The circuit shown in the figure consists of transistors in

1.  Parallel connection

3.  Darlington connection

4

Parallel connection

Explanation :
No Explanation available for this question

The autocorrelation function Rx (t) of the signal X(t) = V sinωt is given by

1.  1/2 V2Cosωt

2.  V2Cosωt

3.  V2Cos2ωt

4.  2 V2Cos2ωt

4

1/2 V2Cosωt

Explanation :
No Explanation available for this question

Circuit of the given figure is an example of

1.  Current series feed back

2.  Current shunt feedback

3.  Voltage series feedback

4.  Voltage shunt feedback

4

Voltage shunt feedback

Explanation :
No Explanation available for this question

If spectral density of a random signal is  p[∂(ω-ω0)+ ∂(ω-ω0)]then auto-correlation function of the signal is

1.  cos ω0t

2.  sin ω0t

3.  cos[ω-ω0)t]

4.  sin[ω-ω0)t]

4

cos ω0t

Explanation :
No Explanation available for this question

In the BJT amplifier shown in the figure, the transistor is biased in the forward active region. Putting a capacitor across RE will

1.  Decreases voltage gain and decrease input impedance

2.  Increase voltage gain and decrease input impedance

3.  Decrease voltage gain and increase input impedance

4.  Increase voltage gain and increase input impedance

4

Increase voltage gain and decrease input impedance

Explanation :
No Explanation available for this question

The probability density function of a random variable X is given as fx(x). A random variable Y is defined as y =ax+b, where a

1.  bfx(y-b/a)

2.  afx(y-b/a)

3.  1/afx(y-b/a)

4.  1/bfx(y-b/a)

4

1/afx(y-b/a)

Explanation :
No Explanation available for this question

A signal process m(t) is mixed with a channel noise n(t). The power spherical density are Sm(ω)=6/9+ω2, S(ω)=6 The optimum Wiener-Hoff filter is

1.   ω2+9/ ω2+10

2.  1/ ω2+10

3.  ω2+10/ ω2+9

4.   none of these

4

1/ ω2+10

Explanation :
No Explanation available for this question

In the circuit shown in figure, N is a finite gain amplifier with a gain of k, a very large input impedance, and a very low output impedance. The input impedance of the feedback amplifier with the feedback impedance Z connected, as shown will be

1.  Z(1-1/k)

2.  Z(1-k)

3.  Z/(k-1)

4.  Z/(1-k)

4

Z/(1-k)

Explanation :
No Explanation available for this question

A 1µ F capacitor is shunted by a 1kΩ maintained at temperature 300 K. The rms noise voltage across capacitor over the entire frequency band is

1.  6.4x10-8V

2.   9.4x10-9 V

3.  2.3x10-10V

4.   4.3x 10-10V

4

6.4x10-8V

Explanation :
No Explanation available for this question

An amplifier operating over the frequency range of 18 to 20 MHz has a 10kΩ input resistance. The RMS noise voltage at the input to the amplifier at ambient temperature of 270C is (assume Boltzman constant value as 1.38x10-23J/K)

1.  18.2microvolts

2.   17.2microvolts

3.  16.2microvolts

4.   14.2microvolts

4