# The probability of bit error is

1.   0.5 x e-3.5

2.   0.5 x e-5

3.   0.5 x e-7

4.   0.5 x e-10

4

0.5 x e-10

Explanation :
No Explanation available for this question

# For the constraint that the minimum distance between pairs of signal points be d for both constellations, the radii r1 and r2 of the circles are

1.   r1=0.707d, r2=2.782d

2.  r1=0.707d, r2=1.932d

3.  r1=0.707d, r2=1.545d

4.  r1=0.707d, r2=1.307d

4

r1=0.707d, r2=1.307d

Explanation :
No Explanation available for this question

# Assuming high SNR and that all signals are equally probable, the additional average transmitted signal energy required by the 8-PSK signal to achieve the same error probability as the 4-PSK signal is

1.  11.90 dB

2.  8.73 dB

3.  6.79 dB

4.  5.33 dB

4

5.33 dB

Explanation :
No Explanation available for this question

# A BPSK scheme operating over an A WGN channel with noise power spectral density of N0/2, uses equi probable signals s1(t)=√2E/T sin (ωct) and s2(t)=√2E/T sin (ωct) over the symbol interval, (0, T). If the local oscillator in a coherent receiver is ahead in phase by 450 with respect to the received signal, the probability of error in the resulting system is

1.   Q(√2E/N0)

2.  Q(√E/N0)

3.  Q(√E/2N0)

4.  Q(√E/4N0)

4

Q(√E/N0)

Explanation :
No Explanation available for this question

# The electric field component time harmonic plane EM wave traveling in a non-magnetic lossless dielectric medium has an amplitude of 1 V/m. If the relative permittivity of the medium is 4, the magnitude of the time-average power density vector (in W/m2) is

1.   1/30π

2.  1/60π

3.  1/120π

4.  1/240π

4

1/120π

Explanation :
No Explanation available for this question

# Consider a closed surface S surrounding a volume V. If  is the position vector of a point inside S, with  the unit normal on S, the value of the integral   is

1.   3V

2.  5V

3.  10V

4.  15V

4

15V

Explanation :
No Explanation available for this question

# The divergence of the vector field  is

1.   0

2.  1/3

3.  1

4.  3

4

3

Explanation :
No Explanation available for this question

# Consider a closed surface S surrounding a volume V. If   is the position vector of a point inside S, with   the unit normal on S, the value of the integral   is

1.   3V

2.  5V

3.  10V

4.  15V

4

15V

Explanation :
No Explanation available for this question

# Consider the following statements regarding the complex poynthing vector  for the power radiated by a point source in an infinite homogeneous and lossless medium. Re() denotes the real part of  , S denotes a spherical surface whose centre is at the point source, and  denotes the unit surface normal on S. Which of the following statements is

1.   remains constant at any radial distance from the source

2.    increases with increasing  radial distance from the source

3.    remains constant at any radial distance from the source

4.   decreases with increasing  radial distance from the source

4

remains constant at any radial distance from the source

Explanation :
No Explanation available for this question

1.   80 mV/m

2.   2.5 V/m

3.  30 V/m

4.  950 V/m

4