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Electromagnetics
Waveguides
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Antennas
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Miscellaneous
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Transmission Lines
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Maxwell Equations
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Uniform Plane Waves
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1
GATE ECE 2000
MCQ (Single Correct Answer)
+2
-0.6
A rectangular waveguide has dimensions $$1\,\,cm\,\, \times \,\,0.5\,\,cm$$. Its cut-off frequency is
A
5 GHz
B
10 GHz
C
15 GHz
D
20 GHz
2
GATE ECE 1993
MCQ (Single Correct Answer)
+2
-0.6
An optical fiber consists of a cylindrical dielectric rod of refractive index $$n_1$$, surrounded by another dielectric of refractive index $$n_2$$ where $$n_2$$ < $$n_1$$ as shown in the following Fig. If a ray is incident from air at angle i to the axis, then it undergoes total internal reflection at the interface AB if GATE ECE 1993 Electromagnetics - Waveguides Question 13 English
A
$$i\,\, \ge \,\,{\sin ^{ - 1}}\,\sqrt {{n_1}^2 - {n_2}^2} $$
B
$$i\,\, < \,\,{\sin ^{ - 1}}\,\sqrt {{n_1} - {n_2}} $$
C
$$i\,\, \le \,\,{\sin ^{ - 1}}\,\sqrt {{n_1}^2 - {n_2}^2} $$
D
$$i\,\, = \,\,{\sin ^{ - 1}}\,\sqrt {{n_1} - {n_2}} $$
3
GATE ECE 1990
MCQ (More than One Correct Answer)
+2
-0
Choose the correct statements.
For a wave propagating in an air filled rectangular wave guide
A
Guided wavelength is never less than the free space wavelength
B
Wave impedance is never less than the free space impedance.
C
Phase velocity is never less than the free space velocity
D
TEM mode is possible if the dimensions of the wave guide are properly chosen.
4
GATE ECE 1988
MCQ (More than One Correct Answer)
+2
-0
For a normal mode EM wave propagating in a hollow rectangular wave guide
A
the phase velocity is greater than the group velocity
B
the phase velocity is greater than velocity of light in free space
C
the phase velocity is less than the velocity of light in free space
D
the phase velocity may be either greater than or less than the group velocity
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Questions Asked from Marks 2
GATE ECE 2022 (1) GATE ECE 2017 Set 2 (1) GATE ECE 2016 Set 3 (2) GATE ECE 2015 Set 2 (1) GATE ECE 2015 Set 1 (1) GATE ECE 2014 Set 2 (1) GATE ECE 2012 (1) GATE ECE 2008 (1) GATE ECE 2007 (2) GATE ECE 2006 (1) GATE ECE 2005 (1) GATE ECE 2003 (1) GATE ECE 2000 (1) GATE ECE 1993 (1) GATE ECE 1990 (1) GATE ECE 1988 (1) GATE ECE 1987 (1)
GATE ECE Subjects
Signals and Systems
Network Theory
Control Systems
Digital Circuits
General Aptitude
Electronic Devices and VLSI
Analog Circuits
Engineering Mathematics
Microprocessors
Communications
Electromagnetics