GATE ECE 2022 | Waveguides Question 2 | Electromagnetics

GATE ECE 2022

MCQ (More than One Correct Answer)

-0

A waveguide consists of two infinite parallel plates (perfect conductors) at a separation of 10^$$-$$4 cm, with air as the dielectric. Assume the speed of light in air to be 3 $$\times$$ 10⁸ m/s. The frequency/frequencies of TM waves which can propagate in this waveguide is/are ___________.

6 $$\times$$ 10¹⁵ Hz

0.5 $$\times$$ 10¹² Hz

8 $$\times$$ 10¹⁴ Hz

1 $$\times$$ 10¹³ Hz

GATE ECE 2021

Numerical

-0

A standard air-filled rectangular waveguide with dimensions $a=8 \mathrm{~cm}, b=4 \mathrm{~cm}$, operates at 3.4 GHz . For the dominant mode of wave propagation, the phase velocity of the signal is $v_p$. The value (rounded off to two decimal places) of $v_p / c$, where $c$ denotes the velocity of light, is $\_\_\_\_$ .

Your input ____

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

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

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

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

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

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