1
GATE ECE 2002
MCQ (Single Correct Answer)
+2
-0.6
A plane wave is characterized by $$$\overrightarrow E = \left( {0.5\mathop x\limits^ \cap + \mathop y\limits^ \cap \,{e^{j\pi /2}}} \right){e^{j\omega t - jkz}}.$$$

This wave is

A
linearly polarized
B
circularly polarized
C
elliptically polarized
D
un polarized
2
GATE ECE 2002
MCQ (Single Correct Answer)
+2
-0.6
Distilled water at $${25^ \circ }C$$ is characterized by $$\sigma = 1.7 \times {10^{ - 4}}$$ mho/m and $$ \in = 78{ \in _0}$$ at a frequency of $$3 GHz$$. Its loss tangent $$\tan \delta $$ is
A
$$1.3 \times {10^{ - 5}}$$
B
$$1.3 \times {10^{ - 3}}$$
C
$$1.7 \times {10^{ - 4}}/78$$
D
$$1.7 \times {10^{ - 4}}\left( {78{ \in _0}} \right)$$
3
GATE ECE 2001
MCQ (Single Correct Answer)
+2
-0.6
A uniform plane electromagnetic wave incident normally on a plane surface of a dielectric material is reflected with a VSWR of 3. What is the percentage of incident power that is reflected?
A
10%
B
25%
C
50%
D
75%
4
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
$$\sqrt {2} $$
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