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You Are On Multi Choice Question Bank SET 1165

58251. The maximum effective aperture of an antenna which is operating at wavelength of 2 m and has directivity of 100 is





58252. The waveguides compared to equivalent transmission lines at low frequency are





58253. The current distribution of a half wave dipole is





58254. In case of static electric field Maxwell's divergence equation states that:





58255. For a reflection co-efficient of 0.5, the value of SWR is





58256. A rectangular waveguide having TE10 mode as dominant mode is having a cut off frequency of 18 GHz for the TE30 mode. The inner broad wall dimension of the rectangular waveguide is





58257. A 50 p characteristic impedance line is connected to a load which shows a reflection coefficients of 0.268. If Vin = 15 volt, then the net power delivered to the load will be





58258. 1 dB is equal to __________ nepier





58259. Cassergain feed is used with a parabolic reflector to





58260. Voltage standing wave pattern in a loss less transmission line with characteristic impedance 50 Ω and a resistive load is shown in the figure. The value of load resistance is





58261. For the same length of arrays, half power beam-width of binomial array





58262. The effective electrical length of an antenna is __________ its physical length





58263. The direction in a Yagi Uda antenna is longer than the radiating element.



58264. The intrinsic impedance of free space





58265. To couple a coaxial line to a parallel to wire line it is best to use a





58266. The shunt admittance of a transmission line is given by





58267. A dipole antenna was radiating with some excitation in free space radiating a certain amount of the power. If this antenna is immersed in a lake where water is non-dissipative but has a dielectric constant of 81, the radiated power with the same excitation will





58268. If short-circuited and open circuited impedances are 5 ohms and 20 ohms, then characteristic impedance is





58269. Electric lines of force do not cross each other because





58270. A person with a receiver is 5 km away from the transmitter. What is the distance that this person must move further to detect at 3 dB decrease in signal strength?





58271. For free space propagation





58272. SHF range is





58273. In figure the voltage distribution on a vertical earthed antenna is represented by





58274. The direction in a Yagi Uda antenna





58275. In cell phone antennas are





58276. Antenna commonly used for microwave links are





58277. For a good conducting medium the intrinsic impedance is





58278. For an ideal antenna, numerical value of directivity must be





58279. The force in a magnetic field is given by F = qvB





58280. An electromagnetic wave is incident normally on a dielectric boundary. It is





58281. According to maximum power transfer theorem, if the load is inductive, the source should be





58282. According to Siegel and Labus, antenna can be treated as





58283. Given figure shows a 90° sector of spherical reflector with vertex 'V', centre of curvature 'C' and equal distances VD, DF, FE and EC. When a beam of EM wave is incident parallel to the axis, all the energy will pass through the region





58284. The value of susceptibility in case of vacuum is taken as





58285. Self impedance is





58286. Equipotential surfaces about a point charge are in which one of the following forms?





58287. __________ will have the least value of relative permeability.





58288. The relative permeability is taken as unity for which of the following?





58289. The disturbance from adjacent power lines is known as





58290. Magnesium is alloyed with conducting materials for antenna primarily with the purpose of





58291. Which of the following term applies to troposcatter propagation?





58292. The effective refraction index of the ionosphere for radio wave is





58293. For space propagation, what will be the electric field strength at receiving antenna



58294. A medium is said to be isotropic when





58295. The radiation resistance of a resonant long wire antenna of half wavelength (λ/2) is given





58296. A uniform wave have components





58297. The measure of mismatch between the load and the transmission line is known as





58298. Ionospheric storm causes an abnormal decrease in the critical frequency.



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