1
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 __________________
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2
GATE ECE 2011
MCQ (Single Correct Answer)
+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.
3
GATE ECE 2009
MCQ (Single Correct Answer)
+1
-0.3
Which of the following statements is true regarding the fundamental mode of the metallic waveguides shown? GATE ECE 2009 Electromagnetics - Waveguides Question 36 English
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
4
GATE ECE 2004
MCQ (Single Correct Answer)
+1
-0.3
The phase velocity of an electromagnetic wave propagating in a hollow metallic rectangular waveguide in the $$T{E_{10}}$$ mode is
A
equal to its group velocity
B
less than the velocity of light in free space
C
equal to the velocity of light in free space
D
greater than the velocity of light in free space
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