1
GATE ECE 2012
MCQ (Single Correct Answer)
+1
-0.3
The radiation pattern of an antenna in spherical co-ordinates is given by $$$F\,(\theta )\, = {\cos ^4}\,\theta \,\,\,;\,\,0\,\, \le \,\,\theta \,\, \le \,\,\pi /2$$$ The directivity of the antenna is
A
10 dB
B
12.6 dB
C
11.5 dB
D
18 dB
2
GATE ECE 2008
MCQ (Single Correct Answer)
+1
-0.3
For a Hertz dipole antenna, the half power beam width (HPBW) in the E-plane is
A
$${360^ \circ }$$
B
$${180^ \circ }$$
C
$${90^ \circ }$$
D
$${45^ \circ }$$
3
GATE ECE 2006
MCQ (Single Correct Answer)
+1
-0.3
A transmission line is feeding 1 Watt of power to a horn antenna having gain of 10 dB. The antenna is matched to the transmission line. The total power radiated by the horn antenna into the free-space is
A
10 Watts
B
1 Watt
C
0.1 Watt
D
0.01 Watt
4
GATE ECE 2005
MCQ (Single Correct Answer)
+1
-0.3
Refractive index of glass is 1.5. Find the wavelength of a beam of light with a frequency of $${10^{14}}$$ Hz in glass. Assume velocity of light is $$3\,\, \times \,{10^8}$$ m/s in vacuum.
A
3 $$\mu $$m
B
3mm
C
2 $$\mu $$m
D
1 $$\mu $$m
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