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Unit 8 - Week 6
Lectures
Register for
Certification exam Assignment 6
The due date for submitting this assignment has passed.
Course As per our records you have not submitted this Due on 2019-04-10, 23:59 IST.
outline
assignment.

How to access 1) Ifin a rectangular waveguide for which a = 2b, the cutoff 1 point
the portal frequency for T E02 mode is 12 GHz, the cutoff frequency
for T M11 mode is________ GHz.
Assignment 0

12
Week 1 Lectures
3
Week 2 Lectures
–
√5
Week 3 Lectures

–
Week 4 Lectures 3√5
No, the answer is incorrect.
Week 5 Lectures
Score: 0

Week 6 Lectures Accepted Answers:

–
3√5
Modes of
Rectangular 2) A tunnel is modelled as an air-filled metallic rectangular waveguide with dimensions a = 4 m 1 point
Waveguides and b = 20 m. Determine whether the tunnel will pass: (a) a 1.5-MHz AM broadcast signal, (b) a
Waveguides 120-MHz FM broadcast signal.
summary and
Introduction to AM
Radiation
FM
Solution to
Electric Scalar Both
Potential and Neither
Magnetic
Vector Potential No, the answer is incorrect.
Equations Score: 0
Further Accepted Answers:
discussion on FM
Magnetic
Vector Potential 3)©A2014
standard air-filled
NPTEL - Privacy rectangular
& Terms waveguide
- Honor Code - FAQs - with dimensions a 1 point
and Elementary
A project of
Hertzian Dipole
= 8.636 cm, b = 4.318 cmIn is fed by a
association with 4 GHz carrier from a coaxial
cable.
Near field and
Far-field
Solve questions 3-5
Antenna and Determine the cutoff frequency Funded byfor T E10 mode to propagate.
Properties of

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Electromagnetic Waves in Guided and Wireless... https://onlinecourses-archive.nptel.ac.in/noc19_...

Antennas
1.737Powered
GHz by
Quiz :
3.473 GHz
Assignment 6
0.869 GHz
Assignment 6
Solution 6.948 GHz

Week 7 Lectures No, the answer is incorrect.

Score: 0
Week 8 Lectures Accepted Answers:
1.737 GHz

4) The phase velocity is ______ m/s. 1 point

3.33 × 108

0.24 × 108

6.9 × 108

1.35 × 108
No, the answer is incorrect.
Score: 0
Accepted Answers:
3.33 × 108
5) The group velocity is ______ m/s. 1 point

3.33 × 108

2.702 × 108

5.404 × 108

1.351 × 108
No, the answer is incorrect.
Score: 0
Accepted Answers:
2.702 × 108
6) In an air-filled rectangular waveguide, the cutoff frequency of a T E10 mode is 5 GHz, 1 point
whereas that of T E01 mode is 12 GHz. Solve question 6 and 7.

The dimensions of the waveguide are______

a=3 cm, b=1.25 cm

a=1.5 cm, b=1.25 cm

a=3 cm, b=2.5 cm

a=1.5 cm, b=2.5 cm

No, the answer is incorrect.

Score: 0
Accepted Answers:
a=3 cm, b=1.25 cm

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7) The next three higher TE modes after the lowest mode are? 1 point

T E30 , T E21 , T E11

T E20 , T E01 , T E11

T E20 , T E11 , T E41

T E02 , T E10 , T E11

No, the answer is incorrect.
Score: 0
Accepted Answers:
T E20 , T E01 , T E11
8) The ratio of the radiated intensity in the direction at which the intensity is maximum to the 1 point
average radiated intensity is termed as which property of the antenna?

Directivity

Gain

Power Efficiency

Radiation Resistance

No, the answer is incorrect.

Score: 0
Accepted Answers:
Directivity

9) The near field of an antenna varies with distance r as 0 points

1/r

1/r3

1/r2

1/r4
No, the answer is incorrect.
Score: 0
Accepted Answers:
1/r2
10)The far field of an antenna varies with distance r as 1 point

1/r

1/r3

1/r2

1/r4
No, the answer is incorrect.

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Electromagnetic Waves in Guided and Wireless... https://onlinecourses-archive.nptel.ac.in/noc19_...

Score: 0
Accepted Answers:
1/r
11)The vector H̄ in the far field of an antenna satisfies 1 point

∇. H̄ = 0 and ∇ × H̄ ≠ 0

∇. H̄ ≠ 0 and ∇ × H̄ ≠ 0

∇. H̄ ≠ 0 and ∇ × H̄ = 0

∇. H̄ = 0 and ∇ × H̄ = 0
No, the answer is incorrect.
Score: 0
Accepted Answers:
∇. H̄ = 0 and ∇ × H̄ ≠ 0

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