Communication Engineering MCQs with answers Page - 52

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Q. A 1 kW carrier is Amplitude Modulated to a depth of 60%. The total power in the modulated carrier is ?

  • (A) 1 kW
  • (B) 1.06 kW
  • (C) 1.6 kW
  • (D) 1.18 kW

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Q. A carrier is modulated by two modulating waves A and B having modulation index of 0.6 and 0.8 respectively. The overall modulation index is ?

  • (A) 1.0
  • (B) 0.7
  • (C) 0.2
  • (D) 1.4

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Q. An AM signal with a carrier of 6KW produces a modulation of 100% what will be the power produced in each side band ?

  • (A) 1KW
  • (B) 0.15KW
  • (C) 15KW
  • (D) 1.5KW

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Q. The modulation index of an amplitude modulated wave is changed from 0 to 1. The transmitted power is ?

  • (A) Doubled
  • (B) Halved
  • (C) Increased by 50 percent
  • (D) unchanged

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Q. In amplitude modulated system if the total power is 600W and the power in the carrier is 400W, the modulation index ?

  • (A) 0.5
  • (B) 0.75
  • (C) 0.9
  • (D) 1

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Q. The ratio of modulating power to total power at 100% modulation will be ?

  • (A) 2:3
  • (B) 3:1
  • (C) 1:3
  • (D) 3:2

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Q. Before transmission message signal is modulated with carrier signal for : ?

  • (A) Decreasing the height of transmitting antenna
  • (B) Increasing the amplitude of message signal
  • (C) Decreasing the amplitude of message signal
  • (D) Increasing the height of transmitting antenna

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