# If S represents the carrier synchronization at the receiver and  ρ represents the bandwidth efficiency, then the correct statement for the coherent binary PSK is

1.  ρ = 0.5, S is required

2.  ρ = 1.0, S is required

3.  ρ = 0.5, S is not required

4.  ρ = 1.0, S is not required

4

ρ = 1.0, S is not required

Explanation :
No Explanation available for this question

# A  signal  is  sampled  at  8  kHz  and  is  quantized  using  8-bit  uniform  quantizer.  Assuming SNRq for a sinusoidal signal, the correct statement for PCM signal with a bit rate of R is

1.   R = 32 kbps, SNRq = 25.8 dB

2.  R = 64 kbps, SNRq = 49.8 dB

3.  R = 64 kbps, SNRq = 55.8 dB

4.  R = 32 kbps, SNRq = 49.8 dB

4

R = 64 kbps, SNRq = 49.8 dB

Explanation :
No Explanation available for this question

# The circuit shown in the figure has 4 boxes each described by inputs P, Q, R and outputs Y, Z with The circuit acts as a

1.  4 bit adder giving P + Q

2.  4 bit subtractor giving P - Q

3.  4 bit subtractor giving Q - P

4.  4 bit adder giving P + Q + R

4

4 bit subtractor giving P - Q

Explanation :
No Explanation available for this question

# Medium 1 has the electrical permittivity  ε 1 = 1.5ε0 farad/m and occupies the region to the left  of  x  =  0  plane.  Medium  2  has  the  electrical  permittivity  ε 2  =  2.5 ε 0  farad/m  and occupies the region to the right of x = 0 plane. If E1 in medium 1 is E1 = (2ux - 3uy + 1uz) volt/m, then E2 in medium 2 is

1.   (2.0ux - 7.5uy + 2.5uz) volt/m

2.   (2.0ux - 2.0uy + 0.6uz) volt/m

3.   (1.2ux - 3.0uy + 1.0uz) volt/m

4.  (1.2ux - 2.0uy + 0.6uz) volt/m

4

(1.2ux - 3.0uy + 1.0uz) volt/m

Explanation :
No Explanation available for this question

# If the functions W, X, Y and Z are as follows Then

1.

2.  W = Z, X = Y

3.  W = Y

4.

4 Explanation :
No Explanation available for this question

# If the electric field intensity is given by E = (xux + yuy + zuz) volt/m, athe potential difference between X (2, 0, 0) and Y (1, 2, 3) is

1.  +1 volt

2.  -1 volt

3.  +5 volt

4.  +6 volt

4

+5 volt

Explanation :
No Explanation available for this question

# Let P be linearity, Q be time-invariance, R be causality and S be stability. A discrete-time system has the input-output relationship, where x(n) is the input and y(n) is the output. The above system has the properties

1.  P, S but not Q, R

2.  P, Q, S but not R

3.  P, Q, R, S

4.  Q, R, S but not P

4

P, S but not Q, R

Explanation :
No Explanation available for this question

# A uniform plane wave  traveling  in air  is  incident on  the plane boundary between air and another dielectric medium with εr = 4. The reflection coefficient for the normal incidence, is

1.  zero

2.  0.5  180°

3.  0.333  0°

4.  0.333  180°

4

0.333  180°

Explanation :
No Explanation available for this question

# If the electric field intensity associated with a uniform plane electromagnetic wave travelling in a perfect dielectric medium is give by E (z, t) = 10 cos (2 π x 107 t = 0.1π z) volt/m, then the velocity of the travelling wave is

1.  .00 x 108 m/sec

2.  2.00 x 108 m/sec

3.  6.28 x 107 m/sec

4.  2.00 x 107 m/sec

4

2.00 x 108 m/sec

Explanation :
No Explanation available for this question

# Let X be the Gaussian random variable obtained by sampling the process at

1.  1 - Q(0.5)

2.  Q(0.5)

3.  Q(1/(2√2))

4.  1 - Q(1/(2√2))

4