The range of frequencies, over which is single mode operation will occur is

1.  2.24GHz

2.  2GHz

3.  4.48GHz

4.  4GHz

View Answer  
4
Correct Answer :

2.24GHz<f<3.33 GHz


Explanation :
No Explanation available for this question

The range of frequencies, over which guide support both TE10 and TE01 modes and no other is

1.  3.35GHz

2.  2.5GHz

3.  3GHz

4.  2.5GHz

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4
Correct Answer :

3GHz<f<3.6 GHz


Explanation :
No Explanation available for this question

The air filled cavity resonator has dimension a=3cm, b=2 cm, c=4cm. the resonant frequency for the TM110 mode is

1.  5 GHz

2.  6.4 GHz

3.  16.2 GHz

4.  9 GHz

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4
Correct Answer :

9 GHz


Explanation :
No Explanation available for this question

A parabolic reflector is designed to have a directivity of 30 dB at 300 MHz. If aperature efficiency is 55% then half-power band width

1.  4.30

2.  8.620

3.  17.240

4.  none of these

View Answer  
4
Correct Answer :

8.620


Explanation :
No Explanation available for this question

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

1.  38.2W/sr

2.  76.4-W/sr

3.  152.8 W/sr

4.  19.8w/sr

View Answer  
4
Correct Answer :

76.4-W/sr


Explanation :
No Explanation available for this question

A short grounded vertical antenna has a length l which is 0.05 λ at frequency . If its radiation resistance at f is Rohms, then radiation resistance at a frequency 2f will be

1.  2 ohms

2.  R ohms

3.  2R ohms

4.  4R ohms

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4
Correct Answer :

4R ohms


Explanation :
No Explanation available for this question

Two isotropic radiators A and B are placed along the X-axis at the positions γ/8 and +γ/8 respectively. The elements arc fed by currents of equal amplitude with the phase of B leading that of A by 900. The array pattern will have maxima

1.  in the direction of the +X axis

2.  an angle of 450 with respect to the +X axis

3.  in the direction of + Y axis

4.  in the direction -X axis

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4
Correct Answer :

in the direction -X axis


Explanation :
No Explanation available for this question

Magnitude of the incident electric field intensity of the object is

1.  1.82 V/m

2.  2.46V/m

3.  0.84 V/m

4.  0.17V/m

View Answer  
4
Correct Answer :

1.82 V/m


Explanation :
No Explanation available for this question

Two isotropic antennas are separated by a distance of two wavelength. If both the antennas are fed with currents of equal phase and magnitude, the number of lobes in radiation pattern in the horizontal plane are

1.  2

2.  4

3.  6

4.  8

View Answer  
4
Correct Answer :

4


Explanation :
No Explanation available for this question

Two dissimilar antennas having their maximum directivities equal,

1.  must have their beam widths also equal

2.  cannot have their beam widths equal  because they are dissimilar antennas.

3.  may not necessarily have their maximum power gains equal.

4.   must have their effective aperture areas (capture areas) also equal

View Answer  
4
Correct Answer :

may not necessarily have their maximum power gains equal.


Explanation :
No Explanation available for this question
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