# A system with input x[n] and output y[n] is given as y[n] = (sin (5/6) π n) x(n). The system is

1.  linear, stable and invertible

2.  non-linear, stable and non-invertible

3.  linear, stable and non-invertible

4.  linear, unstable and invertible

4

linear, stable and non-invertible

Explanation :
No Explanation available for this question

# The unit-step response of a system starting from rest is given by C(t) = 1 - e-2t for t ≥ 0  The transfer function of the system is

1.  1/(1 + 2s)

2.  2/(2 + s)

3.  1/(2 + s)

4.   2s/(1 + 2s)

4

2/(2 + s)

Explanation :
No Explanation available for this question

# The Nyquist plot of G (jω) H (jω) for a closed loop control system, passes through (-1, j0) point in the GH plane. The gain margin of the system in dB is equal to

1.  infinite

2.  greater than zero

3.  less than zero

4.  zero

4

zero

Explanation :
No Explanation available for this question

# The unit impulse response of a system is h(t) = e-t, t ≥ 0 For this system, the steady-state value of the output for unit step input is equal to

1.  -1

2.  0

3.  1

4.  ∞

4

1

Explanation :
No Explanation available for this question

# The transfer function of a phase-lead compensator is given by Ge(s) = (1 + 3Ts)/(1 + Ts) where T > 0  The maximum phase-shift provided by such a compensator is

1.  π/2

2.  π/3

3.  π/4

4.  π/6

4

π/6

Explanation :
No Explanation available for this question

# The minimum step-size  required  for a Delta-Modulator operating at 32 K samples/sec  to track the signal (here u(t) is the unit-step function) x(t) = 125 t(u(t) - u(t - 1)) + (250 - 125t) (u(t - 1) - u(t - 2))  so that slope-overload is avoided, would be

1.  2-10

2.  2-8

3.  2-6

4.  2-4

4

2-8

Explanation :
No Explanation available for this question

# A zero-mean white Gaussian noise is passed through an ideal lowpass filter of bandwidth  10 kHz. The output is the uniformly sampled with sampling period ts = 0.03 msec. The samples so obtained would be

1.  correlated

2.  statistically independent

3.  uncorrelated

4.  orthogonal

4

statistically independent

Explanation :
No Explanation available for this question

# A  source  generates  three  symbols  with  probabilities  0.25,  0.25,  0.50  at  a  rate  of  3000 symbols  per  second.  Assuming  independent  generation  of  symbols,  the  most  efficient source encoder would have average bit rate as

1.  6000 bits/sec

2.  4500 bits/sec

3.  3000 bits/sec

4.  1500 bits/sec

4

4500 bits/sec

Explanation :
No Explanation available for this question

# The  diagonal  clipping  in  Amplitude  Demodulation  (using  envelope  detector)  can  be avoided  if  RC  time-constant  of  the  envelope  detector  satisfies  the  following  condition, (here W is message bandwidth and ωc is carrier frequency both in rad/sec)

1.  RC < 1/W

2.  RC > 1/W

3.  RC < 1/ωc

4.  RC > 1/ωc

4

RC < 1/W

Explanation :
No Explanation available for this question

# Group  I  lists  four  different  semiconductor  device. Match  each  device  in Group  I with  its characteristic property in Group II.

1.  P-3, Q-1, R-4, S-2

2.  P-2, Q-4, R-3, S-2

3.  P-3, Q-4, R-1, S-2

4.  P-3, Q-2, R-1, S-4

4