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Electromagnetic Field Theory problems
1. Consider a loss less antenna with a directive gain of + 6 dB. If 1 mW of power is fed to it the total power radiated by the antenna will be
Options
A. 4 mW
B. 1 mW
C. 7 mW
D. 1/4 mW
Show Answer
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Discuss
Correct Answer: 4 mW
Explanation:
6 dB = 10 log
10
⟹
= 10
0.6
⟹ 3.98
P
r
= 3.98 mW.
2. Find the radiation resistance of an antenna of length ?/10 meter?
Options
A. 8 ?
B. 780 ?
C. 7.8 ?
D. 78 ?
Show Answer
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Discuss
Correct Answer: 7.8 ?
Explanation:
.
3. A transmission line is feeding 1 watt of power to a horn antenna having a gain of 10 dB. The antenna is matched to the transmission line. The total power radiated by the horn antenna into the free space is
Options
A. 10 watts
B. 1 watt
C. 0.1 watt
D. 0.01 watt
Show Answer
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Discuss
Correct Answer: 10 watts
Explanation:
= 10
1
⟹ P
r
= 10 watt.
4. The radiation resistance of a ?/16 wire dipole in free space will be nearly
Options
A. 1 ?
B. 3 ?
C. 13 ?
D. 30 ?
Show Answer
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Discuss
Correct Answer: 3 ?
Explanation:
R
r
= 80
p
2
.
5. In a conductor which of the following relations hold good?
Options
A. ? x D =
r
B. ? . D =
r
C. ? x D = 0
D. ? . D = 0
Show Answer
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Discuss
Correct Answer: ? x D = 0
Explanation:
Inside a conductor free charge is zero, hence, ? x D = 0.
6. A rectangular waveguide measures 3 x 4.5 cm internally and has a 10 GHz signal propagated in it. Calculate the wave impedance for dominant mode.
Options
A. 130
p
B. 1.3
p
C. 120
p
D. 12
p
Show Answer
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Discuss
Correct Answer: 1.3
p
Explanation:
Wave impedance
.
7. A uniform plane wave is one in which
Options
A.
x
= 0
B.
.
C.
and
are perpendicular
D.
and
lie in a plane
Show Answer
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Discuss
Correct Answer:
and
lie in a plane
Explanation:
For uniform plane wave, E and H must be in a plane but perpendicular to each other.
8. The function
f
(
x
-
v
ot
) represent which of the following?
Options
A. A stationary wave
B. A wave motion in forward direction
C. A wave motion in reverse direction
D. None of the above
Show Answer
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Discuss
Correct Answer: A wave motion in forward direction
Explanation:
f
(
x
-
v
ot
) represents in +ve direction while
f
(
x
+
v
ot
) represents a progressive wave in -ve direction.
First
2
3
4
5
More in Electronics and Communication Engineering:
Analog Electronics
Automatic Control Systems
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Electromagnetic Field Theory
Electronic Devices and Circuits
Exam Questions Papers
Matching Questions
Materials and Components
Measurements and Instrumentation
Microprocessors
Microwave Communication
Networks Analysis and Synthesis
Power Electronics
Radio Receivers
Satellite Communication
Signals and Systems
.
.
.
x 
= 0