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# GATE EC 2021: Analog Circuits Quiz 7 (App update required to attempt this test)

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Question 1

The purpose of emitter bypass capacitor in a CE BJT amplifier is to

Question 2

Calculate the input resistance Ri (in ohms) of the common base amplifier shown.

(consider C1, C2 to very large)

(choose RE = 1kΩ, R1 = 18kΩ,

R2 = 18kΩ, β = 99, rπ =1kΩ, RC = 5kΩ, VCC = 15V)

Question 3

The common emitter circuit, with bypass capacitor removed, is shown in Fig. The hfe = 75, hoe = 1μs, hre = 0, hie= 2.1

Find the input impedance, Zin (in kΩ).

Question 4

For the amplifier shown in the figure below, the BJT parameter are VBE = 0.7 V, β = 200, and thermal voltage, VT = 25 mV. The voltage gain of the amplifier is

Question 5

In below figure, both transistors are identical and have a high value of 'β', VBE =0.7V and VT = 25 mV. The small signal low frequency voltage gain AV = (V0/Vi) is equal to

Question 6

For the following given circuit, find the small signal voltage gain for β = 80 & VA = ∞ and VT = 26 mV.

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