Introduction To Satellite Communication – 2 – 2

56. In satellite communication 6/4 GHz band by the disadvantages :

(a) There is no absorption by the rain
(b) Sky noise is low
(c) More interference from others users
(d) Fewest propagation problems

ANSWER

EXPLANATION

57. One of the following can not be used to demodulate SSB :

(a) product detector
(b) diode balanced modulator
(c) bipolar transistor balanced modulator
(d) complete phase shift generator

ANSWER

EXPLANATION

58. The commonly employed filter in SSB generation is :

(a) high pass filter
(b) mechanical filter
(c) RC filter
(d) LC filter

ANSWER

EXPLANATION

59. The following is an indirect method of generating FM :

(a) Reactive FM modulator
(b) Armstrong modulation
(c) Varactor diode modulation
(d) Reactance BJT modulator

ANSWER

EXPLANATION

60. The modulation index of an AM signal is increased from 0 to 1. The carrier power :

(a) Remains unchanged
(b) Gets doubled
(c) Increased by 50%
(d) Gets quadrupled

ANSWER

EXPLANATION

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