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Unit 9 - Week 7
Lectures
Register for
Certification exam Assignment 7
The due date for submitting this assignment has passed.
Course As per our records you have not submitted this Due on 2019-04-17, 23:59 IST.
outline
assignment.
How to access 1) Suppose we wish to use a standard car radio antenna (length = 1m) as a transmitting antenna 1 point
the portal at 1 MHZ. The power to be transmitted is 10 W.
Use the above information for solving questions 1 and 2
−3
Assignment 0 If the antenna has a resistance of 2 × 10 Ω, the efficiency is_______
Week 1 Lectures 81.4%
Week 2 Lectures 40.7%
100%
Week 3 Lectures
20.3%
Week 4 Lectures No, the answer is incorrect.
Score: 0
Week 5 Lectures
Accepted Answers:
Week 6 Lectures 81.4%
2) The gain of antenna is ___________. 0 points
Week 7 Lectures
1.425
Linear
antenna-I 2.85
Linear 5
antenna-II &
Properties of 0
Transmitting
and Receiving No, the answer is incorrect.
Antenna Score: 0
Friis Accepted Answers:
Transmission 1.425
Formula
3) An antenna when radiating has a highly directional radiation pattern. When the antenna is 1 point
Antenna Array receiving its radiation pattern___________.
Wireless
Channel has same directivity
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A project
Quizof : is more directive In association with
Assignment 7
is less directive
Assignment 7
exhibits no directivity at all
Solution Funded by
No, the answer is incorrect.
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Electromagnetic Waves in Guided and Wireless... https://onlinecourses-archive.nptel.ac.in/noc19_...
Score: 0 Powered by
Week 8 Lectures
Accepted Answers:
has same directivity
4) Consider a lossless antenna with a directive gain of 6 dB. If 1 mW of power is fed to it, the 1 point
total power radiated by the antenna will be_______
1 mW
4 mW
7 mW
1/4 mW
No, the answer is incorrect.
Score: 0
Accepted Answers:
4 mW
5) The transmitting and receiving antennas are separated by a distance of 200λ and have 1 point
directive gains of 25 and 18 dB, respectively. If 5 mW of power is to be received, calculate the
minimum transmitted power.
0.791 W
1.583 W
3.166 W
1.258 W
No, the answer is incorrect.
Score: 0
Accepted Answers:
1.583 W
6) A magnetic field strength of 5 μA/m is required at a point on θ 1 point
=π/2, 2 km from an antenna in the air. Answer question 6-8
Neglecting ohmic loss, how much power must the antenna transmit if
it is a Hertzian dipole of length λ/25?
158 mW
144 mW
72 mW
36 mW
No, the answer is incorrect.
Score: 0
Accepted Answers:
158 mW
7) Neglecting ohmic loss, how much power must the antenna transmit if it is a half wave 1 point
dipole?
158 mW
144 mW
72 mW
36 mW
No, the answer is incorrect.
Score: 0
Accepted Answers:
2 of 4 Friday 21 June 2019 10:13 AM
Electromagnetic Waves in Guided and Wireless... https://onlinecourses-archive.nptel.ac.in/noc19_...
144 mW
8) Neglecting ohmic loss, how much power must the antenna 1 point
transmit if it is a quarter wave dipole?
158 mW
144 mW
72 mW
36 mW
No, the answer is incorrect.
Score: 0
Accepted Answers:
72 mW
9) The
maximum effective area of a λ/2 wire dipole operating at 1 point
300 MHz is _________ m2
0.26
13
26
0.13
No, the answer is incorrect.
Score: 0
Accepted Answers:
0.13
10)How much power is received in Q-9 with an incident plane 1 point
wave of strength 2 mV/m?
0.71 nW
1.42 nW
0.35 nW
2.12 nW
No, the answer is incorrect.
Score: 0
Accepted Answers:
0.71 nW
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