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ESE 2019 Technical ( Electromagnetics: Quiz 2 )
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Question 1
Consider the following statements regarding a transmission line:
1. Its attenuation is constant and independent of frequency.
2. Its attenuation varies linearly with frequency.
3. Its phase shift varies linearly with frequency.
4. Its phase shift is constant and is independent of frequency.
Which of the above statements are correct for distortionless line?
1. Its attenuation is constant and independent of frequency.
2. Its attenuation varies linearly with frequency.
3. Its phase shift varies linearly with frequency.
4. Its phase shift is constant and is independent of frequency.
Which of the above statements are correct for distortionless line?
Question 2
In a coaxial transmission line (εr = 1), the electric field intensity is given by:
The displacement current density is
The displacement current density is
Question 3
For matching of a radio frequency coaxial line to a purely reactive load
Question 4
What will be the minimum impedance on transmission line, if the transmission line has characteristics impedance of 100Ω which completes with 250Ω resistance?
Question 5
Find the VSWR in lossless transmission line, if impedance resistance is 100Ω and pure reactance load is (j150)Ω
Question 6
If the diameter of the antenna is 100m and its frequency is 50Hz, then what will be the radiating near field distance/
Question 7
Direction: Each of the question consist of two statements, one labeled as the ‘Statement (I)’ and the other as ‘Statement (II)’. Examine these two statements carefully and select the answer to these items using the codes given below:
Statement (I): An antenna of length λ/2 will have radiation patterns of two lobes.
Statement (II): An antenna of length 3λ/2 will have radiation pattern of two lobes and two minor lobes.
Statement (I): An antenna of length λ/2 will have radiation patterns of two lobes.
Statement (II): An antenna of length 3λ/2 will have radiation pattern of two lobes and two minor lobes.
Question 8
Statement (I): Helical antenna has the largest bandwidth, high directivity and circular polarization.
Statement(II): Log-periodic antenna has a broad bandwidth.
Statement(II): Log-periodic antenna has a broad bandwidth.
Question 9
With the symbols having their standard meanings, cut-off frequency (frequency below which wave propagation will not occur) for a rectangular waveguide is
Question 10
Of two concentric long conducting cylinders, the inner one is kept at a constant positive potential +V0 and the outer one is grounded. What is the electric field in the space between the cylinders?
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Nov 3ESE & GATE EC
