51. When the length of antenna is a whole wavelength A. The radiation at right angles is zero B. The radiation at right angles is maximum C. The radiation is zero in all directions D. The radiation is maximum in all directions Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
52. Under ordinary circumstances, impulse noise can be reduced in A. FM only B. AM only C. Both AM and FM D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
53. Which of the following is used to generate PDM? A. Free running multi-vibrator B. Monostable multi-vibrator C. JK flip-flop D. Schmitt trigger Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
54. A zero mean white Gaussian noise is passed through an ideal low pass filter of bandwidth 10 kHz. The output of the samples so obtained would be A. Correlated B. Statistically independent C. Uncorrelated D. Orthogonal Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
55. A three stage telephone switching structure is to have 128 input and 128 output terminals. There are 16 first stage and 16 third stage matrices. To avoid blocking the number of intermediate paths required is A. 16 B. 15 C. 8 D. 1 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
56. For a low level AM system, the amplifiers modulated stage must be A. Linear devices B. Harmonic devices C. Class C amplifiers D. Non-linear devices Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
57. In case of low level amplitude modulation system, the amplifiers following the modulated stage must be A. Class C amplifiers B. Linear devices C. Non-linear devices D. Harmonic devices Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
58. Commercial Frequency deviation of FM is A. 70 kHz B. 75 kHz C. 80 kHz D. 65 kHz Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
59. An FM radio receiver which is tuned to a 91.6 MHz broadcast station may receive an image frequency of __________ MHz. A. 102.3 B. 113 C. 70.2 D. 80.9 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
