1
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
$$\sqrt {2} $$
2
GATE ECE 1996
MCQ (Single Correct Answer)
+2
-0.6
A uniform plane wave in air is normally incident on an infinitely thick slab. If the reflective index of the glass slab is 1.5, then the percentage of the incident power that is reflected from the air-glass interface is
A
0%
B
4%
C
20%
D
100%
3
GATE ECE 1996
MCQ (Single Correct Answer)
+2
-0.6
Some unknown material has a conductivity of $${10^{ 6}}$$ $$mho/m$$ and a permeability of $$4\pi \times {10^{ - 7}}\,\,\,\,\,H/m.$$ The skin depth for the material at $$1GHz$$ is
A
$$15.9\,\,\,\mu m$$
B
$$20.9\,\,\,\mu m$$
C
$$25.9\,\,\,\mu m$$
D
$$30.9\,\,\,\mu m$$
4
GATE ECE 1993
MCQ (Single Correct Answer)
+2
-0.6
A material is described by the following electrical parameters at a frequency of $$10$$ GHz is $$\sigma = {10^6}$$ mho/m, $$\mu = {\mu _0},$$ and $$ \in /{ \in _0} = 10.$$ The material at this frequency is considered to be $$\left( {{ \in _0} = {1 \over {36\,\,\pi }} \times {{10}^{ - 9}}\,\,F/m} \right)$$
A
a good conductor
B
a good dielectric
C
neither a good conductor nor a good dielectric
D
a good magnetic material
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