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Dronacharya Group of Institutions, Greater Noida B. Tech

This document contains an exam for an Electrical and Electronics Engineering course on Antenna and Wave Propagation. It is divided into three sections. Section A contains 10 short answer questions defining key terms like antenna, polarization, directivity. Section B contains 5 long answer questions explaining topics like radiation intensity, retarded potential, effective aperture, binomial array, radiation resistance calculations. Section C contains 2 long answer questions on reciprocity theorem, power radiated by current elements, and array multiplication patterns. The exam tests students' understanding of fundamental antenna and wave propagation concepts.

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Amit Jain
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59 views2 pages

Dronacharya Group of Institutions, Greater Noida B. Tech

This document contains an exam for an Electrical and Electronics Engineering course on Antenna and Wave Propagation. It is divided into three sections. Section A contains 10 short answer questions defining key terms like antenna, polarization, directivity. Section B contains 5 long answer questions explaining topics like radiation intensity, retarded potential, effective aperture, binomial array, radiation resistance calculations. Section C contains 2 long answer questions on reciprocity theorem, power radiated by current elements, and array multiplication patterns. The exam tests students' understanding of fundamental antenna and wave propagation concepts.

Uploaded by

Amit Jain
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Dronacharya Group of Institutions,Greater Noida

B. Tech
Electrical And Electronics Engineering

Antenna and wave propagation (NEN-023) VI SEM


FIRST SESSIONAL EXAMINATION 2016-17

Time : 2Hrs Max Marks : 50

Section – A

Q.1. Attempt all parts: (1X10=10)

(a) What do you mean by antenna?


(b) Define TEM wave?
(c) What is the basic principal for the antenna to radiate EM waves?
(d) What do you mean by polarization?
(e) Give the significance of divergence of a vector
(f) Define isotropic radiator.
(g) Relate radian and sterradian.
(h) What do you understand by directivity and gain of an antenna?
(i) Define beam efficiency.
(j) List the applications of aperture antenna.

Section – B

Attempt any five questions: (5X5=25)

Q (2) Define radiation intensity and beam efficiency. Relate directivity D and gain G.
Q (3) Explain the importance of retarded potential.
Q (4) What is the effective aperture of an antenna and how it is related to the gain.
Q (5) Write a short note on Binomial array.
3
Q (6) Show that the directivity of small loop antenna is
2
Q (7) Prove that radiation resistance of half wave dipole antenna is 73 ohms.
Q (8) Compute the effective area of a half wave dipole.
Q (9) Evaluate the radiation resistance of an element of length L=1 m at an operating frequency
of 10 Mhz.
Section – C

Attempt any two questions: (7.5X2=15)

Q (10) How network theorems are useful to infer the properties of a receiving antenna from its
properties as a transmitting antenna?
Q (11) Derive the expression for power radiated by current element.
Q(12) write a short note on multiplication of arrays and show how the radiation pattern of 8
elements can be calculated using this.

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