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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]

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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]

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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

 
 
 
 


23 .       List the categories of clippers. [Hint]

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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]

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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

 
 
 
 


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]

 
 
 
 


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

 
 


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

 
 






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