Antenna & Wave Propagation - Electronic Engineering (MCQ) questions & answers

1)   A rectangular horn antenna operating at 4GHz has the wavelength of 0.075m and gain of about 13dBi. What will be its required capture area?
- Published on 01 Oct 15

a. 0.0149 m2
b. 0.0475 m2
c. 0.5521 m2
d. 0.9732 m2
Answer  Explanation  Related Ques

ANSWER: 0.0149 m2

Explanation:
No explanation is available for this question!


2)   Which mode of radiation occurs in an helical antenna due to smaller dimensions of helix as compared to a wavelength?
- Published on 01 Oct 15

a. Normal
b. Axial
c. Both a and b
d. None of the above
Answer  Explanation  Related Ques

ANSWER: Normal

Explanation:
No explanation is available for this question!


3)   By how many times is an input impedance of a folded dipole at resonance greater than that of an isolated dipole with same length as one of its sides?
- Published on 01 Oct 15

a. 2
b. 3
c. 4
d. 6
Answer  Explanation  Related Ques

ANSWER: 4

Explanation:
No explanation is available for this question!


4)   How do the elements of an active region behave?
- Published on 01 Oct 15

a. Inductive
b. Capacitive
c. Resistive
d. None of the above
Answer  Explanation  Related Ques

ANSWER: Resistive

Explanation:
No explanation is available for this question!


5)   In an electrically large loop, an overall length of the loop is equal to ______
- Published on 01 Oct 15

a. λ/2
b. λ
c. λ/10
d. λ/50
Answer  Explanation  Related Ques

ANSWER: λ

Explanation:
No explanation is available for this question!


6)   What is /are the advantages of using ferrite loops?

A. Increase in Magnetic field intensity
B. Increase in radiation resistance
C. Decrease in Magnetic field intensity
D. Decrease in radiation resistance

- Published on 01 Oct 15

a. A & B
b. C & D
c. A & D
d. B & C
Answer  Explanation  Related Ques

ANSWER: A & B

Explanation:
No explanation is available for this question!


7)   What is/are the major applications of an infinitesimal dipole that contribute/s to its analysis?
- Published on 01 Oct 15

a. Field pattern estimation due to any length of antenna
b. Improvement in radiation resistance by increasing dipole length
c. Both a and b
d. None of the above
Answer  Explanation  Related Ques

ANSWER: Both a and b

Explanation:
No explanation is available for this question!


8)   A dipole carries r.m.s. current of about 300A across the radiation resistance 2 Ω. What would be the power radiated by an antenna?
- Published on 01 Oct 15

a. 90 kW
b. 135 kW
c. 180 kW
d. 200 kW
Answer  Explanation  Related Ques

ANSWER: 180 kW

Explanation:
No explanation is available for this question!


9)   If J & M are active at the same time, which principle theorem is used for field estimation?
- Published on 01 Oct 15

a. Reciprocity
b. Superposition
c. Causality
d. Relativity
Answer  Explanation  Related Ques

ANSWER: Superposition

Explanation:
No explanation is available for this question!


10)   The concept of magnetic vector potential finds its major application in deriving expression of magnetic field intensity especially for ______
- Published on 01 Oct 15

a. Real fields
b. Imaginary fields
c. Complex fields
d. None of the above
Answer  Explanation  Related Ques

ANSWER: Complex fields

Explanation:
No explanation is available for this question!


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