1
GATE ECE 1992
Subjective
+8
-0
A uniform plane wave traveling in free space along the +$$z$$ direction and having its electric field along the$$ x$$-direction, is normally incident on a thick brass sheet, infinite in extent (along the $$x$$-and $$y$$-directions). The electric field intensity of the wave is given by $$${E_x} = 1225\,\cos \,\left( {5.89 \times {{10}^{10}}t - \beta z} \right)\,\,\,\,V/m$$$.

Calculate the power per square metre that causes heating of the brass sheet, taking $${ \in _r} = 1,\,\,\,{\mu _r} = 1$$ and $$\sigma = 1.649 \times {10^7}\,\,\,\,\,$$ mhos/metre for brass.

2
GATE ECE 1992
MCQ (Single Correct Answer)
+2
-0.6
Two dissimilar antennas having their maximum directivities equal
A
must have their beamwidths also equal
B
cannot have their beamwidths equal because they are dissimilar antennas
C
may not necessarily have their maximum power gains equal
D
must have their effective aperture areas (capture areas) also equal.
3
GATE ECE 1992
MCQ (Single Correct Answer)
+2
-0.6
The beam width-between-first-null of a uniform linear array of N equally-spaced (element spacing = d) equally-excited antennas is determined by
A
N alone and not by d
B
d alone and not by N
C
the ratio (N/d)
D
the product (Nd)
4
GATE ECE 1992
Subjective
+8
-0
Elements of a linear array of three equally spaced (element spacing $$0.5\lambda $$ ) vertical mast radiators are excited as given in Fig. For the horizontal plane radiation pattern of the array determine the direction of the major lobe (main lobe or principal lobe) and calculate its half-power-beam-width in degrees. GATE ECE 1992 Electromagnetics - Antennas Question 11 English
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