1
GATE ECE 1998
MCQ (Single Correct Answer)
+1
-0.3
An antenna in free space receives 2$$\mu$$ W of power when the incident electric field is 20 m V/m rms. The effective aperture of the antenna is
A
0.005 $${m^2}$$
B
0.05 $${m^2}$$
C
1.885 $${m^2}$$
D
3.77 $${m^2}$$
2
GATE ECE 1998
MCQ (Single Correct Answer)
+1
-0.3
The radiation resistance of a circular loop of one turn is 0.01 $$\Omega$$. The radiation resistance of five turns of such a loop will be
A
0.002 $$\Omega$$
B
0.01 $$\Omega$$
C
0.05 $$\Omega$$
D
0.25 $$\Omega$$
3
GATE ECE 1998
MCQ (Single Correct Answer)
+1
-0.3
The far field of an antenna varies with distance r as
A
1/r
B
1 / $${r^2}$$
C
1 / $${r^3}$$
D
$${1 \over {\sqrt r }}$$
4
GATE ECE 1998
MCQ (Single Correct Answer)
+1
-0.3
The vector $$\mathop H\limits^ \to$$ in the far field of an antenna satisfiels
A
$$\nabla .\,\mathop H\limits^ \to = 0\,\,and\,\,\nabla \times \,\mathop H\limits^ \to = 0\,$$
B
$$\nabla .\,\mathop H\limits^ \to \ne 0\,\,and\,\,\nabla \times \,\mathop H\limits^ \to \ne 0$$
C
$$\nabla .\,\mathop H\limits^ \to = 0\,\,and\,\,\nabla \times \,\mathop H\limits^ \to \ne 0\,\,$$
D
$$\nabla .\,\mathop H\limits^ \to \ne 0\,\,and\,\,\nabla \times \,\mathop H\limits^ \to = 0\,\,$$
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