University Questions with Answers (Long Answered Questions)

University Questions with Answers (Long Answered Questions)

Dec.-14

Q.8 Determine R_if, R_of, A_v and A_vf  for the following :

i) Voltage shunt feedback amplifier ii) Current series feedback amplifier.

[Section 9.12]       [16]

May-15

Q.9 Draw circuit of CE amplifier with current series feedback and obtain the expression for feedback ratio, uoltage gain, input and output resistances.

[Section 9.12.2]    (16)

Dec.-15

Q.10 Sketch the circuit diagram of a two-stage capacitor coupled BJT amplifier that uses series voltage negative feedback. Briefly explain how the feed back operates. [Section 9.12.1.1]          (16)

May-17

Q.11 With a neat block diagram, explain the operation of following feedback amplifiers.

i) Voltage series feedback amplifier

ii) Current shunt feedback amplifier

[Sections 9.5, 9.9] [13]

Dec.-17

Q.12 When a portion of the output signal is fed to input, as you are aware, feedback is generated. Distinguish between negative feedback and positive feedback and elaborate on their individual advantages. How different parameters of an amplifier (say) will be affected by these two types of feedback ? (Section 9.1) [15]