1
GATE ECE 2006
+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
2
GATE ECE 2005
+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
3
GATE ECE 2004
+1
-0.3
Consider a lossless antenna with a directive gain of + 6 dB. If 1 m W of power is fed to it the total power radiated by the antenna will be
A
4 m W
B
1 m W
C
7 m W
D
1/4 m W
4
GATE ECE 2002
+1
-0.3
The line-of-sight communication requires the transmit and receive antennas to face each other. If the transmit antenna is vertically polarized for best reception the receiver antenna should be
A
horizontally polarized
B
vertically polarized
C
at $${45^ \circ }$$ with respect to horizontal polarization
D
at $${45^ \circ }$$ with respect to vertical polarization
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