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ESE EC : Electromagnetics Champion Quiz 1
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Question 1
Match List-i (Type of Antenna) with List-ii (Example) and select the correct answer using the code given below the lists:
List-i
A. Aperture antenna
B. Circularly polarized
C. Frequency independent
D. Isotropic antenna
List-ii
1. Helical antenna
2. Point source antenna
3. Log periodic antenna
4. Microstrip antenna
List-i
A. Aperture antenna
B. Circularly polarized
C. Frequency independent
D. Isotropic antenna
List-ii
1. Helical antenna
2. Point source antenna
3. Log periodic antenna
4. Microstrip antenna
Question 2
If the total power to an antenna is Wt, radiated power is Wr, and the radiation intensity is ∅, then match List-i with List-ii and select the correct answer using the code given below the Lists:
List-i List-ii
A- Power gain 1.
B- Directive gain 2.
C- Average power radiated 3.
D- Efficiency of the antenna 4.
Codes:
A B C D
List-i List-ii
A- Power gain 1.
B- Directive gain 2.
C- Average power radiated 3.
D- Efficiency of the antenna 4.
Codes:
A B C D
Question 3
Consider the following statements regarding an antenna:
1. It is a transducer.
2. Its performance is essentially frequency sensitive.
3. It is a reciprocal device.
4. With increase in its effective aperture area, width of the radiated beam increases.
Which of the above statements are correct?
1. It is a transducer.
2. Its performance is essentially frequency sensitive.
3. It is a reciprocal device.
4. With increase in its effective aperture area, width of the radiated beam increases.
Which of the above statements are correct?
Question 4
Which of the following does not apply to Yagi-Uda antenna
Question 5
Consider the following statements:
The inter element spacing of
1. More than
in array antenna will produce grating lobes in unscanned condition.
2. More that
/2 but less than 
in array antenna will produce grating lobes in unscanned condition.
3. Less than
/2 in array antenna will not produce any grating lobes.
4. More than 1.5
in array antenna will no: produce any grating lobe.
Which of these statements are correct?
The inter element spacing of
1. More than
in array antenna will produce grating lobes in unscanned condition. 2. More that
/2 but less than in array antenna will produce grating lobes in unscanned condition. 3. Less than
/2 in array antenna will not produce any grating lobes. 4. More than 1.5
in array antenna will no: produce any grating lobe. Which of these statements are correct?
Question 6
An antenna located on the surface of a flat earth transmits an average power of 200 kW. Assuming that all the power radiated uniformly over the surface of a hemisphere with the antenna at the center, the time average Poynting vector at 50 km is
Question 7
An antenna can be modeled as an electric dipole of length 5 m at 3 MHz. Find the radiation resistance of the antenna assuming uniform current over the length.
Question 8
For a dipole antenna
Question 9
For the microwave antenna
Question 10
The ideal gain of a parabolic antenna of diameter 10 m for a wavelength of 316 cm is
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May 15ESE & GATE EC
