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Assignment Questions - 14183_191

Neets Module 11-Microwave Principles
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16 2-68.   Radar range is determined as a function of which of the following measures? 1.   Pulse travel time 2.   Elevation angle of the antenna 3.   Distance to the horizon 4.   Angular velocity of the energy 2-69.   The parabolic reflector is often used because it produces a radiation pattern with which of the following antenna characteristics? 1.   Omnidirectional 2.   Highly directive 3.   Many equal lobes 4.   Spherical wavefronts 2-70.   In a lens antenna, what is the purpose of the collimating lens? 1.   It produces spherical wavefronts 2.   It produces an omnidirectional pattern 3.   It forces parallel segments of the wavefront into spherical paths 4.   It forces radial segments of the wavefront into parallel paths 2-71.   A lens antenna which accelerates some portion of the wavefronts so that all wavefronts exit the lens at the same time is referred to as the 1.   metallic delay lens 2.   waveguide-type lens 3.   loaded microwave lens 4.   dielectric delay lens 2-72.   In a delay-type lens, the amount of delay in the phase of the wave passing through the lens is determined by which of the following characteristics? 1.   The dielectric constant of the lens 2.   The characteristic impedance of the lens 3.   The physical size of the lens 4.   All of the above 2-73.   What is/are the basic type(s) of antenna array(s) in common use? 1.   Driven only 2.   Parasitic only 3.   Parasitic and driven 2-74.   In a frequency-sensitive antenna, the physical length of the serpentine section and its relationship to the wavelength of the applied energy determines which of the following characteristics? 1.   Output power 2.   Beam narrowness 3.   Antenna efficiency 4.   Direction of the beam 2-75.   In a horizontal-slot antenna, the polarization of the energy is radiated in what direction? 1.   Vertical 2.   Spherical 3.   Horizontal 4.   Omnidirectional






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