# A material has conductivity of 10-2 mho/m and a relative permittivity of 4.The frequency at which the   conduction current in the medium is equal to the displacement current is

1.   45 MHz

2.  90 MHz

3.  450 MHz

4.  900 MHz

4

45 MHz

Explanation :
No Explanation available for this question

# A uniform plane electromagnetic wave incident normally on a plane surface of a dielectric material is reflected with a VSWR of 3.what is the percentage of incident power that is reflected

1.  10%

2.  25%

3.  50%

4.  75%

4

25\%

Explanation :
No Explanation available for this question

# A medium wave radio transmitter operating at a wavelength of 492m has a tower antenna of height  124m.What is the radiation resistance of the antenna

1.   25Ω

2.  36.5Ω

3.  50Ω

4.  73Ω

4

25Ω

Explanation :
No Explanation available for this question

# An electrical system and its signal-flow graph representations are shown in the figure respectively.      The values of G2 and H, respectively are

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# In a uniform linear array, four isotropic radiating elements are spaced λ/4 apart.The progressive phase shift between the elements required for forming the main beam at 600 off the end-fire is

4

Explanation :
No Explanation available for this question

# The signal flow graph that DOES NOT model the plant transfer function H(s) is

1.

2.

3.

4.

4

Explanation :
No Explanation available for this question

# The bias current IDC through the diodes is

1.  1 mA

2.  1.28 mA

3.  1.5 mA

4.  2 mA

4

1 mA

Explanation :
No Explanation available for this question

# The ac output voltage vac is

1.  0.25cos mV 0.25cos mV     (B)  1cos (ωt)  mV  (C)  2cos (ωt) mV       (D) 22cos(ωt)  mV

2.  1cos (ωt)  mV

3.  2cos (ωt) mV

4.  22cos(ωt)  mV

4

2cos (ωt) mV

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

1.  100

2.  110

3.  90

4.  95

4