Cut-off wavelength λC for TE20 mode for a standard rectangular waveguide

1.  2/a

2.  2a

3.  a

4.  2a2

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4
Correct Answer :

a


Explanation :
No Explanation available for this question

If narrow dimension of a standard rectangular waveguide carrying the dominant mode is reduced, then

1.  wave impedance will increase

2.  ttenuation increase

3.  guide wavelength will decrease

4.  power handling capability will decrease

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4
Correct Answer :

wave impedance will increase


Explanation :
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If in an air line, adjacent maxima are found at 12.5 cm and 37.5 cm, then operating frequency is

1.  1.5GHz

2.  600 MHz

3.  300MHz

4.  1.2 GHz

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4
Correct Answer :

600 MHz


Explanation :
No Explanation available for this question

For the dominant mode, in a rectangular waveguide with breadth 10 cm, the guide wavelength for a signal of 2-5 GHz will be

1.  12 cm

2.  16 cm

3.  18 cm

4.  20 cm

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4
Correct Answer :

16 cm


Explanation :
No Explanation available for this question

The degenerate mod. in a waveguide are characterised by

1.  same cut off frequencies but different field distributions

2.  same cut-off frequencies and same field distributions

3.  different cut-off frequencies but same field distributions

4.  different cut-off frequencies and different field distributions

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4
Correct Answer :

same cut off frequencies but different field distributions


Explanation :
No Explanation available for this question

Guide wavelength (λg),cut-off wavelength (λ0) and free-space wavelength (λ0) of a waveguide are related as ,

1.  1/ λg2=1/ λ02-1/ λc2

2.  1/ λ02=1/ λg2-1/ λc2

3.  1/ λc2=1/ λ02-1/ λg2

4.  1/ λg2=1/ λ02-1/ λc2

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4
Correct Answer :

1/ λc2=1/ λ02-1/ λg2


Explanation :
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For rectangular waveguide (ax b, a>b) to support only the TE10 mode at wave length λ winch one of the following pairs of inequalities is to be satisfied

1.  b

2.  b

3.  a

4.  a

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4
Correct Answer :

a<λ<2b;λ<2a


Explanation :
No Explanation available for this question

In a hollow rectangular waveguide, the phase velocity

1.  increases with increasing frequency

2.  decreases with increasing frequency

3.  is independent of frequency

4.  will vary with frequency depending upon the frequency rang

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4
Correct Answer :

decreases with increasing frequency


Explanation :
No Explanation available for this question

A dominant mode waveguide, not terminated in its characteristic impedance, is excited with a 10 GHz signal. If ‘d’ is the distance between two successive minima of the standing wave in the guide, then

1.  d=1.5cm

2.  d is less than 1.5 cm

3.  d is greater than 1.5 cm

4.  d = 3 cm

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4
Correct Answer :

d is less than 1.5 cm


Explanation :
No Explanation available for this question

A circular filled waveguide of radius 5.cm is operated in the TH01 mode. The waveguide then completely filled with a dielectric of relative permittivity 2.25 and relative permeability 1.0. The cut-off wavelength for the TH01, mode is 0.082 m when the waveguide is air-fired. When the waveguide is filled with the &electric, the cut-off frequency will become nearly

1.  1.06GHz

2.  2-44GHz

3.  3-66GHz

4.  4.00GHz

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4
Correct Answer :

2-44GHz


Explanation :
No Explanation available for this question
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