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MCQs

Total Questions : 145 | Page 5 of 15 pages
Question 41. . Point out the FALSE statement. Dominant mode of propagation is preferred with rectangular waveguides because
  1.    it can be propagated in a guide that is too small to propagate any other mode
  2.    there is no energy loss through the spurious generation of other modes
  3.    it is the easiest to excite
  4.    resulting impedance can be matched to the loaddirectly
 Discuss Question
Answer: Option D. -> resulting impedance can be matched to the loaddirectly
Question 42. .  Indicate the FALSE statement : As compared to rectangular waveguides, circular ones
  1.    need much bigger cross-sectional area for carrying thesame signal
  2.    have lower attenuation especially at frequencies in excess of 1 GHz
  3.    are more difficult to manufacture
  4.    are easier to join together in the usual plumbing fashion
 Discuss Question
Answer: Option C. -> are more difficult to manufacture
Question 43. . For handling high powers, it is best to use
  1.    rectangular waveguide
  2.    stripline
  3.    coaxial cable
  4.    microstrip
 Discuss Question
Answer: Option A. -> rectangular waveguide
Question 44. . The cavity magnetron employs strapping in order to
  1.    prevent mode jumping
  2.    reduce frequency pushing and pulling
  3.    ensure bunching
  4.    permit better dissipation of heat
 Discuss Question
Answer: Option A. -> prevent mode jumping
Question 45. . Indicate the FALSE statement :Frequency-agile or dither-tuned magnetron
  1.    has a movable piston for changing its operating frequency
  2.    can be easily jammed
  3.    may be conventional or coaxial
  4.    is capable of sending a series of pulses each of which is at a different frequency
 Discuss Question
Answer: Option B. -> can be easily jammed
Question 46. . Which statement regarding voltage tunable magnetrons (VTMs) is wrong?
  1.    they use high-Q cavities
  2.    they have an extra injection electrode to help bunching
  3.    their operating frequency can be varied over an octave by adjusting anode votage
  4.    they use cold cathodes
 Discuss Question
Answer: Option A. -> they use high-Q cavities
Question 47. . The cut-off frequency in a waveguide means
  1.    longer waves will not propagate significantly
  2.    determine the dimensions of waveguide
  3.    frequency at which no transmission takes place.
  4.    None of above
 Discuss Question
Answer: Option A. -> longer waves will not propagate significantly
Question 48. . For a standard X-band waveguide of cross-sectional dimension 2.286 cm x 1.016 cm, the cut-off wavelength for a TEio mode is ___ cm.
  1.    2.286
  2.    2.032
  3.    4.572
  4.    3.02
 Discuss Question
Answer: Option C. -> 4.572
Question 49. .  The signal delay caused when a wave travels a distance Z metres through a hollow wave guide is where VPh' V and Vo represent phase gr velocity, group velocity and free space velocity (m/sec) respectively. given by
  1.    Z/Vph
  2.    ZN
  3.    Z/Vo
  4.    ZN'.V
 Discuss Question
Answer: Option B. -> ZN
Question 50. . Velocity factor of a transmission lines is 0.8 Electromagnetic waves travel down this line with a velocity of
  1.    3 x 108 m/s
  2.    3.75 m/s
  3.    2.4 x 108 m/s
  4.    none of these
 Discuss Question
Answer: Option C. -> 2.4 x 108 m/s

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