Analog Electronic Circuits Laboratory Viva Questions 2

Theory_Questions:

When the two input terminals of a differential amplifier are grounded,

(A) The base currents are equal

(B) The collector currents are equal

(C) An output error voltage usually exists

(D) The output voltage is zero

Answer: [C] An output error voltage usually exists

2. One source of error output voltage is

(A) Input bias current

(B) The difference in collector resistors

(C) The emitter current

(D) Common mode voltage gain

Answer: [B] The difference in collector resistors

3. A common mode signal is applied to

(A) The inverting terminal

(B) The non-inverting terminal

(C) Both the terminals

(D) The top of the emitter resistor

Answer: [C] Both the terminals

4. The tail of a differential amplifier acts as a

(A) Battery

(B) Current source

(C) Transistor

(D) Diode

Answer: [B] Current source

5. When the two bases are grounded in a differential amplifier, the voltage across the emitter diode is

(A) Zero

(B) 0.7 V

(C) The same

(D) High

Answer: [C] The same

Problematic_Questions:

6. What is the ideal value of the current that is flowing through the 7.5 K resistor?

(A) 5 mA

(B) 10 mA

(C) 30/12.5 mA

(D) 2 mA

Answer: [D] 2 mA

7. What are the ideal emitter currents of each transistor?

(A) 2.5 mA

(B) 5 mA

(C) 1 mA

(D) 1.2 mA

Answer: [C] 1 mA

8. What are the ideal quiescent collector voltages of each transistor?

(A) 2.5 V

(B) 10 V

(C) 9 V

(D) -10 V

Answer: [B] 10 V

9. If a 1 mV a.c voltage is applied to a base of Q1, then calculate voltage gain?

(A) 200

(B) 250

(C) 150

(D) 100

Answer: [A] 200

10. Input impedance of the differential amplifier equal to

(A) 15 K

(B) 10 K

(C) 7.5 K

(D) 20 K

Answer: [A] 15 K


Analog Electronic Circuits Laboratory Viva Questions 1
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