1
GATE ECE 2000
MCQ (Single Correct Answer)
+1
-0.3
A TEM wave is incident normally upon a perfect conductor. The E and H fields at the boundary will be respectively
A
minimum and minimum
B
maximum and maximum
C
minimum and maximum
D
maximum and minimum
2
GATE ECE 2000
MCQ (Single Correct Answer)
+1
-0.3
The magnitudes of the open-circuit and short-circuit input impedances of a transmission line are 100$$\Omega \,$$ and 25$$\Omega \,$$ respectively. The characteristic impedance of the line is
A
25 $$\Omega \,$$
B
50 $$\Omega \,$$
C
75 $$\Omega \,$$
D
100 $$\Omega \,$$
3
GATE ECE 2000
MCQ (Single Correct Answer)
+2
-0.6
A uniform plane wave in air impinges at 45° angle on a lossless dielectric material with dielectric constant $${\varepsilon _r}$$. The transmitted wave propagates in a 30° direction with respect to the normal. The value of $${\varepsilon _r}$$ is
A
$$1.5 $$
B
$$\sqrt {1.5} $$
C
$$2$$
D
$$\sqrt {2} $$
4
GATE ECE 2000
Subjective
+5
-0
The three regions shown in Fig. are all lossless and non-magnetic. Find

(a) Wave impedance in mediums 2 and 3.
(b) d such that medium 2 acts as a quarter wave $$(\lambda /40$$)transformer.
(c) Reflection coefficient $$(\Gamma )$$ and voltage standing wave ratio (VSWR) at the interface of the medium 1 and 2, when $$d = \lambda /4$$.

GATE ECE 2000 Electromagnetics - Transmission Lines Question 7 English
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