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1
GATE ECE 1991
MCQ (More than One Correct Answer)
+2
-0
The electric field component of a uniform plane electromagnetic wave propagating in the $$Y$$-direction in a lossless medium will satisfy the equation
A
$${{{\partial ^2}{E_y}} \over {\partial \,{y^2}}} = \mu \in {{{\partial ^2}{E_y}} \over {\partial \,{t^2}}}$$
B
$${{{\partial ^2}{E_y}} \over {\partial \,{x^2}}} = \mu \in {{{\partial ^2}{E_y}} \over {\partial \,{t^2}}}$$
C
$${{{\partial ^2}{E_x}} \over {\partial \,{y^2}}} = \mu \in {{{\partial ^2}{E_x}} \over {\partial \,{t^2}}}$$
D
$${{\sqrt {E_x^2 + E_z^2} } \over {\sqrt {H_x^2 + H_z^2} }} = \sqrt {\mu / \in } $$
2
GATE ECE 1989
MCQ (Single Correct Answer)
+2
-0.6
The skin - depth of copper at a frequency of $$3 GHz$$ is $$1$$ micron ($${{{10}^{ - 6}}}$$ metre). At $$12 GHz$$, for a non - magnetic conductor whose conductivity is $$1/9$$ times that of copper, the skin $$-$$ depth would be
A
$$\sqrt {9 \times 4} $$ microns
B
$$\sqrt {9/4} \,\,$$ microns
C
$$\sqrt {4/9} \,\,$$ microns
D
$${1 \over {\sqrt {9 \times 4} }}\,$$ microns
3
GATE ECE 1988
MCQ (Single Correct Answer)
+2
-0.6
In a good conductor the phase relation between the tangential components of electric field Et and the magnetic field Ht is as follows
A
Et and Ht are in phase
B
Et and Ht are out of phase
C
Ht leads Et by 900
D
Et leads Ht by 450
4
GATE ECE 1987
MCQ (Single Correct Answer)
+2
-0.6
For an electromagnetic wave incident from one medium to a second medium, total reflection takes place when
A
The angle of incidence is equal to the Brewster angle with E field perpendicular to the plane of incidence.
B
The angle of incidence is equal to the Brewster angle with E field parallel to the plane of incidence.
C
The angle of incidence is equal to the critical angle with the wave moving from the denser medium to a rarer medium.
D
The angle of incidence is equal to the critical angle with the wave moving from a rarer medium to a denser medium.
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