The intrinsic impedance of a conducting medium for which 5 = 58 MS/m, μr = 1 at a frequency f = 100 MHZ

1.   2.14×105∠ 450Ω

2.  1.84x10-3∠-450Ω

3.  3.69x10-3∠-450Ω

4.  3.69x10-3∠-450Ω

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4
Correct Answer :

3.69x10-3∠-450Ω


Explanation :
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The parallel RLC circuit shown in the figure is in resonance. In this circuit

1.  

2.  

3.  

4.  

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4
Correct Answer :


Explanation :
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The amplitude of Ei (incident) in free space (region 1) at the interface with refion 2 is 1V/m. If H0r(reflected) = -1.41 x 10-3 A/m. εr2=18.5 and σ2 = 0p then μr2 will be

1.   99.2

2.  198.4

3.   123

4.  None of the above

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4
Correct Answer :

198.4


Explanation :
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A parabolic reflector is designed to have a directivity of 30db at 300 MHZ. If the aperature efficiency is 55%, then the half-power band width is

1.  4.31

2.  8.620

3.   17.24

4.  None of the above

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4
Correct Answer :

8.620


Explanation :
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A half-wave dipole is placed at a distance S=y/2 from the apex of a 900 corner reflector. Find the radiation intensity in the direction (θ= 900, φ = 00), given a feed-point current of 1A.

1.  38.2 w/sr

2.  76.4 w/sr

3.  152.8 w/sr

4.   19.8 w/sr

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4
Correct Answer :

76.4 w/sr


Explanation :
No Explanation available for this question

A plane wave propagating through a medium [εr= 8, μr= 2 and σ = 0] has its electric field given bu = (0.5) âx. e-(z/3) sin (108 t-βz) v/m. The wave impedance in ohms is

1.  377

2.   198.5∠1800

3.  182.9∠140

4.  133.3

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4
Correct Answer :

377


Explanation :
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A lossless, air dielectric cylindrical wave guide of inside diameter 3cm, is operated at 14GHz. For the TM11 mode propagating in +z direction the wave impedance will be (for TM11 mode, Kc a = 3.832)

1.  120πΩ

2.  185Ω

3.  240πΩ

4.   95.25Ω

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4
Correct Answer :

185Ω


Explanation :
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The depth of penetration of a wave in a lossy dielectric increase with increasing

1.  Conductivity

2.   Permeability

3.   Wavelength

4.  Permittivity

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4
Correct Answer :

Wavelength


Explanation :
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The maximum usable frequency of an ionosheric layer at 600 incidence and with 8mHz critical frequency is

1.  16 MHz

2.  

3.  8MHz

4.  6.93MHz

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4
Correct Answer :

16 MHz


Explanation :
No Explanation available for this question

A very lossy, π/4 long, 50Ω transmission line is open circuited at the load end. The input impedance measured at the other end of the line is approximately

1.  0

2.  50Ω

3.  ∞

4.  None of the above

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4
Correct Answer :

0


Explanation :
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