Electronics and Communication Engineering - Analog Electronics

36. 

In figure, V0 =

A. zero
B. 5.7 V
C. 6.9 V
D. 12.6 V

Answer: Option C

Explanation:

Output voltage is j 6.3 + 0.7 V.


37. 

In the op-amp circuit of figure, V0 =

A. 10 V
B. -10 V
C. 5 V
D. -5 V

Answer: Option B

Explanation:


38. 

In figure the zener has a resistance of 5 ohms. As the load resistance is varied, the output voltage

A. will remain constant at 12 V
B. will vary between 12.05 and 12.65 V
C. will vary from 10 to 20 V
D. will remain constant at 12.05 V

Answer: Option B

Explanation:

V0 = 12 + Iz x 5, Max Iz = 130 mA, minimum Iz = 10 mA.


39. 

Percentage increase in the reverse saturation current of a diode if the temperature is increased from 25°C to 50°C

A. 50%
B. 500%
C. 565.7%
D. 575.6%

Answer: Option C

Explanation:

= 2(T2 - T1)/10

= 2(50-25)/10 x 100% 565.7% .


40. 

The transistor of following figure in Si diode with a base current of 40 μA and ICBO = 0, if VBB = 6V, RE = 2 kΩ and β = 90, IBQ = 20 μA then IEQ =

A. 1800 μA
B. 180 μA
C. 2000 μA
D. 3000 μA

Answer: Option A

Explanation:

, ICQ = β IBQ = 90 x 20 μA = 1800 μA.