1) Self impedance of an antenna is basically __________
a. Its input impedance during the removal of all other antennas
b. Its impedance by taking into consideration the consequences of other antennas
c. Both a and b
d. None of the above
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Answer
Explanation
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ANSWER: Its input impedance during the removal of all other antennas
Explanation:
No explanation is available for this question!
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2) If an antenna draws 12 A current and radiates 4 kW, then what will be its radiation resistance?
a. 22.22 ohm
b. 27.77 ohm
c. 33.33 ohm
d. 39.77 ohm
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Answer
Explanation
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ANSWER: 27.77 ohm
Explanation:
No explanation is available for this question!
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3) Which property/ies of antenna is/are likely to be evidenced in accordance to Reciprocity theorem?
a. Equality of impedances
b. Equality of directional patterns
c. Equality of effective lengths
d. All of the above
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Answer
Explanation
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ANSWER: All of the above
Explanation:
No explanation is available for this question!
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4) Under which conditions of two unit vectors, the polarization loss factor (PLF) is equal to unity?
a. Perpendicular
b. Perfectly aligned
c. Angle inclination (Ψ p)
d. All of the above
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Answer
Explanation
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ANSWER: Perfectly aligned
Explanation:
No explanation is available for this question!
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5) According to the geometry, how many sterdians are present in a full sphere?
a. π/2
b. π
c. 2π
d. 4π
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Answer
Explanation
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ANSWER: 4π
Explanation:
No explanation is available for this question!
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6) Sterdian is a measurement unit of __________
a. Point angle
b. Linear angle
c. Plane angle
d. Solid angle
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Answer
Explanation
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ANSWER: Solid angle
Explanation:
No explanation is available for this question!
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7) Which antenna radiating region/s has/have independent nature of angular field distribution over the distance from the antenna?
a. Reactive near-field region
b. Fresnel region
c. Fraunhofer region
d. All of the above
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Answer
Explanation
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ANSWER: Fraunhofer region
Explanation:
No explanation is available for this question!
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8) Which among the following defines the angular distance between two points on each side of major lobe especially when the radiation drops to zero?
a. Half power beam width (HPBW)
b. First null beam width (FNBW)
c. Side lobe level (SLL)
d. Front to back ratio (FBR)
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Answer
Explanation
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ANSWER: First null beam width (FNBW)
Explanation:
No explanation is available for this question!
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9) At which angles does the front to back ratio specify an antenna gain?
a. 0° & 180°
b. 90° & 180°
c. 180° & 270°
d. 180° & 360°
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Answer
Explanation
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ANSWER: 0° & 180°
Explanation:
No explanation is available for this question!
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10) In a non-isotropic directional antenna, which radiating lobe axis makes an angle of 180° w.r.t. major beam of an antenna?
a. Minor lobe
b. Side lobe
c. Back lobe
d. None of the above
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Answer
Explanation
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ANSWER: Back lobe
Explanation:
No explanation is available for this question!
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