1
GATE ECE 2008
MCQ (Single Correct Answer)
+2
-0.6
A rectangular waveguide of internal dimensions (a = 4 cm and b = 3 cm ) is to be operated in $$T{E_{11}}$$ mode. The minimum operating frequency is
A
6.25 GHz
B
6.0 GHz
C
5.0 GHz
D
3.75 GHz
2
GATE ECE 2007
MCQ (Single Correct Answer)
+2
-0.6
An air-filled rectangular waveguide has inner dimensions of $$3\,cm\,\, \times \,\,2\,\,cm\,$$. The wave impedance of the $$T{E_{20}}$$ mode of propagation in the waveguide at a frequency of 30 GHz is (free space impedance $$\,{\eta _0} = \,377\,\,\Omega $$)
A
308 $$\Omega $$
B
355 $$\Omega $$
C
400 $$\Omega $$
D
461 $$\Omega $$
3
GATE ECE 2007
MCQ (Single Correct Answer)
+2
-0.6
The $$\mathop E\limits^ \to $$ field in a rectangular waveguide of inner dimensions $$a\,\, \times \,\,b$$ is given by $$\mathop E\limits^ \to = {{\omega \,\mu } \over {{h^2}}}\,\left( {{\pi \over a}} \right)\,{H_0}\,\sin \,\left( {{{2\,\pi \,x} \over a}} \right)\,\,\sin \,(\omega \,t - \,\beta \,z)\hat y$$,

where $${H_0}$$ is a constant, a and b are the dimensions along the x-axis and the y-axis respectively. The mode of propagation in the waveguide is

A
$$T{E_{20}}$$
B
$$T{M_{11}}$$
C
$$T{M_{20}}$$
D
$$T{E_{10}}$$
4
GATE ECE 2006
MCQ (Single Correct Answer)
+2
-0.6
A rectangular waveguide having $$T{E_{10}}$$ mode as dominant mode is having a cutoff frequency of 18 GHz for the $$T{E_{30}}$$ mode. The inner broad-wall dimension of the rectangular waveguide is
A
5/3 cms
B
5 cms
C
5/2 cms
D
10 cms
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