1
GATE ECE 2011
MCQ (Single Correct Answer)
+2
-0.6
The electric and magnetic fields for a TEM wave of frequency $$14 GHz$$ in a homogeneous medium of relative permittivity $${\varepsilon _r}$$ and relative permeability $${\mu _r} = 1$$ are given by $$$\overrightarrow E = {E_p}\,\,{e^{j\left( {\omega t - 280\pi y} \right)}}\,\,{\widehat u_z}\,\,V/m$$$ $$$\overrightarrow H = \,\,3\,\,{e^{j\left( {\omega \,t - 280\,\,\pi \,y} \right)}}\,\,\widehat u{\,_x}\,\,A/m$$$

Assuming the speed of light in free space to be $$3\,\, \times {10^8}\,\,\,m/s,$$ the intrinsic impedance of free space to be $$120\,\,\,\pi $$, the relative permittivity $${\varepsilon _r}$$ of the medium and the electric field amplitude $${E_p}$$ are

A
$${\varepsilon _r} = 3,\,\,{E_p} = 120\,\pi $$
B
$${\varepsilon _r} = 3,\,\,{E_p} = 360\,\pi $$
C
$${\varepsilon _r} = 9,\,\,{E_p} = 360\,\pi $$
D
$${\varepsilon _r} = 9,\,\,{E_p} = 120\,\pi $$
2
GATE ECE 2010
MCQ (Single Correct Answer)
+2
-0.6
A plane wave having the electric field component $$${\overrightarrow E _i} = 24\,\,\cos \,\,\left( {3 \times {{10}^8}\,t - \beta \,y} \right){\widehat a_z}\,\,V/m$$$
and traveling in free space is incident normally on a lossless medium with $$\mu = {\mu _0}$$ and $$\varepsilon = 9\,\,{\varepsilon _0},$$ which occupies the region $$y \ge 0.$$ The reflected magnetic field component is given by
A
$${1 \over {10{\mkern 1mu} \pi }}\cos {\mkern 1mu} {\mkern 1mu} \left( {3 \times {{10}^8}{\mkern 1mu} t - y} \right)\hat a{\,_x}{\mkern 1mu} {\mkern 1mu} A/m$$
B
$${1 \over {20{\mkern 1mu} \pi }}\cos {\mkern 1mu} {\mkern 1mu} \left( {3 \times {{10}^8}{\mkern 1mu} t - y} \right)\hat a{\,_x}{\mkern 1mu} {\mkern 1mu} A/m$$
C
$$ - {1 \over {20{\mkern 1mu} \pi }}\cos {\mkern 1mu} {\mkern 1mu} \left( {3 \times {{10}^8}{\mkern 1mu} t - y} \right)\hat a{\,_x}{\mkern 1mu} {\mkern 1mu} A/m$$
D
$$ - {1 \over {10{\mkern 1mu} \pi }}\cos {\mkern 1mu} {\mkern 1mu} \left( {3 \times {{10}^8}{\mkern 1mu} t - y} \right)\hat a{\,_x}{\mkern 1mu} {\mkern 1mu} A/m$$
3
GATE ECE 2008
MCQ (Single Correct Answer)
+2
-0.6
A uniform plane wave in the free space is normally incident on an infinitely thick dielectric slab (dielectric constant $${\varepsilon _r} = 9$$ ). The magnitude of the reflection coefficient is
A
$$0$$
B
$$0.3$$
C
$$0.5$$
D
$$0.8$$
4
GATE ECE 2007
MCQ (Single Correct Answer)
+2
-0.6
The $$\overrightarrow H $$ field (in A/m) of a plane wave propagating in free space is given by $$$\overrightarrow H = \widehat x{{5\sqrt 3 } \over {{\eta _0}}}\cos \left( {\omega \,t - \beta \,z} \right) + \widehat y{5 \over {{\eta _0}}}\sin \left( {\omega \,t - \beta \,z + {\pi \over 2}} \right)$$$

The time average power flow density in Watts is

A
$${{{\eta _0}} \over {100}}$$
B
$${{100} \over {{\eta _0}}}$$
C
$$50\,{\eta _0}^2$$
D
$${{50} \over {{\eta _0}}}$$
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