GATE ECE 2017 Set 2 | Waveguides Question 2 | Electromagnetics

GATE ECE 2017 Set 2

MCQ (Single Correct Answer)

-0.6

Standard air filled rectangular waveguides of dimensions a = 2.29cm and b = 1.02cm are designed for radar applications. It is desired that these waveguides operate only in the dominant $$T{E_{10}}$$ mode with the operating frequency at least 25% above the cut-off frequency of the $$T{E_{10}}$$ mode but not higher than 95% of the next higher cutoff frequency. The range of the allowable operating frequency f is

$$8.19\,\,GHz\,\, \le \,\,f\,\, \le \,\,13.1\,\,GHz$$

$$8.19\,\,GHz\,\, \le \,\,f\,\, \le \,\,12.45\,\,GHz$$

$$6.55\,\,GHz\,\, \le \,\,f\,\, \le \,\,13.1\,\,GHz$$

$$1.64\,\,GHz\,\, \le \,\,f\,\, \le \,\,10.24\,\,GHz$$

GATE ECE 2016 Set 3

Numerical

-0

Consider an air-filled rectangular waveguide with dimensions a = 2.286cm and b = 1.016cm. At 10GHz operating frequency, the value of the propagation constant (per meter) of the corresponding propagation mode is _____________________

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GATE ECE 2016 Set 3

MCQ (Single Correct Answer)

-0.6

Consider an air-filled rectangular waveguide with dimensions a = 2.286 cm and b = 1.016 cm. The increasing order of the cut-off frequencies for different modes is

$$T{E_{01}}\,\, < \,T{E_{10}}\, < \,T{E_{11}}\,\, < \,T{E_{20}}$$

$$T{E_{20}}\,\, < \,T{E_{11}}\, < \,T{E_{10}}\,\, < \,T{E_{01}}$$

$$T{E_{10}}\,\, < \,T{E_{20}}\, < \,T{E_{01}}\,\, < \,T{E_{11}}$$

$$T{E_{10}}\,\, < \,T{E_{11}}\, < \,T{E_{20}}\,\, < \,T{E_{01}}$$

GATE ECE 2015 Set 2

Numerical

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An air-filled rectangular waveguide of internal dimension $$a\,\,cm\,\, \times \,\,b\,\,cm$$ (a > b) has a cutoff frequency of 6 GHz for the dominant $$T{E_{10}}$$ mode. For the same waveguide, if the cutoff frequency of the $$T{E_{11}}$$ mode is 15 GHz, the cutoff frequency of the $$T{E_{01}}$$ mode in GHz is _____________

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