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Electromagnetic Theory and Transmission Lines
Important Questions for Mid-2
Unit-3:Maxwell’s Equations (Time Varying Fields)
2 Marks
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2
3
4
5
Define Faraday’s Law.
Define Lenz’s Law.
Define Time Varying Potentials.
Define Transformer and Motional emf,s.
Define Displacement Current.
10 Marks
1
2
Write the Maxwell’s Equations for time varying Fields in Final Forms and Explain?
What is Displacement Current and how Maxwell Modified the corresponding Curl
Equation for time varying fields.
3 Explain about different types of emf,s and Time varying potentials.
Unit-4:EM Wave Characteristics
2 Marks
1
2
3
4
5
What is polarization.
Define skin depth and Brewster angle.
Define Reflection co-efficient, Transmission coefficients and Standing wave ratio.
Define Poynting vector.
Define Snell’s Law.
10 Marks
1
2
Derive the expressions for Γ and τ of a plane wave reflection at normal incidence.
A Uniform plane wave in air with E=8cos(ωt-4x-3z) ay V/m is incident on a dielectric
slab(z≥o) with µr=1, ϵr=2.5, σ=0. Find(a) The polarization of the wave
(b) The angle of incidence (c)The reflected E field.
3 Define skin depth for conducting medium. And give its expression.
4 A Lossless medium for which η=60π, µr=1 and H=-0.1 cos(ωt-z) ax +0.5 sin(ωt-z) ay
A/m. Calculate ϵr, ω and E.
5 Explain about the wave propagation in lossy dielectric Medium.
Unit-5:Transmission Lines
2 Marks
1
2
3
4
5
What are the different types of transmission Lines.
Explain how a wave will propagate through a Co-axial Cable.
Compare lossy, lossless and distortion less lines.
Derive the expressions for Maximum and minimum Input impedances.
Compare Short Circuited, Open Circuited and Matched Lines.
10 Marks
1
2
3
Derive the Expression for input impedance of a transmission line.
Explain about the Construction of a Smith Chart.
A Distortionless line has Z0=60 Ohms, α=mNp/m, velocity of 0.6c. Whare c is the
velocity of light in vaccum.Find R,L,G,C and λ at 100MHz.
4 A Load of 100+j150 Ω is connected to 75 Ω lossless line. Find(a)Γ (b)s (c) input
impedance at a distance of 0.4λ from the load. (d) Load admittance (e) locations of
Vmax and Vmin for 0.6 λ from the load. (f) Input impedance at the Generator.
5 Write short notes on (i)Phase velocity (ii) Group velocity (iii) λ/4 matched line (iv)
stub lines (v) Slotted line.
K.Raveendra,Associate Professor & In-charge Examination Branch,
S V Engineering College for Women