51. In a FM waveform, the side bands are spaced at intervals equal to
52. A receiver having an RF amplifier and an IF of 450 kHz, has Q of the coils 65 and an incoming frequency of 1200 kHz. The image rejection of the receiver is
53. A padder is basically a/an
54. In a radio receiver, the local oscillator is always tuned to a frequency higher than the incoming frequency to
55. When a superheterodyne receiver is tuned to 455 kHz, its local oscillator provides a mixer with the input at 1010 kHz. The image frequency is
56. In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. The image frequency at 1000 kHz will be
57. In a superheterodyne receiver, the IF stage has better selectivity than RF stage because
58. An arbitrary signal m (t) has zero average value and it is bandlimited to 3.2 kHz. It is sampled at the rate of 8 K samples/S. The samples are passed through an ideal bandpass filter with centre frequency of 32 kHz and bandwidth of 6.4 kHz. The output of band pass filter is
59. The purpose of incorporating a pre-selector stage in a receiver is to
60. Vividh Bharati programme is transmitted in
61. In a receiver, which of the following device has RF input but IF output?
62. The IF stage of a receiver employs
63. A FM signal with modulation index Mf is passed through a frequency doubler. The wave in the output of the doubler will have modulation index of
64. Double spotting in a receiver is due to
65. Three point tracking can be achieved with
66. In a transistor receiver, the use of FET as the first stage amplifier is likely to
67. The household radio receiver uses
68. The source of which of the following noise is different from that of the remaining?
69. A receiver having poor IF selectivity will also have poor
70. Statement 1
Diode is the most common device used for demodulation.
Statement 2
A discriminator is a FM detector.
71. The selectivity curve of a standard receiver is represented by
72. Which of the following statement about the advantage of phase discriminator over the slope detector is false?
73. Fidelity of a receiver represents
74. Which of the following produces upper and lower side frequencies?
75. The passband of the tuned circuits of a radio receiver should be equal to