Multiple Choice Questions and Answers on Antenna & Wave Propagation
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Course
Antenna & Wave Propagation
Institution
Antenna & Wave Propagation
Multiple Choice Questions and Answers on Antenna & Wave Propagation
1) What is the wavelength of Super high frequency (SHF) especially used in Radar &
satellite communication?
a. 1 m – 10 m
b. 1 cm – 10 cm
c. 10 cm – 1 m
d. 0.1 cm – 1 cm
ANSWER: 1 cm – 10 cm
2) Which among t...
Multiple Choice Questions and Answers on Antenna & Wave Propagation
1) What is the wavelength of Super high frequency (SHF) especially used in Radar &
satellite communication?
a. 1 m – 10 m
b. 1 cm – 10 cm
c. 10 cm – 1 m
d. 0.1 cm – 1 cm
ANSWER: 1 cm – 10 cm
2) Which among the following is an application of high frequency?
a. SONAR
b. Subsurface communication
c. Radio navigation
d. Facsimile
ANSWER: Facsimile
3) Wave front is basically a locus of points acquiring similar
a. Phase
b. Frequency
c. Amplitude
d. Wave equation
ANSWER: Phase
4) In which kind of waveform is the phase velocity defined?
a. Sinusoidal
b. Rectangular
c. Square
d. Triangular
ANSWER: Sinusoidal
5) Which among the following is/are not present in free space?
a. Solid bodies
b. Ionized particles
c. Interference of normal radiation & radio wave propagation
d. All of the above
,ANSWER: All of the above
6) Power density is basically termed as power per unit area
a. Reflected
b. Refracted
c. Radiated
d. Diffracted
ANSWER: Radiated
7) If the path difference of two waves with single source traveling by different paths to
arrive at the same point, is λ/2, what would be the phase difference between them?
a. β x (λ/2)
b. β / (λ/2)
c. β + (λ/2)
d. β – (λ/2)
ANSWER: β x (λ/2)
8) Which ionization layer exists during day time & usually vanishes at night due to highest
recombination rate?
a. D-region
b. Normal E-region
c. Sporadic E-region
d. Appleton region
ANSWER: D-region
9) What is the possible range of height for the occurrence of sporadic E-region with
respect to normal E-region?
a. 20 km – 50 km
b. 45 km – 85 km
c. 90 km – 130 km
d. 140 km – 200 km
ANSWER: 90 km – 130 km
10) F2 layer of appleton region acts as a significant reflecting medium for frequency
radio waves
a. Low
b. Moderate
,c. High
d. All of the above
ANSWER: High
11) The knowledge of which parameter is sufficient for deriving the time varying
electromagnetic field?
a. Electric field intensity
b. Magnetic field intensity
c. Current density
d. Power density
ANSWER: Current density
12) According to Webster’s dictionary, what is an antenna?
a. Impedance matching device
b. Sensor of electromagnetic waves
c. Transducer between guided wave & free space wave
d. Metallic device for radiating or receiving radio waves
ANSWER: Metallic device for radiating or receiving radio waves
13) Under which conditions of charge does the radiation occur through wire antenna?
a. For a charge with no motion
b. For a charge moving with uniform velocity with straight & infinite wire
c. For a charge oscillating in time motion
d. All of the above
ANSWER: For a charge oscillating in time motion
14) 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
ANSWER: Back lobe
15) 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°
ANSWER: 0° & 180°
16) 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)
ANSWER: First null beam width (FNBW)
17) If an observation point is closely located to the source, then the field is termed as
a. Induced
b. Radiated
c. Reflected
d. Far-field
ANSWER: Induced
18) Which waveform plays a crucial role in determining the radiation pattern of the
dipole/wire antennas?
a. Current
b. Voltage
c. Frequency
d. Phase
ANSWER: Current
19) How are the infinitesimal dipoles represented in terms of antenna length and signal
wavelength?
a. l ≤ (λ /50)
b. (λ/50 ) < l ≤ (λ /10)
c. l = λ/2
d. None of the above
ANSWER: l ≤ (λ /50)
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