Description : An antenna with very high gain and very narrow beamwidth. A. Helical antenna B. Discone antenna C. Horn antenna D. Parabolic dish antenna
Last Answer : D. Parabolic dish antenna
Description : A choir consisting of 36 individuals all of whom can sing with the same intensity. A soloist sings a certain passage and then is joined by the remainder of the choir members for a repeat of the passage. What is the ... sound intensity level in the two cases? A. 3 dB B. 6 dB C. 36 dB D. 15.6dB
Last Answer : D. 15.6dB
Description : A parabolic dish antenna isa(n)_______ antenna. A) omnidirectional B) bidirectional C) unidirectional D) horn
Last Answer : unidirectiona
Description : The most widely used antenna in GPS is (A) Parabolic antenna (B) Microstrip antenna (C) Horn antenna (D) Slotted antenna
Last Answer : Answer: Option B
Description : One of the following is very useful as a multiband HF receiving antenna. A. Parabolic antenna B. Elementary doublet C. Log-periodic D. Square loop
Last Answer : C. Log-periodic
Description : What antenna can be used to minimize the effect of Faraday rotation of polarization? A. Dipole B. Parabolic C. Helical D. Rhombic
Last Answer : C. Helical
Description : What illumination factor is normally considered in computing parabolic antenna gain in microwave communications? A. 0.54 B. 0.65 C. 0.75 D. 0.85
Last Answer : A. 0.54
Description : How does the gain of a parabolic dish type antenna change when the operating frequency is doubled? A. Gain does not change B. Gain is multiplied by 0.707 C. Gain increases 6 dB D. Gain increases 3 dB
Last Answer : C. Gain increases 6 dB
Description : ECE Board Exam March 1996 A type of an underground antenna is a/an __________ antenna. A. Hertz B. isotropic C. parabolic D. Marconi
Last Answer : A. Hertz
Description : Which antenna radiates an omnidirectional pattern in the horizontal plane with vertical polarization? A. Marconi antenna B. Discone antenna C. Horn antenna D. Helical antenna
Last Answer : A. Marconi antenna
Description : _________ detects the satellite signal relayed from the feed and converts it to an electric current, amplifies and lower its frequency. A. Horn antenna B. LNA C. Satellite receiver D. Satellite dish
Last Answer : B. LNA
Description : One ofthe followingis veryuseful as amultibandHFreceivingantenna.Thisisthe: a. conical horn b. folded dipole c. log periodic d. square loop
Last Answer : c. log periodic
Description : Noise consisting of irregular pulses of short duration and relatively high amplitude, A. Quantizing noise B. Tone interference C. Impulse noise D. Cross talk
Last Answer : C. Impulse noise
Last Answer : A. Quantizing noise
Description : What do you call a cable consisting of twisted pairs of conductors, each separately insulated? A. Microstrip line B. Strip line C. Quad D. Coaxial cable
Last Answer : C. Quad
Description : ______ is a term in the test language for noise testing in telephone circuits that means a one-syllable word consisting of a consonant, a vowel, and another consonant. A. Logatom B. Nosfer C. Ore D. Belcore
Last Answer : A. Logatom
Description : What are electromagnetic waves? A. Alternating currents in the core of an electromagnet B. A wave consisting of two electric fields at right angles to each other C. A wave consisting of an electric field ... to each other D. A wave consisting of two magnetic fields at right angles to each other
Last Answer : C. A wave consisting of an electric field and a magnetic field at right angles to each other
Description : A transmission line consisting of two conductors that have equal resistance per unit length. A. Unbalanced line B. Open-wire line C. Balanced line D. Coaxial line
Last Answer : C. Balanced line
Description : What are electromagnetic waves? A. A wave consisting of two magnetic fields at right angles to each other B. A wave consisting of an electric field and a magnetic field at right angles to each ... core of an electromagnet D. A wave consisting of two electric fields at right angles to each other
Last Answer : B. A wave consisting of an electric field and a magnetic field at right angles to each other.
Description : Satellite system or part of a satellite system, consisting of only one satellite and the operating earth station. A. Satellite system B. Satellite network C. Space system D. Multi-satellite link
Last Answer : B. Satellite network
Description : I would like to know when your next available cpr cass is going to be. the date time location of class and fee how do i register for the class?
Last Answer : I do not have any you should contact the red cross
Description : Determine the gain of a 6 ft. parabolic dish operating at 1800 MHz. A. 30 dB B. 11.2 dB C. 15.5 dB D. 28.17 dB
Last Answer : D. 28.17 dB
Description : What is the free space loss, in dB, between two microwave parabolic antennas 38.0 kilometer apart operating at 7.0 GHz? A. 145.6 dB B. 138.5 dB C. 135.5 dB D. 140.89 dB
Last Answer : D. 140.89 dB
Description : Which of the following antennas is best excited from a waveguide? A. Biconical B. Horn C. Helical D. Discone
Last Answer : B. Horn
Description : ECE Board Exam March 1996 A car horn outdoors produces a sound intensity level of 90 dB at 10 ft away. At this distance, what is the sound power in watt? A. 12 W B. 0.12 W C. 0.012 W D. 1.2 W
Last Answer : C. 0.012 W
Description : Can you help me understand what a parabolic cylinder is in the context of this problem?
Last Answer : answer:I’m just guessing here, but it sounds to me that instead of a normal cylinder with a circular wall, the cylinder you’re looking at here is ovoid (if closed), meaning that sections of it would have a parabolic curved wall. Here are some examples, if it helps.
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 : Dish antenna is parabolic in shape and has meshy structure. Give reasons.
Last Answer : A Practical reflector employing the properties of the parabola will be a three dimensional bowl-shaped surface, obtained by revolving the parabola about the axis AB. The resulting geometric ... (directrix) is constant. These geometric properties yield an excellent microwave or light 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 : Zoningis usedwith adielectric antenna inorderto a. reduce the bulk of the lense b. increase the bandwidth of the lens c. increase pin-point focusing d. correct the curvature of the wavefront from a horn that is too short
Last Answer : a. reduce the bulk of the lense
Description : Draw the structure and state applications of: i) Ferrite loop (rod) antenna ii) Horn antenna
Last Answer : Horn antenna: Application:- i) Used at microwave frequency. ii) Used in satellite tracking. Ferrite loop antenna: Application:- In Am radio receiver to receive MW and SW band signals. In FM radio receiver
Description : Write one application of following antenna i. Rectangular antenna ii. Dish antenna iii. Yagi-Uda antenna iv. Horn antenna
Last Answer : i. Rectangular antenna is used in direction finding in portable recievers. ii. Dish antenna is used to transmit and receive signal from satellite. iii. Yagi-Uda antenna is used in HF and VHF range as a TV receiving antenna. iv. Horn antenna is used in satellite tracking.
Description : Draw radiation pattern for following antenna i) Yagi-Uda antenna ii) Loop antenna iii) Dish antenna iv) Horn antenna
Last Answer : Type of antenna Radiation Patteren Yagi-Uda antenna Loop antenna Dish antenna Horn antenna
Description : Draw the structure of horn antenna and its radiation pattern. List its any two applications.
Last Answer : The structure of horn antenna Radiation pattern of Horn Antenna Application:- i) Used at microwave frequency. ii) Used in satellite tracking
Description : Write the application of the following antennas: 1) Rectangular antenna 2) Dish antenna 3) Horn antenna 4) Loop antenna 5) Yagi-Uda antenna.
Last Answer : Applications: 1.Rectangular antenna i)Used in Mobile and satellite communication ii)Used in Global Positioning System iii) Used for Radio Frequency Identification (RFID) iv) Radar Dish ... antenna. 2. Yagi-Uda antenna is used in conditional Access System (CAS) at the decryptor.
Description : Which of the following compounds loses optical activity due to pyramidal inversion?
Last Answer : Which of the following compounds loses optical activity due to pyramidal inversion? A. B. C. D.
Description : The ammonium ion is (a) Square planar (b) Tetrahedral (c) Square pyramidal (d) Trigonal pyramidal
Last Answer : Ans:(b)
Description : Trimetyl amine is pyramidal while trisilyl amine is trigonal planer . explain ?
Last Answer : Ans. In tri silylamine N is sp2 hybridised and pπ-dπ bonding take place while In trimethyl amine N is SP3 hybridised and No pπ-dπ bonding .
Description : Explain why PCl5 is trigonal bipyramidal and IF5is square pyramidal?
Last Answer : Ans. PCl5 has 5 bond pairs of electrons around central atom while in IF5 there are 5 bond pair & 1 lone pair of electrons around central atom.
Description : What is the predicted shape, bond angle, and hybridization for CH3+? (a) trigonal planar, 120°, sp2 (b) trigonal planar, 120°, sp3 (c) trigonal planar, 109.5°, sp2 (d) trigonal pyramidal, 120°, sp2
Last Answer : trigonal planar, 120°, sp2
Description : What is the molecular geometry of thiocyanate (pron: thie-owe-SIE-a-nate) ion (SCN minus 1)? w) linear x) angular y) tetrahedral z) pyramidal
Last Answer : ANSWER: W -- LINEAR
Description : What is the molecular geometry of the Bromine Tetraflouride ion (B-F-4-minus 1) w) linear x) angular y) tetrahedral z) pyramidal
Last Answer : ANSWER: Y -- TETRAHEDRAL
Description : The structure of an ammonia molecule can best be described as: w) linear x) tetrahedral y) pyramidal z) triagonal planar
Last Answer : ANSWER: Y -- PYRAMIDAL
Description : Which antenna does not use the ground? A. Marconi B. Yagi C. Hertz D. Rhombic
Last Answer : B. Yagi
Description : Which antenna is not grounded at one end? A. Hertz B. Marconi C. Dipole D. Whip
Last Answer : C. Dipole
Description : Which one is an antenna coupling unit? A. Coupler B. Diplexer C. Lecher wire D. Duplexer
Last Answer : B. Diplexer
Description : _____ is an antenna made up of a number of full wavelengths A. Elementary doublet B. Log-periodic C. Long wire D. Whip
Last Answer : C. Long wire
Description : One of the following makes an antenna physically long but electrically short A. Adding L in series B. Adding C in series C. Top loading D. Both A and C
Last Answer : B. Adding C in series
Description : One of the following is not a reason for the use of an earth mat A. impossibility of a good ground connection B. provision of an earth for the antenna C. protection of personnel working underneath D. improvement of the radiation pattern of the antenna
Last Answer : C. protection of personnel working underneath
Description : Which antenna is not a wideband? A. Discone B. Folded dipole C. Helical D. Marconi
Last Answer : D. Marconi