PTU B.Tech ECE 4th Semester May 2019 57513 ELECTROMAGNETIC FIELD THEORY Question Papers

PTU Punjab Technical University B-Tech May 2019 Question Papers 4th Semester Electronic and Communication Engineering (ECE)

Roll No.
Total No. of Pages : 02
Total No. of Questions : 09
B.Tech.(EIE) (2011 & Onwards) (Sem.?4)
ELECTROMAGNETIC FIELD THEORY
Subject Code : EC-208
M.Code : 57513
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1.
SECTION-A is COMPULSORY consisting of TEN questions carrying T WO marks
each.
2.
SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3.
SECTION-C contains T HREE questions carrying T EN marks each and students
have to attempt any T WO questions.

SECTION-A
1.
Answer briefly :

a. Differentiate between scalar quantity and a scalar field and vector quantity and

a vector field.

b. Discuss the cartesian coordinate system.

c. What is a waveguide? What is its importance and applications?

d. Define Propagation constant.

e. Define clearly dominant and degenerate modes with examples.

f. State the significance of smith chart and its features.

g. What is meant by characteristic impedance of transmission line?

h. State and prove Gauss law.

i. What is the equation of continuity for steady currents?

j. What are the condition for field to be irrotational?
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SECTION-B
2.
Write and explain Maxwell's equation for static and time varying fields in both
differential and integral form.
3.
Explain the electromagnetic wave is transverse in nature.
4.
Discuss the use of low loss RF and UHF transmission lines.
5.
A rectangular waveguide with dimensions 4cm ?2cm operates at 10GHz. Find fc and c
of TE10 mode.
6.
Explain in brief skin effect.

SECTION-C
7.
Derive the boundary conditions for time varying fields.
8.
Discuss reflection of electromagnetic wave from a perfect insulator incident obliquely.
9.
What is understood by polarization of EM waves? Explain linear, elliptical and circular
polarization with appropriate figures.








NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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