1
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
$$0.8$$
2
GATE ECE 2008
MCQ (Single Correct Answer)
+2
-0.6
A rectangular waveguide of internal dimensions (a = 4 cm and b = 3 cm ) is to be operated in $$T{E_{11}}$$ mode. The minimum operating frequency is
A
6.25 GHz
B
6.0 GHz
C
5.0 GHz
D
3.75 GHz
3
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
$${45^ \circ }$$
4
GATE ECE 2008
MCQ (Single Correct Answer)
+2
-0.6
At 20 GHz, the gain of a parabolic dish antenna of 1 meter diameter and 70% efficiency is
A
15 dB
B
25 dB
C
35 dB
D
45 dB
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