1
GATE ECE 2003
MCQ (Single Correct Answer)
+2
-0.6
If the electric field intensity associated with a uniform plane electromagnetic wave traveling in a perfect dielectric medium is given by

$$E\left( {z,\,t} \right) = \,10\,\cos \left( {2\pi \times {{10}^7}\,\,t - 0.1\,\,\pi z} \right)\,$$ volt/m, the velocity of the traveling wave is

A
$$3.00 \times {10^8}\,\,$$ m/sec
B
$$2.00 \times {10^8}\,\,$$ m/sec
C
$$6.28 \times {10^7}\,\,$$ m/sec
D
$$2.00 \times {10^7}\,\,$$ m/sec
2
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
3
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
$$1.7 \times {10^{ - 4}}\left( {78{ \in _0}} \right)$$
4
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%
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