76251. The attenuation characteristics of a loaded line is similar to that of
76252. A microstrip line has ∈r = 9. The normalised wavelength is about
76253. If the repeller voltage in a klystron oscillator is increased the transit time of electron
76254. In which of the following devices can the operation be visualised in terms of a series feedback loops?
76255. The first and second subscripts in models of circular waveguides depict
76256. In which mode of circular waveguide does the attenuation continuously decrease as frequency is increased?
76257. In which mode of rectangular waveguide are all field components zero?
76258. A microstrip line has dielectric having relative permittivity ∈r. The effective dielectric constant is
76259. The rotation of direction of E field of a linearly polarized wave passing through a magnetised ferric medium is called
76260. If air pressure in a rectangular waveguide is increased the maximum power handling capacity
76261. A directional coupler is used to determine
76262. A square waveguide carries TE11 mode whose axial magnetic field is given by Hz = H0 , where the guide dimensions are in cms. The cut off frequency of the mode is
76263. For air filled circular waveguides
76264. A short circuited stub is preferred to an open circuited stub because an open circuited stub
76265. If the peak transmitted power in a radar is increased by a factor 81, the maximum range is increased by a factor of
76266. Radar is essentially an echo ranging system
76267. In Gunn diode electrons are transferred from
76268. Consider the following statements about radar Beacon It is also called transponder.It includes pulse transmitter, receiver and antenna.It replies with full power even when the signal receives is weak. Which of the above statements are correct?
76269. Consider the following statements about instrument landing system of aircraft It ensures correct landing under conditions of low visibility.It consists of runaway localizer, glide path equipment and marker beacons.It is basically a blind landing system. Which of above statements are correct?
76270. Effect of loading of line is
76271. Which mode has the minimum cutoff frequency in rectangular wave guides?
76272. As compared to dimensions of most feeds, the skin depth at microwave frequencies is
76273. In microwave communication links the fading due to rain occurs. The methods to solve this problem include
76274. A microwave connector should have high SWR.
76275. Assertion (A): A small section of high impedance line is equivalent to a series inductance.Reason (R): A small section of a low impedance line is equivalent to a series resistance.
76276. Assertion (A): Bolometer is frequently used in microwave power measurement.Reason (R): In a bolometer the input microwave power causes a change in resistance.
76277. The radiation resistance of a doublet antenna of length dl is proportional to
76278. Which of the following statements is not correct regarding modes of electromagnetic energy transmission?
76279. Oscillations are obtained from a reflex klystron only for combinations of anode voltage and repeller voltage that give a favourable transit time.
76280. In the given figure shows a 10dB directional coupler. If power input at port 1 is 100 mW, power output at port 3 is
76281. The noise figure of klystron amplifier is about
76282. Which one of the following is true for EM wave propagation through rectangular waveguide of cross-section 2a x a
76283. In the given figure the line voltage after a number of reflections will be
76284. Which one of the following is also called 'rat race'?
76285. Radar principle is used in
76286. In an optional fiber the refractive index of cladding material should be
76287. In microwave circuits, a mode transducer is used to
76288. A waveguide connected to a circularly polarized antenna must be able to efficiently propagate both vertically and horizontally polarised waves.
76289. Which of the following is not used as a microwave mixer or detector?
76290. Integrated fin line can be utilized as a medium for constructing millimeter wave circuits.
76291. The secondary constants of a line are
76292. In a loss less line the propagation constant is equal to
76293. A rectangular wave guide has two stubs each of length connected at the source end. The stubs are circuited. Then the stubs present
76294. Slotted line can be used for measurement of high frequencies
76295. In a waveguide the dielectric region is generally
76296. In directional coupler of the given figure, the terms |S14| and |S23| of scattering matrix are nearly
76297. A line is excited by a 100 V, 200 ohm source and is terminated by 100 Ω resistance. If the voltage on line reaches steady value in 80 ns, the natural resonant frequency is
76298. A line of length slightly longer than and open circuited at far end behaves as
76299. The most commonly used magnetron is
76300. The effect of earth's magnetic field on radiowaves is minimum when
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