Electromagnetic Theory MCQ Questions Answers Electronics Engineering

Electromagnetic Theory ECE Electronics Engineering MCQ Questions Answers

1) A cavity is a

a) los-pass filter

b) high-pass filter

c) band-pass filter

d) band-stop filter

View Answer
Option – c)

2) In H-plane metal plate lens the travelling wave front is

A. totally retarded

B. retarded

C. accelerated

D. neither accelerated nor retarded

View Answer
Option – b)

3)When the phase velocity of an electromagnetic wave depends on frequency in any medium, the phenomenon is called

a) scattering

b) polarization

c) absorption

d) dispersion

View Answer
Option – b)

4) Which of the following will increase the antenna radiation efficiency?
A. Use of larger section of conductor
B. Providing insulation on conductor
C. Top loading of antenna
D. Any of the above

View Answer
Option – c)

5) When VSWR IS 3, the magnitude of the reflection coefficient will be

a) ¼

b) 1/3

c) ½

d) 1

View Answer
Option – c)

6) Tropospheric scatter is used with frequencies in the

View Answer
Option – c)

7) The poynting vector P = E x H has the dimensions of

a) power/unit area

b) Volts

c) Power

d) Volt/ unit length

View Answer
Option – a)

8) In a perfect conductor the incident and reflected wave combine to produce
A. a stronger incident wave
B. a stronger reflected wave
C. a standing wave which is not progressing
D. none of the above

View Answer
Option – c)

9) The radiation field of an antenna at a distance r varies as

a) 1/r

b) 1/r2

c) 1/r3

d) 1/r4

View Answer
Option – a)

10) The wave radiated by a helical antenna is

a) linearly polarized

b) right circularly polarized

c) left circularly polarized

d) elliptically polarized

View Answer
Option – d)
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