# In  a GSM  system,  8  channels  can  co-exist  in  200  kHz  bandwidth  using  TDMA. A GSM based cellular operator is allocated 5 MHz bandwidth. Assuming a frequency reuse factor of    (1/5),  i.e.  a  five-cell  repeat  pattern,  the maximum  number  of  simultaneous  channels that can exist in one cell is

1.  200

2.  40

3.  25

4.  5

4
Correct Answer :

40

Explanation :
No Explanation available for this question

# The region of convergence of Z-transform of the sequence (5/6)n u(n) - (6/5)n u(- n -1) must be

1.  | z | < 5/6

2.  | z | > 6/5

3.  5/6 < | z | < 6/5

4.  6/5 < | z | < ∞

4
Correct Answer :

5/6 < | z | < 6/5

Explanation :
No Explanation available for this question

# In a Direct Sequence CDMA system the chip rate is 1.2288 x 106 chips per second. If the processing gain is desired to be AT LEAST 100, the data rate

1.  must be less than or equal to 12.288 x 103 bits per sec

2.  must be exactly equal to 12.288 x 103 bits per sec

3.  must be greater than 12.288 x 103 bits per sec

4.  can take any value less than 122.88 x 103 bits per sec

4
Correct Answer :

must be less than or equal to 12.288 x 103 bits per sec

Explanation :
No Explanation available for this question

# The  condition  on  R,  L  and  C  such  that  the  step  response  y(t)  in  the  figure  has  no oscillations, is

1.  R ≥ 1/2√(L/C)

2.  R ≥ √(L/C)

3.  R ≥ 2√(L/C)

4.  R = 1/(√LC)

4
Correct Answer :

R ≥ 2√(L/C)

Explanation :
No Explanation available for this question

# The ABCD parameters of an  ideal n  : 1  transformer shown  in  the  figure are    .The value of X will be

1.  n

2.  1/n

3.  n2

4.  1/n2

4
Correct Answer :

1/n

Explanation :
No Explanation available for this question

# An  air-filled  rectangular  waveguide  has  inner  dimensions  of  3  cm  x  2  cm.  The  wave impedance of the TE20 mode of propagation in the waveguide at a frequency of 30 GHz is (free space impedance η0 = 377 Ω)

1.  308 Ω

2.  355 Ω

3.  400 Ω

4.  461 Ω

4
Correct Answer :

400 Ω

Explanation :
No Explanation available for this question

# The   field (in A/m) of a plane wave propagating in free space is given by H =   (5√(3)/η0) cos (ωt - βz) +   (5/η0) sin (ωt - βz + (π/2)). The time average power flow density in Watts is

1.  η0/100

2.  100/η0

3.  50 η02

4.  50/η0

4
Correct Answer :

50/η0

Explanation :
No Explanation available for this question

# In a series RLC circuit, R = 2 kΩ, L = 1 H, and C(1/400) = μF. The resonant frequency is

1.  2 × 104 Hz

2.  (1/π) × 104 Hz

3.  104 Hz

4.  2π × 104 Hz

4
Correct Answer :

(1/π) × 104 Hz

Explanation :
No Explanation available for this question

# The  maximum  power  that  can  be  transferred  to  the  load  resistor  RL  from  the  voltage source in the figure is

1.  1 W

2.  10 W

3.  0.25 W

4.  0.5 W

4
Correct Answer :

0.25 W

Explanation :
No Explanation available for this question

# The  field in a rectangular waveguide of inner dimensions a × b is given by =ωμ/h2(π/a) H0 sin(2πx/a) sin (ωt - βz) where H0  is a constant, and a and b are  the dimensions along  the x-axis and  the y-axis respectively. The mode of propagation in the waveguide is

1.  TE20

2.  TM11

3.  TM20

4.  TE10

4
Correct Answer :

TE20

Explanation :
No Explanation available for this question

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