Two λ/2 dipole are arranged as shown in the figure. Antenna(A) is transmitting 300W at 300W at 300 MHz. open circuit voltage at terminal of antenna (2), will be

1.  0.35 V

2.  0.45 V

3.  0.55V

4.  0.65V

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4
Correct Answer :

0.45 V


Explanation :
No Explanation available for this question

Front to back ratio of an antenna which radiates 3k W in most optimum direction and 500 watts in opposite direction, will be

1.  5.78 db

2.  7.78db

3.  8.78 db

4.  6.78 db

View Answer  
4
Correct Answer :

7.78db


Explanation :
No Explanation available for this question

Magnetic field at r=λ/5, θ=300 when a Hertizian dipole of length λ/100 is located at origin and feed with a current of 0.25 sin 108t, will be

1.  -16.89 sin(108t+20.51) aφ mA/m

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

The directivity of an antenna radiating a power of 100W, so that field strength of 12 mV/m at 20 km, is

1.  2.34 db

2.  3.34 db

3.  4.34 db

4.  5.34 db

View Answer  
4
Correct Answer :

3.34 db


Explanation :
No Explanation available for this question

The directivity of an antenna having efficiency as 95% and maximum radiating intensity as 0.5 W/sv with input power as 0.4 ω,

1.  14.53

2.  10.53

3.  16.53

4.  17.53

View Answer  
4
Correct Answer :

16.53


Explanation :
No Explanation available for this question

Directivity of an antenna with normalized radiation intensity u(0,4)=sin0≤θ≤π/2, θ≤φ≤2π will be

1.  1.546

2.  2.546

3.  3.546

4.  4.546

View Answer  
4
Correct Answer :

2.546


Explanation :
No Explanation available for this question

What is the power received by a λ/2 dipole from another I dipole separated by 1 km and transmitting 80 W at operating frequency 100 MHz

1.  10.8µW

2.  11.8µW

3.  12.8 µW

4.  15.58 µW

View Answer  
4
Correct Answer :

12.8 µW


Explanation :
No Explanation available for this question

What is the directive gain of a Hertizian antenna. dipole at 0 = 400

1.  0.40

2.  0.52

3.  0.62

4.  0.72

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4
Correct Answer :

0.62


Explanation :
No Explanation available for this question

What . is the radiation efficiency of λ/80 Hertizian dipole, operating at 3 MHz, mode of copper of radius 1.024 mm loss resistance, R1=1/2πa Rs, where, a = radius of wire , l=length of wire, and Rs=skin resistance

1.  38%

2.  48%

3.  58%

4.  68%

View Answer  
4
Correct Answer :

58\%


Explanation :
No Explanation available for this question

What is the directive of an antenna whose normalized intensity is μ(θ, φ) = cos θ, 0≤θ≤π/2, θ≤φ≤2π

1.  1

2.  2

3.  3

4.  4

View Answer  
4
Correct Answer :

4


Explanation :
No Explanation available for this question
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