of the load resistor if ID = 2 mA. [Hint]

 5 k 5.5 k 6 k none of the above

7 .       Refer to Figure 2.23. Replace Ge with Si (same direction) and then determine ID. [Hint]

 0 mA 1.893 mA 2.036 mA 2.143 mA

8 .       Determine V2 from Figure 2.29 if E2 is changed to +5 V. [Hint]

 3.201 V 0 V 4.3 V 1.371 V

9 .       A diode is in the "_____ " state if the current established by the applied sources is such that its direction matches that of the arrow in the diode symbol, and VD 0.7 V for Si and VD 0.3 V for Ge. [Hint]

 off on neutral quiescent

10 .       An open circuit can have any voltage across its terminals, but the current is always _____ A. [Hint]

 5 0 1

11 .       A short circuit has a(n) _____ V drop across its terminals, but the current is limited only by the surrounding network. [Hint]

 5 0 1

12 .       Refer to Figure 2.32. Determine ID 2 if both Si diodes are replaced by identical Ge diodes (same direction). [Hint]

 29.40 mA 30.30 mA 14.70 mA none of the above

13 .       Refer to Figure 2.32. Determine ID1 if D2 is replaced by a Ge diode. [Hint]

 0 mA 29.40 mA 14.70 mA 14.09 mA

14 .       Refer to Figure 2.38. Determine ID 2 if VT 2 is changed to 0.3 V. [Hint]

 6.061 mA 0.7 mA 3.302 mA 3.571 mA

15 .       Refer to Figure 2.43. Determine the current through each diode if E1 = E2 = 0 V. [Hint]

 4.65 mA 9.3 mA 18.6 mA 0.7 mA

16 .       Refer to Figure 2.43. Determine Vout if E1 = E2 = 10 V. [Hint]

 9.3 V 10 V –10 V 0 V

17 .       Refer to Figure 2.40. What is the logic function of the circuit? [Hint]

 Positive logic AND gate Positive logic OR gate Negative logic AND gate Negative logic OR gate

18 .       Refer to Figure 2.43. What is the logic function of the circuit? [Hint]

 Positive logic AND gate Positive logic OR gate Negative logic AND gate Negative logic OR gate

19 .       Refer to Figure 2.45. What best describes the circuit? [Hint]

 full-wave rectifier half-wave rectifier clipper clamper

20 .       Refer to Figure 2.65. Determine the peak value of the current through the load resistor. [Hint]

 2.5 mA 5 mA 1.25 mA 0 mA

21 .       Refer to Figure 2.65. Determine the average value of the current through the load resistor. [Hint]

 2.5 mA 0 mA 1.37 mA 1.59 mA

22 .       Refer to Figure 2.54. What best describes the circuit? [Hint]

 full-wave rectifier half-wave rectifier clipper clamper

23 .       List the categories of clippers. [Hint]

 series parallel series and parallel none of the above

24 .       Determine the peak value of the output waveform if the polarity of 5 V is changed in Figure 2.76. [Hint]

 25 V 15 V –25 V –15 V

25 .       Determine the peak for both half cycles of the output waveform if V polarity is changed in Figure 2.85. [Hint]

 16 V, –4 V 16 V, 4 V –16 V, 4 V –16 V, –4 V

26 .       Refer to Figure 2.70. What best describes the circuit? [Hint]

 full-wave rectifier half-wave rectifier clipper clamper

27 .       Determine the total discharge time for the capacitor in a clamper having C = 0.01 F and R = 500 k. [Hint]

 5 ms 25 ms 2.5 ms 50 ms

28 .       Refer to Figure 2.111. Calculate IL and IZ if RL is changed to 5 k. [Hint]

 2 mA, 0 mA 4 mA, 2 mA 2 mA, 2 mA 2 mA, 4 mA

29 .       Refer to Figure 2.115. With the Zener diode in the "on state", what is the level of IZ for the maximum load resistor Rmax? [Hint]

 0 mA undefined equal to IRL IZM

30 .       In a voltage regulator network with fixed RL and R, what element dictates the minimum level of source voltage? [Hint]

 VZ IZ IZM none of the above

31 .       In a voltage regulator network (Figure 2.117) with fixed R and RL, what element dictates the maximum level of source voltage? [Hint]

 VZ IZM IZ none of the above

32 .       What is the peak inverse voltage across each diode in a voltage doubler? [Hint]

 Vm 2Vm 0.5Vm 0.25Vm

33 .       If the secondary voltage of the transformer in Figure 2.124 is 5 V, what is the voltage measured from the negative terminal of C4 to the negative terminal of the transformer? [Hint]

 –10 V –20 V 10 V 20 V

34 .       In a voltage-multiplier circuit, the number of diodes is directly proportional to the multiplicative voltage factor. [Hint]

 True False

35 .       Rectifiers are commonly used in battery chargers. [Hint]

 True False

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