76352. To study electromagnetic radiations from astronomical objects, radio astronomers use
76353. Radar reciever has high sensitivity and low noise figure
76354. For a waveguide, which of the following statements is wrong?
76355. A transmission line discontinuity is defined as any interruption in the uniformity of the line.
76356. Interference generated by electrical equipment and automobile ignition systems when observed closed to earth is
76357. The earliest uses of electromagnetic waves were
76358. At millimeter wavelength the favoured mode in circular wave guide is
76359. In laboratory experiment the output from reflex klystron is moderated by square wave because
76360. Klystron amplifier is not used to amplifier very weak microwave signals due to
76361. Which of the following modes in circular waveguides are circularly symmetric?
76362. Which of the following lines behaves as infinite line?
76363. A rectangular waveguide has two stubs each length connected at the source end. The stubs are short circuted. Then
76364. Performance of a PIN diode switch is represented by
76365. A circular waveguide has an infinite set of TE and TM modes.
76366. In TE and TM modes of rectangular waveguides having propagation in z direction
76367. Which of the following are true for magic tee in the given figure select the answer as per given codes S13 = S23S14 = S24S12 = 0S34 = 0
76368. The manufacturing technique used to manufacture strip type transmission line is
76369. An electromagnetic wave can be completely guided by a dielectric rod or slab.
76370. Most electromagnetic transmission in rectangular wave-guide uses
76371. Loading of a line means
76372. The frequency of oscillations obtained from a reflex klystron depends mainly on
76373. The main advantage of TWT over klystron is
76374. In a TWT the phase velocity of the axial component of the field on the slow wave structure is kept
76375. Assertion (A): Two equal and opposite travelling waves result in a standing wave.Reason (R): The ratio of maximum to minimum value of a standing wave is called SWR.
76376. When a wave reaches an open circuit
76377. Assertion (A): In circular waveguide the attenuation of TE01 mode decreases as the operating frequency increases.Reason (R): The wall currents in a circular waveguide in TEQ1 mode are completely circumferential.
76378. Consider the following statements Usable bandwidth of ridge wave guide is more than that of rectangular waveguide.For a given value of TM10 cutoff frequency the cross section of ridge wave guide is lesser that that of rect angular waveguide.Ridge wave guide has higher conductor losser than a rectangular waveguide.Ridge guide has higher conductor losser than a rectangular waveguide. Which of the above statements are correct?
76379. Directive gain of elementary doublet is
76380. Consider the following statements, SWR of a transmission line is infinite when the load is a short circuita complex impedancean open circuita pure reactance Which of the above statements are correct?
76381. In a reflex klystron the output frequency is determined primarily by resonant frequency of cavity.
76382. The arrangement in the given figure is a hybid T. If 100 mW fed at port 1, the power reflected back at port 1 is
76383. In TE10 mode the largest electric field in a rectangular wave guide, occurs
76384. Which modes of circular wave guides have circular symmetry?
76385. In rectangular waveguides the ratio of width to height is about
76386. In the given figure the circuits for input impedance of a microwave device with output ports match terminated. The device is
76387. Which of these statements is correct?
76388. A rectangular waveguide has width a. Then at the cutoff frequency (with corresponding wave length λc)
76389. In a rectangular waveguide cutoff wavelength for TE10 mode is 8 cm. Then cutoff wavelength for TE20 mode is
76390. In a coaxial line
76391. If a and b are the width and height of rectangular wave-guide the cut off wavelength λc for TE20 mode is equal to
76392. A TEM wave is incident normally on a perfect conductor. The E and H fields at boundary will respectively be
76393. Frequency range for satellite communication is
76394. For a given operating frequency a waveguide has more power handling capacity than a coaxial line.
76395. VSWR = Emax/Emin.
76396. Power monitor and reflectometer use the principle of
76397. A line slightly longer than length and short circuited at far end behaves as
76398. Compared to coaxial lines, the advantages of wave guides are
76399. Standard mismatches are used to calibrate SWR and impedance measuring equipments.
76400. As compared to LED, LASER has higher emission efficiencyno tuning arrangementnarrow spectral widthprovision for confinement Of these statements
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