Description : How many major lobes are produced by a paraboloid reflector?
Last Answer : One.
Description : A parabolic reflector changes a spherical wavefront to what type of wavefront?
Last Answer : Plane.
Description : As the spacing between elements in a broadside array increases, what is the effect on the major lobes?
Last Answer : They sharpen.
Description : What is the primary difference between the major and minor lobes of a radiation pattern?
Last Answer : Major lobes have the greatest amount of radiation.
Description : ECE Board Exam March 1996 An antenna that is circularly polarized is the ____________. A. parabolic reflector B. helical C. Yagi-uda D. small circular loop
Last Answer : B. helical
Description : Cassegrain feedis usedwith a parabolic reflectorto a. increase the gain of the system b. increase the beamwidth of the system c. reduce the size of the main reflector d. allowthe feedtobeplacedata convenientpoint
Last Answer : d. allowthe feedtobeplacedata convenientpoint
Description : Anantenna thatis currentlypolarized usthe a. helical b. small circular loop c. parabolic reflector d. Yagi-Uda
Last Answer : a. helical
Description : The broadside array consists of a flat reflector and what other elements?
Last Answer : Two or more half-wave dipoles.
Description : What type of reflector is most often used in directive antennas?
Last Answer : Parabolic.
Description : What two main advantages of a parasitic array can be obtained by combining a reflector and a director with the driven element?
Last Answer : Increased gain and directivity.
Description : Very low signal strength in antenna. A. Minor lobes B. Null C. Antenna patterns D. Major lobes
Last Answer : B. Null
Description : When a wavefront is radiated into a waveguide, what happens to the portions of the wavefront that do not satisfy the boundary conditions?
Last Answer : Decrease to zero.
Description : What are three ways of controlling radiated emi during transmission?
Last Answer : a) physical separation of the antenna (b) limiting bandwidth of the antenna (c) use of directional antennas
Description : If a target is on the bearing axis of the radiated beam, what is the input to the bearing IF channel?
Last Answer : Zero.
Description : What width is the pulse radiated by fire-control tracking radar?
Last Answer : Very narrow.
Description : What characteristic(s) of radiated energy is (are) altered to achieve electronic scanning?
Last Answer : Frequency or phase.
Description : What is the polarization of the energy radiated by a vertical slot?
Last Answer : Horizontal.
Description : What is the term that is used to describe narrowness in the radiated beam of an antenna?
Last Answer : Antenna directivity.
Description : Ear piercings (cartilage, not lobes) is a meaning attached to the individual locations on the ear?
Last Answer : It’s just decoration. There are a lot of stories about earring meanings, but they don’t hold up. Most of them are schoolyard myths.
Description : I have billions of eyes, yet I live in darkness. I have millions of ears, yet only four lobes. I have no muscle, yet I rule two hemispheres. What am I? -Riddles
Last Answer : The human brain.
Description : Is there any special name for the connective that connects 2 anther lobes in dithecous anther? -Biology
Last Answer : answer:
Description : Which of the following lobes of pituitary atrophies during fetal development and is smaller is adults ?
Last Answer : Which of the following lobes of pituitary atrophies during fetal development and is smaller ... Pars intermedia C. Adenohypophysis D. Neuronhypophysis
Description : Which of the following anatomical considerations is correct: A. optic chiasm lesions characteristically produce a bitemporal hemianopia B. central scotoma occurs early in papilloedema C. in ... hemianopia E. opticokinetic nystagmus is found with bilateral infarction of the parieto-occipital lobes
Last Answer : Ans: A
Description : Width measured in degrees of a major lobes between end of the love at which the relative power is one half (-3dB) its value from the peak of the lobe. A. Bandwidth B. Wavelength C. Radiation D. Beamwidth
Last Answer : D. Beamwidth
Description : Write the names of Cerebral Cortex Lobes?
Last Answer : •Frontal Lobes • Occipital Lobes •Parietal Lobes • Temporal Lobes
Description : A ____ pump consists of a reciprocating or rotating cavity between two lobes or gears and a rotor. a. positive c. negative b. centrifugal d. hand
Last Answer : a. positive
Description : Rabbit liver is made of (a) 4 lobes (b) 6lobes (c) 5 lobes (d) 7 lobes
Last Answer : (c) 5 lobes
Description : What are the modifications of bracts, bracteoles and perianth lobes in a compound spike.
Last Answer : Ans: In compound spike, bracts are modified into sterile Glumes and fertile Lemma, Bracteoles as palea, and perianth lobes as Lodicules.
Description : In which cerebral lobes is the speech center located? Is it the: a) frontal b) parietal c) temporal d) occipital
Last Answer : ANSWER: A -- frontal
Description : To hear a clear resonance, what must be the distance between the listener and the reflector? -General Knowledge
Description : What is the degree of angle between the perpendicular and the reflector ?
Last Answer : The angle between the perpendicular and the reflector is 90 degrees.
Description : Who Invented the Reflector Telescope ?
Last Answer : Scientist Newton invented the reflecting telescope.
Description : What is the minimum distance between the reflector and the source to hear the echo? ?
Last Answer : The minimum distance between the reflector and the source to hear the echo is 18.6 meters.
Description : What is the difference between reflex and reflector telescope ?
Last Answer : refractive telescope 1. This device uses two or three convex lenses or one convex lens and one concave lens to form reflection through refraction. 2. The color of the reflection in this device is ... 5. It is relatively easy to make mirrors for large children. . The scattering capacity is high.
Description : What is the midpoint of the reflector surface of a spherical mirror called ?
Last Answer : The center point of the reflecting surface of a spherical mirror is called pole.
Last Answer : The medium through which the word is reflected back is called the reflector.
Description : Horn-Fed Cassegrain reflector antenna
Last Answer : Design Horn-Fed Cassegrain reflector antenna for operating frequency, gain, beam width, dish ... Provide proper citations and references in write-up
Description : To hear a clear echo, the distance between the listener and the reflector should be
Last Answer : 17 METER
Description : A white and smooth surface is – (1) good absorber and good reflector of heat (2) bad absorber and good reflector of heat (3) good absorber and bad reflector of heat (4) bad absorber and bad reflector of heat
Last Answer : (2) bad absorber and good reflector of heat Explanation: Shiny surfaces are poor absorbers of heat radiation and the best reflectors of heat radiation. Black surfaces are the best emitters and best absorber of heat radiation.
Description : The earth is a – (1) good reflector of heat (2) non-absorber of heat (3) good absorber and good radiator of heat (4) bad absorber and bad radiator of heat
Last Answer : (3) good absorber and good radiator of heat Explanation: The earth's surface radiates as a black body, since it aborts and radiates with nearly 100 percent efficiency for its temperatures. Gases, on the contrary, are selective absorbers and radiators.
Description : Convex mirror is generally used in - (1) solar cookers (2) opthalmoscope (3) reflector for head light (4) rear view mirror
Last Answer : (4) rear view mirror Explanation: Rear view mirrors of carsare convex mirrors as they enable the driver to see a wide area of the road behind the car. The convex mirror makes the rays of ... if they were coming from its focus, thereby produdcing a diminished virtual image which the driver can see.
Description : Which nuclear reactor uses water as a coolant, moderator and reflector ?
Last Answer : Pressurised water reactor.
Description : Which of the following improves antenna directivity? A. Driven element B. Reflector element C. Director element D. Parasitic element
Last Answer : D. Parasitic element
Description : A dipole antenna requires to be fed with 20 kW of power to produce a given signal strength to a particular distant point. If the addition of a reflector makes the same field strength available with an input power of 11kW ... Gain referred to this particular dipole). A. 4.75 B. 2.6 C. 1.81 D. 4.24
Last Answer : B. 2.6
Description : The main function of a communications satellite is a/ an A. repeater B. reflector C. beacon D. observation platform
Last Answer : A. repeater
Description : Which of the following is the basic component of a communications satellite receiver? A. On-board computer B. Reflector C. Telemetry D. Transponder
Last Answer : D. Transponder
Description : Known as the technique for adding a series inductor at or near the center of an antenna element in order to cancel the capacitive reactance of an antenna. A. Dipole B. Center loading C. Reflector D. loading coil
Last Answer : D. loading coil
Description : The reflector and director of an antenna array are considered as A. Parasitic elements B. Transcendental elements C. Feed-points D. Driven elements
Last Answer : A. Parasitic elements