Electronics and Communication Engineering - Electromagnetic Field Theory
Exercise : Electromagnetic Field Theory - Section 2
- Electromagnetic Field Theory - Section 1
- Electromagnetic Field Theory - Section 2
- Electromagnetic Field Theory - Section 3
- Electromagnetic Field Theory - Section 4
- Electromagnetic Field Theory - Section 5
- Electromagnetic Field Theory - Section 6
- Electromagnetic Field Theory - Section 7
- Electromagnetic Field Theory - Section 8
- Electromagnetic Field Theory - Section 9
- Electromagnetic Field Theory - Section 10
- Electromagnetic Field Theory - Section 11
- Electromagnetic Field Theory - Section 12
- Electromagnetic Field Theory - Section 13
1.
A material has conductivity of 10-2 mho/m and a relative permittivity of 4. The frequency at which conduction current in the medium is equal to displacement current is
Answer: Option
Explanation:
Conduction current density J = wD
J = σE σE = ωD = 2p fD
2.
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
Answer: Option
Explanation:
Pradiated = Gain of Antenna x Input power = G.I
10 log1010 . 1
10 watt.
3.
An end fire array consisting of several half-wave lengths of directive gain 40, then find the width of major lobe
Answer: Option
Explanation:
.
4.
A uniform plane EM wave incident normally on a plane surface of a dielectric material is reflected with a VSWR of 3. What percentage of incident power that is reflected?
Answer: Option
Explanation:
Preflected = |δ|2 Pincident
|δ|2 = 0.25 .
5.
Poynting vector is associated with which of the following?
Answer: Option
Explanation:
P = E x H
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