Online Questions and Answers Topic Outline
- MCQs in Basic considerations
- MCQs in Wire Radiators in Space
- MCQs in Isotropic Radiator
- MCQs in Current and Voltage Distributions
- MCQs in Resonant and Non-resonant Antennas
- MCQs in Antenna Terms and Definition
- MCQs in Antenna Gain and Resistance
- MCQs in Bandwidth, Beamwidth and Polarization
- MCQs in Grounded and Ungrounded Antennas
- MCQs in Grounding Systems and Matching Systems
- MCQs in Antenna Types
- MCQs in Directional and Non-directional Antennas
- MCQs in Microwave Antennas
- MCQs in Wideband and Special Purpose Antennas
MCQs in Antennas Series
Following is the list of multiple choice questions in this brand new series:
Continue Practice Exam Test Questions Part VII of the Series
301. For receive power density of 10 uW/m2 and a receive antenna with a capture area of 0.2 m2, determine the captured power.
- a. 0.5 uW
- b. 2 uW
- c. 1 uW
- d. 1.5 uW
302. The property of interchangeability for the transmitting and receiving operations is known as ______.
- a. efficiency
- b. accuracy
- c. reciprocity
- d. polarization
303. The length of a doublet at 27 MHz is _____.
- a. 8.67 ft
- b. 17.3 ft
- c. 18.2 ft
- d. 34.67 ft
304. Refers to the orientation of the electric field radiated from an antenna.
- a. efficiency
- b. beamwidth
- c. polarization
- d. accuracy
305. At frequencies below 2 MHz, what type of antenna is usually used?
- a. Marconi antenna
- b. Hertzian antenna
- c. Hertz antenna
- d. Elementary doublet
306. The angular separation between two half-power points in the major lobe of the antenna’s plane radiation pattern.
- a. bandwidth
- b. polarization
- c. efficiency
- d. beamwidth
307. Hertz antenna are predominantly used with frequencies above
- a. 3 MHz
- b. 4 MHz
- c. 5 MHz
- d. 2 MHz
308. Defined as the frequency range over which antenna operation is satisfactory
- a. beamwidth
- b. channel
- c. bandwidth
- d. baseband
309. One of the following is not an omnidirectional antenna.
- a. Half-wave dipole
- b. Log-periodic
- c. Discone
- d. Marconi
310. The point on the antenna where the transmission line is connected is called _______.
- a. center feed
- b. end feed
- c. feedpoint
- d. voltage feed
311. A popular vertical antenna is the _____>
- a. collinear
- b. dipole
- c. ground plane
- d. broadside
312. The discone antenna is
- a. a useful direction-finding antenna
- b. used as a radar receiving antenna
- c. circularly polarized with other circular antennas
- d. useful as a UHF receiving antenna
313. The feedpoint presents and ac load to the transmission line called
- a. antenna output impedance
- b. antenna input impedance
- c. feedpoint impedance
- d. center feed impedance
314. A helical antenna is used for satellite tracking because of its
- a. circular polarization
- b. maneuverability
- c. broad bandwidth
- d. good front to back ratio
315. The simplest type of antenna.
- a. Elementary doublet
- b. Half-wave dipole
- c. Quarterwave dipole
- d. 5/8 wavelength dipole
316. Zoning is used with a dielectric antenna in order to
- a. reduce the bulk of the lens
- b. increase the bandwidth of the lens
- c. permit pin-point focusing
- d. correct the curvature of the wavefront from a horn that is too short
317. It is an electrically short dipole
- a. short dipole
- b. quarterwave dipole
- c. half-wave dipole
- d. yagi antenna
318. Cassegrain feed is used with parabolic reflector to
- a. increase the gain of the system
- b. increase the bandwidth of the system
- c. reduce the size of the main reflector
- d. allow the feed to be placed at a convenient point
319. The half-wave dipole is generally referred to as ______.
- a. Yagi antenna
- b. Hertzian antenna
- c. Marconi antenna
- d. Hertz antenna
320. Top loading is sometimes used with an antenna in order to increase its
- a. effective height
- b. bandwidth
- c. beamwidth
- d. input capacitance
321. What is the directivity of a Hertz antenna?
- a. 1.64
- b. 2.18
- c. 2.15
- d. 1.75
322. The standard reference antenna for the directive gain is the _______.
- a. infinitesimal dipole
- b. isotropic antenna
- c. elementary doublet
- d. half-wave dipole
323. An antenna which is one-quarter wavelength long, mounted vertically with the lower end either connected directly to ground or grounded through the antenna coupling network.
- a. loop antenna
- b. hertzian dipole
- c. monopole antenna
- d. turnstile antenna
324. An antenna that is circularly polarized is the
- a. helical
- b. small circular loop
- c. parabolic reflector
- d. Yagi – Uda
325. It is a wire structure placed below the antenna and erected above the ground.
- a. ground plane
- b. counterpoise
- c. ground lines
- d. top hat
326. Which of the following terms does not apply to the Yagi-Uda array?
- a. good bandwidth
- b. parasitic elements
- c. folded dipole
- d. high gain
327. It effectively cancels out the capacitance component of the antenna input impedance.
- a. ground plane
- b. top hat
- c. loading coil
- d. shunt capacitance
328. Indicate which of the following reasons for the use of an earth mat with antenna is false:
- a. impossibility of a good ground conduction
- b. provision of an earth for an antenna
- c. protection of personnel working underneath
- d. improvement of the radiation pattern of the antenna
329. A metallic array that resembles a spoke wheel placed at the top of an antenna, it increases the shunt capacitance to ground reducing the overall antenna capacitance.
- a. loading coil
- b. top loading
- c. series capacitance
- d. series inductors
330. Indicate the antenna that is not wideband:
- a. discone
- b. folded dipole
- c. helical
- d. marconi
331. It is formed when two or more antenna elements are combined to form a single antenna.
- a. antenna elements
- b. antenna array
- c. driven elements
- d. parasitic elements
332. One of the following is not a reason for the use of an antenna coupler:
- a. to make the antenna look resistive
- b. to provide the output amplifier with the correct load impedance
- c. to discriminate against harmonics
- d. to prevent re-radiation of local oscillators
333. It is an individual radiator, such as a half or quarter-wave dipole.
- a. antenna element
- b. antenna array
- c. reflector
- d. director
334. Indicate which of the following reasons for using a counterpoise with antennas is false:
- a. impossibility of a good ground connection
- b. protection of personnel working underneath
- c. provision of an earth for the antenna
- d. rockiness of the ground itself
335. Type of antenna element that is directly connected to the transmission lines and receives from or is driven by the source.
- a. driven array
- b. parasitic array
- c. driven element
- d. parasitic element
336. Which of the following antennas is best excited from a waveguide?
- a. biconical
- b. horn
- c. helical
- d. discone
337. Type of antenna element that is not connected to the transmission lines.
- a. parasitic array
- b. driven array
- c. parasitic array
- d. parasitic element
338. One of the following is very useful as a multi-band HF receiving antenna. This is the:
- a. conical horn
- b. folded dipole
- c. log-periodic
- d. square loop
339. A parasitic element that is longer than the driven element from which it receives energy.
- a. driven element
- b. director
- c. parasitic elements
- d. reflector
340. One of the following consists of non-resonant antennas.
- a. rhombic antenna
- b. folded-dipole antenna
- c. end-fire antenna
- d. broadside antenna
341. A parasitic element that is shorter than its associated driven element.
- a. redirector
- b. director
- c. reflector
- d. parasitic element
342. An ungrounded antenna near the ground.
- a. acts as a single antenna near the ground
- b. is unlikely to need an earth mat
- c. acts as an antenna array
- d. must be horizontally polarized
343. It is a non-resonant antenna capable of operating satisfactorily over a relatively wide bandwidth, making it ideally suited for HF transmission.
- a. turnstile antenna
- b. loop antenna
- c. rhombic antenna
- d. discone antenna
344. A wide – bandwidth multi-element driven array is the ______.
- a. end-fire
- b. log-periodic
- c. yagi
- d. collinear
345. It is a linear array antenna consisting of a dipole and two or more parasitic elements: one reflector and one director.
- a. broadside antenna
- b. end-fire antenna
- c. yagi-uda antenna
- d. phased array antenna
346. An antenna which is consists of a cone that is truncated in a piece of circular waveguide.
- a. pyramidal horn antenna
- b. circular horn antenna
- c. rectangular horn antenna
- d. circular horn antenna
347. Which antenna has a unidirectional radiation pattern and gain?
- a. dipole
- b. ground plane
- c. yagi
- d. collinear
348. An antenna formed by placing two dipoles at right angles to each other, 90 degrees out of phase.
- a. discone antenna
- b. turnstile antenna
- c. bicone antenna
- d. 5/8 wavelength antenna
349. The radiation pattern of collinear and a broadside antenna is ________.
- a. omnidirectional
- b. bidirectional
- c. unidirectional
- d. clover-leaf shaped
350. What is the bandwidth ratio of log-periodic antenna?
- a. 10:1
- b. 5:1
- c. 20:1
- d. 1:10
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