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ECE Objective Questions { Television Engineering }

64. For a global coverage, the minimum number of satellites required is
A. ten
B. one
C. three
D. two

65. When carrier wave is modulated at 100%, its power is increased by ? percent.

66. An RF amplifier stage in a radio receiver noise-limited sensitivity.
A. improves
B. deteriorates
C. has no effect on
D. Amplifiers

67. Medium waves in day time are propagated via
A. ionosphere
B. ground
C. troposphere
D. A is

68. On a clear sky day, the atmosppheric radio noise is strongest
A. during morning hours
B. around mid-day
C. during nights
D. in the afternoon

69.  VHF radio signals are propagated
A. via the ionosphere
B. along the ground
C. through the troposphere
D. microwave channels

70. The atmospheric radio noise
A. increases as the frequency increases
B. decreases as the frequency increases
C. remains constant with change in frequency
D. none of above

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