26. In standing wave pattern on a transmission line
27. If the bandwidth is increased by 2, the γFM γAM (where γ is the ratio of SNR of output to SNR at input, FM is frequency modulation and AM is amplitude modulation) is increased by a factor of
28. Kanishka organised the fourth Buddhist Council with a view to?
29. A carrier wave carries information.
30. Frequency shift keying is used mostly in
31. It is desired that transmission line and load should match for a range of frequencies. The best method is
32. Which of the following has the highest input impedance?
33. In a fascimile reproduction time to scan one line is 2 ms. If it has 4% blanking, the visible trace time is
34. Consider the following statements The amplitude of an FM wave is constantFM is more immune to noise than AMFM broadcasts operate in upper VHF and UHF frequency rangesFM transmitting and receiving equipments are simpler as compared to AM transmitting and receiving equipments Which of the above are correct?
35. Signal to noise ratio of microphone is defined as the ratio of output when the sound pressure is __________ to the output in the absence of any sound signal.
36. A generator is feeding power to a transmission line of characteristic impedance Z0. The line is terminated in impedance ZL. Standing waves will be set up if
37. In sound recording the degree of pre-emphasis is about 6 dB/ octave.
38. Space wave may be a direct wave or wave reflected from earth.
39. Radio broadcasts are generally
40. If the frequency of a wave 20 Hz, the time period is
41. Which of the following is taken as reference antenna for directive gain?
42. Push pull amplifier is
43. When the channel is noisy, producing a conditional probability of error p = 0.5; the channel capacity and entropy function would be, respectively,
44. In CCIR-B system, the time between start of one H syn. pulse and next is
45. Counterpoise is used in coils having
46. For an ideal 3000 Hz channel, S/N ratio is
47. Which of the following types of noise assumes greater importance at high frequencies?
48. In transistor radio receivers the number of IF amplifier stages are
49. To relay outdoor remotely located live programs, TV transmitter use
50. If each short element of signal occupies 20 ms, the speed is