# Which one of the following function qualifies to be an autocorrelation function of a real valued time signal

1.  sin(ωt)

2.  exo(-t)

3.  ∂(t)

4.  u(t)

4

∂(t)

Explanation :
No Explanation available for this question

# The auto-correlation function of white noise is (a) a delta function (b) a constant (c) gaussian (d) exp (-|t|) with tumid notation

1.  a delta function

2.  a constant

3.  gaussian

4.  (d) exp (-|t|) with tumid notation

4

a delta function

Explanation :
No Explanation available for this question

# The spectral density of white noise is

1.  Exponential

2.  Uniform

3.  Poisson

4.  Gaussian

4

Uniform

Explanation :
No Explanation available for this question

# The power density spectrum (PSD) of noise process is given by The noise is passed through a unit-gain ideal band pass filter, centered at 2MHz.The output noise power will be

1.  2NB

2.  NB

3.  NB/2

4.  4NB

4

NB

Explanation :
No Explanation available for this question

# The open-loop DC gain of a unity negative feedback system with closed-loop transfer function is

1.

2.

3.  4

4.   13

4

Explanation :
No Explanation available for this question

# A system has the transfer function It is called

1.  low-pass system

2.  high-pass system

3.  all-pass system

4.   none of these

4

high-pass system

Explanation :
No Explanation available for this question

# The transfer function of a system is . The characterstic equation of the system is

1.  2s2+6s+5=0

2.  (s+1)2(s+2)=0

3.  2s2+6s+5+(s+1)2(s+2)=0

4.   2s2+6s+5-(s+1)2(s+2)=0

4

(s+1)2(s+2)=0

Explanation :
No Explanation available for this question

# The transfer function of a tachometer is of the form

1.  Ks

2.

3.

4.

4

Ks

Explanation :
No Explanation available for this question

# A card is taken out of a pack of 52 cards numbered 2 to 53.The probability that the numbers on the card is a prime number less than 20 is

1.  1/13

2.  2/13

3.  3/13

4.  4/13

4

2/13

Explanation :
No Explanation available for this question

# The probability of getting a number between 1 and 100.Which is divisible by one and itself only is

1.  27/185

2.  23/97

3.  25/98

4.  None of these

4