Q1:

In a transistor push-pull amplifier

a. There is no d c present in the output

b. There is no distortion in the output.

c. There is no even harmonic in the output.

d. There is no odd harmonic in the output.

Q2:

The value of C required for Sinusoidal oscillation of freq. 1KH_Z in the circuit of figure below is

Q3:

Three amplifier each of gain $\raisebox{1ex}{$A_o$}\!\left/ \!\raisebox{-1ex}{$2$}\right.$and producing a phase of 60^o are connected in tandem. The feedback loop is closed through a positive gain of 0.008. What should be the value of A_O for the system to be oscillatory?

Q4:

In the following astable multi-vibrator circuit, which properties of $V_o\left(t\right)$depends on$R_2$?

Q5:

Match List- I (circuit Name) with List- II (characteristic) and select the correct answer using the codes given below the lists.

List-I	List-II
A. Schmitt trigger	1. It needs a pulse transformer.
B. Monostable multivibrator	2. It is used to generate generating pulse whose width can be controlled.
C. Astable multivibrator	3. It is bistable Circuit.
D. Blocking Oscillator	4. It has no stable state.

 

Q6:

Consider the following

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

Which of these use feedback amplifier

Q7:

An npn transistor has a beta cut- off frequency f_B of 1 MH_Z and common Emitter short circuit low frequency current gain ${\beta }_O$of 200 at unity gain frequency f_T and the alpha cut- off freq. $f_{\alpha }$respectively are:-

Q8:

If Q of a single-stage single-tuned amplifier is doubled, than its bandwidth will

Q9:

A good current buffer has.

Q10:

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

Q11:

An amplifier has an open loop gain of $1000\pm 10.$Negative feedback is provided such that the gain variation remains within 0.1%. What is the amount of feedback ${\beta }_F$?

Q12:

The amplifier circuit shown in the figure is an example of

Q13:

Given $r_d=20K\Omega ,I_{DSS}=10mA,V_P=-8V.$

Transconductance in milli-Siemens (ms) and Voltage gain of the Amplifier are respectively

Q14:

Given $r_d=20K\Omega ,I_{DSS}=10mA,V_P=-8V.$

$Z_i$ and $Z_O$of the circuit are respectively

Q15:

A JFET (with tuned load in the drain Circuit) is operated as a tuned Amplifier. Given for the FET $g_m=3\times {10}^{-3},r_d=60K\Omega ,C_{ds}=10PF$and for the drain circuit $L=10mH$is parallel with$R=80K\Omega ,C=90PF,R_D=30K\Omega .$.

The magnitude of Voltage gain of the amplifier at resonance is __________________

Q16:

In the following amplifier circuit g_m1 and g_m2 are the small Signal parameters of M₁ and M₂ respectively. Assume$\lambda =0$, what is the Small Signal Voltage gain$\left|\frac{V_O}{V_{IN}}\right|$?

Q17:

A power supply has a full – load voltage of 24 V. What is its no – load voltage for 5% regulation?

Q18:

The DC current gain $(\beta )$of a BJT is 50. Assuming that the emitter injection efficiency is 0.995, the base transport factor is

Q19:

$\alpha$cut- off frequency of a bipolar junction transistor.

Q20:

Diodes are used to compensate which of the following transistor circuit parameters.

1. I_CO

2. V_BE

3. $\beta$