1) 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
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2) 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
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3) 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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4) 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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5) 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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6) 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
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7) Which waveform plays a crucial role in determining the radiation pattern of the dipole/wire antennas? a. Current b. Voltage c. Frequency d. Phase
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8) 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
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9) In flared transmission line, the radiation phenomenon increases due to ________ in flaring a. Increase b. Decrease c. Stability d. None of the above
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10) Which pattern is generated due to plotting of square of amplitude of an electric field? a. Field Pattern b. Voltage Pattern c. Power Pattern d. All of the above
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