58301. Which of the following is best excited from a waveguide?
58302. In a vertical earthed antenna the base input impedance will be inductive for a height
58303. The frequencies in ultra high frequency range are propagated by means of __________ waves
58304. Maximum effective aperture of a antenna is
58305. Voltage standing wave pattern in a loss less transmission line with characteristic impedance 50 Ω and a resistive load is shown in the figure.
Reflection coefficient is given by
58306. Which of the following wave remains unaffected during day and night?
58307. A microwave link uses only line-of-sight propagation.
58308. The phase velocity of an EM wave propagating in a hollow metallic rectangular waveguide in the TE10 mode is
58309. The electric field of an EM wave propagating in the z direction given by
The wave is
58310. Which of the following waves do not exist in waveguides?
58311. The bidirectional pattern of a broadside array can be converted into unidirectional by
58312. VLF waves are used for communication system because
58313. A biological method of soil conservation is?
58314. Which one is correct option?
58315. A vertical loop antenna, like a horizontal dipole, is vertically polarised.
58316. The attenuation in a waveguide near the cut off frequency is
58317. The electric flux and field intensity inside a conducting sphere is
58318. T.V. antennas are usually
58319. Measurement of radiation resistance by reflection method is suitable for
58320. A lossless transmission line is connected to two identical voltage source as shown in figure.
The impedance measured at the midpoint AA' is
58321. A loss less transmission line is terminated in a load which reflects a part of the incident power. The measured VSWR is 2. The percentage of the power that is reflected back is
58322. A higher directivity is specified by
58323. The best excited reflector from a wave guide is
58324. Long distance short-wave radio broadcasting uses
58325. The affect of ground on radiation pattern is to
58326. If a electromagnetic signal is incident at 0° in a waveguide then at other port of waveguide we will get
58327. An antenna having a high Q has
58328. The polarization of dielectric materials results in
58329. For a quarter wave transformer, characteristic impedance is related with input and load impedances as
58330. An electron when placed midway between two equal and opposite charges will
58331. Which of the following is the abnormal phenomena observed in the ionosphere?
58332. In a loss-less transmission line
58333. Which layer is least important in high frequency propagation?
58334. Which of the wave remains unaffected whether it is a day or night?
58335. Which of the following is not an omnidirectional antenna?
58336. The unit of magnetic flux density is
58337. In a waveguide if TE mode exist for z direction propagation, then
58338. Critical frequency of a layer in ionosphere
58339. Distances near the skip distance should be used for sky-wave propagation
58340. End fire array has a dipole spacing of λ/2.
58341. Which one of following is correct for broadside array?
58342. The first Hun invasion took place during the reign of?
58343. Curl of gradient A is
58344. What does the expression represent?
58345. A conductor is said to be perfect if it has __________ conductivity
58346. The simplest standing wave is due to the value of reflection co-efficient is
58347. In terrestrial microwave links, the number of 'fades' per unit increases as
58348. Bandwidth of an antenna is related with where Q is quality factor