Electronics and Communication Engineering - Analog Electronics

16. 

The inverting op-amp shown in the figure has an open loop gain to 100. The closed loop given is

A. -8
B. -9
C. -10
D. -11

Answer: Option D

Explanation:

Applying KCL inverting node

.


17. 

In a voltage regulated power supply the zener operates in the breakdown region when (Vin is input voltage and Vz is zener breakdown voltage)

A. Vin < Vz
B. Vin > Vz
C. Vin = Vz
D. both (a) or (b)

Answer: Option B

Explanation:

Zener breakdown when input voltage is more than zener breakdown voltage.


18. 

The parameter h11 for CB circuit is higher than that for CE circuit.

A. True
B. False

Answer: Option B

Explanation:

It is lower.


19. 

Figure shows a self bias circuit for FET amplifier, ID = 4 mA. Then IS =

A. 4 mA
B. 2 mA
C. 0.4 mA
D. 0.2 mA

Answer: Option A

Explanation:

Since gate current is negligible IS = ID = 4 mA.


20. 

In the CE equivalent circuit of figure, the voltage gain is

A. 200
B. 40
C. 5
D. 1000

Answer: Option A

Explanation: