Antenna & Wave Propagation - Electronic Engineering (MCQ) questions & answers
Dear Readers, Welcome to Antenna & Wave Propagation multiple choice questions and answers with explanation. These objective type Antenna & Wave Propagation questions are very important for campus placement test, semester exams, job interviews and competitive exams like GATE, IES, PSU, NET/SET/JRF, UPSC and diploma.
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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