Q1:

Match List-I (Type of feedback) with List-II (effect on R_in and R_out) and select the correct answer using the code given below the lists.

List-I	List-II
A. Voltage series.	1. Rin increases and Rout decreases.
B. Voltage shunt.	2. Rin and Rout decreases.
C. Current series	3. Rin and Rout increases.
D. Current shunt	4. Rin decreases and Rout increases.

 

Q2:

The open loop transfer function of an amplifier with resistive negative feedback has two poles in the left half S-plane then the amplifier.

Q3:

Consider the following

1 Oscillator 2. Emitter follower 3. Cascaded amplifier 4. Power amplifier

Which of these use feedback amplifier

Q4:

The circuit in the figure employs positive feedback and is intended to generate Sinusoidal oscillation. If at a frequency $f_o=\frac{V_f(f)}{V_o(f)}=\frac{1}{6}\angle 0^o$,  then to sustain Oscillation at this frequency.

Q5:

The two stages of a Cascade amplifier have individual upper cut- off frequencies, f₁ = 5 MH_Z and f₂ = 3.33 MH_Z. What is the best approximation for the upper cut- off frequency of the Cascade Combination?

Q6:

An npn transistor (with C=0.3 pF) has a unity-gain cutoff frequency f_T of 400 MH_Z at a dc bias current I_C =1mA. The value of its $C\mu$(in pF) is approximately (V_T = 26 mV)

Q7:

An Amplifier has two identical Cascaded Stages. Each stages has a bandwidth of 20 KH_Z. The overall bandwidth shall approximately be equal to

Q8:

Consider the following statements:

 The lower cut-off frequencies for an RC Coupled CE amplifier depend on:

1. Input and output Coupling capacitor.

2. Emitter bypass capacitor.

3. Junction capacitor.

Which of these statements is/are correct?

Q9:

If the emitter resistance in a common-emitter voltage amplifier is not by passed, it will.

Q10:

Two identical FETs, each characterized by the parameter g_m and r_d are connected in parallel. The composite FET is then characterized by the parameter.

Q11:

Which of the following components control the high frequency response of the R-C Coupled amplifier?

1. Parasitic Capacitance of the transistor

2. Coupled Capacitance

3. Stray Capacitance

4. Wiring Capacitance

Select the correct answer using the code given below.

Q12:

Which one of the following statement is correct.

The rise time of an amplifier is

Q13:

Consider the following statements:

 The lower cut-off frequencies for an RC Coupled CE amplifier depend on:

1. Input and output Coupling capacitor.

2. Emitter bypass capacitor.

3. Junction capacitor.

Which of these statements is/are correct?

Q14:

A BJT is to be used in a high freq. circuit in common emitter amplifier. For a higher upper cut-off frequency ($C\mu ,C\pi$ and $r_o$have their usual meanings)

Q15:

For the emitter-follower circuit shown in figure below has $\beta =200$. Then find the input resistance $R_{in}$is …………………$(inK\Omega )$