#Antenna and wave propagation ppt Patch#
Which antennas are renowned as patch antennas especially adopted for space craft applications?Ĥ6. Which type of wire antennas are also known as dipoles?Ĥ5. Which among the following plays a primary role in generation of conduction current in an ionosphere due to presence of electric field?Ĥ4. Which mechanism/s is/are likely to occur in mid-frequency operation corresponding to ionospheric region?Ĥ3. According to Snell’s law in optics, if a ray travels from dense media to rarer media, what would be its direction w.r.t the normal?Ĥ2. By which name/s is an ionospheric propagation, also known as?Ĥ1. After which phenomenon/phenomena do the waves arrive at the receiving antenna in ionospheric propagation?Ĥ0. Which type of ground wave travels over the earth surface by acquiring direct path through air from transmitting to receiving antennas?ģ9. In an electrical circuit,which nature of impedance causes the current & voltages in phase?ģ8. If the magnetic field component of a plane wave in a lossless dielectric is H = 50 sin (2π x 106 t – 6x) azmA/m, what will be the wave velocity?ģ7. Which equations are regarded as wave equations in frequency domain for lossless media?ģ6. Which among the following exhibits perpendicular nature in TEM wave?ģ5. In ungrounded antennas, if an excitation is applied directly across the base insulator, then on which factor/s would the voltage across the insulator depend?ģ4. If the tower antenna is not grounded, which method of excitation is/are applicable for it?ģ3. For which band/s is the space wave propagation suitable over 30 MHz?ģ2. Which mode of propagation is adopted in HF antennas?ģ1. How are the infinitesimal dipoles represented in terms of antenna length and signal wavelength?ģ0.
Which waveform plays a crucial role in determining the radiation pattern of the dipole/wire antennas?ġ9. If an observation point is closely located to the source, then the field is termed as _ġ8. Which among the following defines the angular distance between two points on each side of major lobe especially when the radiation drops to zero?ġ7. At which angles does the front to back ratio specify an antenna gain?ġ6. In a non-isotropic directional antenna, which radiating lobe axis makes an angle of 180° w.r.t. For a charge oscillating in time motionĪns: For a charge oscillating in time motionġ4.
For a charge moving with uniform velocity with straight & infinite wireĬ. Under which conditions of charge does the radiation occur through wire antenna?ī. Metallic device for radiating or receiving radio wavesĪns: Metallic device for radiating or receiving radio wavesġ3.
#Antenna and wave propagation ppt free#
Transducer between guided wave & free space waveĭ. According to Webster’s dictionary, what is an antenna?Ĭ. The knowledge of which parameter is sufficient for deriving the time varying electromagnetic field?ġ2. F2 layer of appleton region acts as a significant reflecting medium for _ frequency radio wavesġ1.
What is the possible range of height for the occurrence of sporadic E-region with respect to normal E-region?ġ0. Which ionization layer exists during day time & usually vanishes at night due to highest recombination rate?ĩ. 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?Ĩ. Power density is basically termed as _ power per unit areaħ. Interference of normal radiation & radio wave propagationĦ. Which among the following is/are not present in free space?Ĭ. In which kind of waveform is the phase velocity defined?ĥ. Wavefront is basically a locus of points acquiring similar _Ĥ. Which among the following is an application of high frequency?ģ. What is the wavelength of Super high frequency (SHF) especially used in Radar & satellite communication?Ģ. ANTENNA and WAVE PROPAGATION Objective Questions and Answers :-ġ.
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