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.
A.100
B.150
C.50
D.0
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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