1
GATE ECE 2022
MCQ (More than One Correct Answer)
+1
-0.33

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 ___________.

A
6 $$\times$$ 1015 Hz
B
0.5 $$\times$$ 1012 Hz
C
8 $$\times$$ 1014 Hz
D
1 $$\times$$ 1013 Hz
2
GATE ECE 2014 Set 3
Numerical
+1
-0
Consider an air filled rectangular waveguide with a cross-section of $$5\,\,cm\,\, \times \,\,3\,cm$$. For this waveguide, the cut-off frequency (in MHz) of $$T{E_{21}}\,$$ mode is __________________
3
GATE ECE 2011
+1
-0.3
The modes in a rectangular waveguide are denoted by $$T{E_{mn}}\,$$/$$T{M_{mn}}\,$$ where m and n are the eigen numbers along the larger and smaller dimensions of the waveguide respectively. Which one of the following satements is TRUE?
A
The $$T{M_{10}}\,$$ mode of the waveguide does not exist
B
The $$T{E_{10}}\,$$ mode of the waveguide does not exist
C
The $$T{M_{10}}\,$$ and the $$T{E_{10}}\,$$ modes both exist and have the same cut-off frequencies
D
The $$T{M_{10}}\,$$ and the $$T{M_{01}}\,$$ modes both exist and have the same cut-off frequencies.
4
GATE ECE 2009
+1
-0.3
Which of the following statements is true regarding the fundamental mode of the metallic waveguides shown?
A
Only P has no cutoff- frequency
B
Only Q has no cutoff-frequency
C
Only R has no cutoff-frequency
D
All three have cutoff-frequencies
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