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MCQs

Total Questions : 402 | Page 1 of 41 pages
Question 1. 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
  1.    1010 kHz
  2.    1455 kHz
  3.    1910 kHz
  4.    545 kHz
 Discuss Question
Answer: Option C. -> 1910 kHz
Answer: (c).1910 kHz
Question 2. The ending part of the popular teleserial Mahabharat will be beamed to the viewers
  1.    WESTAT
  2.    INSAT-IC
  3.    ARABSAT
  4.    INSAT-ID
 Discuss Question
Answer: Option C. -> ARABSAT
Answer: (c).ARABSAT
Question 3. A communication satellite is a repeater between
  1.    a transmitting station and a receiving station
  2.    a transmitting station and many receiving station
  3.    many transmitting station and many receiving station
  4.    none
 Discuss Question
Answer: Option C. -> many transmitting station and many receiving station
Answer: (c).many transmitting station and many receiving station
Question 4. While keeping the down-link frequency constant, the diameter of a satellite antenna is reduced by half. To offer the same EIRP over the increased coverage area, the RF output power has to be increases by a factor of
  1.    2
  2.    4
  3.    8
  4.    16
 Discuss Question
Answer: Option B. -> 4
Answer: (b).4
Question 5. The most effective anti jamming technique is
  1.    frequency hopping
  2.    spread-spectrum modulation
  3.    key leverage
  4.    once-only key
 Discuss Question
Answer: Option B. -> spread-spectrum modulation
Answer: (b).spread-spectrum modulation
Question 6. The maximum signal propagation time of a geosynchronous satellite transmission is about __________ millisecond.
  1.    540
  2.    270
  3.    135
  4.    1080
 Discuss Question
Answer: Option B. -> 270
Answer: (b).270
Question 7. The life time of a geosynchronous communication
  1.    5
  2.    10
  3.    20
  4.    50
 Discuss Question
Answer: Option B. -> 10
Answer: (b).10
Question 8. Assuming earth to be a sphere of radius 6400 km and height of a geosynchronous satellite above Earth as 36000 km, the velocity of a geosynchronous satellite is __________ km/hr.
  1.    28000
  2.    15000
  3.    36000
  4.    11100
 Discuss Question
Answer: Option D. -> 11100
Answer: (d).11100
Question 9. The noise temperature of sky is about __________ °K.
  1.    100
  2.    273
  3.    0
  4.    30
 Discuss Question
Answer: Option D. -> 30
Answer: (d).30
Question 10. In the context of error detection in satellite transmission, ARQ stands for
  1.    Automatic Repeat Request
  2.    Automatic Relay Request
  3.    Accelerated Recovery Request
  4.    Automatic Radiation Quenching
 Discuss Question
Answer: Option A. -> Automatic Repeat Request
Answer: (a).Automatic Repeat Request

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