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ESE 2021 Technical Quiz 14 || Amplifiers

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Question 1

A three stage amplifier with identical stages with lower cut off frequency per stage ‘f₁’ is given overall negative feedback. Depending on the overall gain, the system may oscillate at a low frequency f_c given by

Question 2

Consider the feedback circuit shown in figure.

The feedback network used in the circuit has …………………… type of feedback topology.

Question 3

A class B push pull amplifier must deliver low of audio power to the output load. If the output transformer is 80% efficient then what is the minimum average dissipation rating required for each transistor ?

Question 4

Consider an amplifier circuit shown in figure. If the transistors θ₁ and θ₂ parameters g_m1, r_π1 and g_m2, r_π2 respectively then voltage gain |Av| is

Question 5

For the Darlington amplifier shown in figure below as :

Both Q₁ and Q₂ are identical with h parameter h_fc = 100, R_E = h_ie = 1 kΩ. If z parameter of the circuit diagram is given as

Then is

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ESE & GATE EC Analog Circuits

Apr 21ESE & GATE EC