1. In the figure shown, a silicon diode is carrying a constant current of 1 mA. When the temperature of the diode is 20

a. 740 mV

b. 660 mV

c. 680 mV

d. 700 mV

2. If the transistor in figure is in saturation, then

3. A zener diode regulator in figure, is to be designed to meet the specifications : I

4. Consider the following statements in connection with the CMOS inverter in figure, where both the MOSFETs are of enhancement type and both have a threshold voltage of 2 volts.

Which of the following is correct.

a. Only S

b. Only S

c. Both are TRUE

d. Both are FALSE

5. Each transistor in figure, has a dc current gain β

Determine

(a) The minimum value I

(b) The maximum permissible value for the resistance R

(c) The worst case high input (logic 1) and the worst case low input (logic 0)

for which T

^{o}C, diode voltage is found to be 700 mV. If the temperature rises to 40^{o}C, diode voltage becomes approximately equal toa. 740 mV

b. 660 mV

c. 680 mV

d. 700 mV

**Solution :**https://www.youtube.com/watch?v=wqUUbrQy-CI2. If the transistor in figure is in saturation, then

**Solution :**https://www.youtube.com/watch?v=eGQmSi1Xdxk

3. A zener diode regulator in figure, is to be designed to meet the specifications : I

_{L}= 10 mA, V_{o}= 10 volts and V_{in}varies from 30 to 50 volts. The zener diode has V_{Z}= 10 volts and I_{ZK}(knee current) = 1 mA. For satisfactory operation**Solution :**https://www.youtube.com/watch?v=OCR60jVExa4

4. Consider the following statements in connection with the CMOS inverter in figure, where both the MOSFETs are of enhancement type and both have a threshold voltage of 2 volts.

**S**T_{1}:_{1}conducts when V_{I}≥ 2 volts.**S**T_{2}:_{1}is always in saturation when V_{o}= 0 volts.Which of the following is correct.

a. Only S

_{1}is TRUEb. Only S

_{2}is TRUEc. Both are TRUE

d. Both are FALSE

**Solution :**https://www.youtube.com/watch?v=lm9CG4kv7NU

5. Each transistor in figure, has a dc current gain β

_{dc}= 50, cut in voltage V_{γ}= 0.65 volts and V_{BEsat}= 0.75 volts. The output voltage V_{o}for T_{2}in saturation can be as high as 0.2 volts. Assume 0.7 volts drop across a conducting PN junction.Determine

(a) The minimum value I

_{B2}necessary to keep T_{2}saturation.(b) The maximum permissible value for the resistance R

_{B1}.(c) The worst case high input (logic 1) and the worst case low input (logic 0)

for which T

_{2}will be either in saturation or in cut off.**Solution :**https://www.youtube.com/watch?v=J4uyyFXmVM4

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