Communication Engineering MCQs with answers Page - 49

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Q. An audio frequency of 15 KHz is frequency modulated with a deviation of 75 KHz the resulting bandwidth is ?

  • (A) 180 KHz
  • (B) 150 KHz
  • (C) 210 KHz
  • (D) 240 KHz

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Q. In FM modulation system, the number of significant sideband depends on ?

  • (A) Modulation voltage
  • (B) Modulation frequency
  • (C) The frequency deviation
  • (D) Modulation index

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Q. In frequency modulation. If the amplitude of the modulating signal decreases, the carrier frequency ?

  • (A) Decreases
  • (B) Increased
  • (C) Is zero
  • (D) Remains content

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Q. In case of which of the following, an increase on the modulation index leads to increase in bandwidth ?

  • (A) PM
  • (B) FM
  • (C) AM
  • (D) Both A. and B.

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Q. The modulated carrier average power in an FM system is equal to the ?

  • (A) Modulating signal power
  • (B) Sum of the modulated signal power and the un modulated carrier power
  • (C) Difference between the modulating signal power and the unmodulated carrier power
  • (D) Unmodulated carrier power

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Q. A FM wave is given in v = 12 sin ( 6 x 108t +5 sin 1250 t ). Its carrier frequency is ?

  • (A) 60.0 MHz
  • (B) 95.5 MHz
  • (C) 125.0 MHz
  • (D) 276.3 MHz

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Q. Which of the following statement is correct ?

  • (A) The frequency of carrier signal depends on frequency of modulating signal
  • (B) The frequency of carrier signal is lower than that of modulating signal
  • (C) The frequency of carrier signal and modulating signal are equal
  • (D) The frequency of carrier signal is very high compare to that of modulating signal

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Q. If the total power of an amplitude modulated signals is 600 W and the carrier power is 400W, the modulation index is ?

  • (A) 0.75
  • (B) 0.5
  • (C) 0.25
  • (D) 1

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Q. What would be the effect on transmitted power of an AM wave if its modulation index changes to 1 from 0 ?

  • (A) Will be halved
  • (B) Will remain unchanged
  • (C) Will be quadrupled
  • (D) Will be increased by 50%

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Q. On increasing modulation index : ?

  • (A) Transmitted power is constant in AM but increases in FM
  • (B) Transmitted power constant in FM but increases in AM
  • (C) Transmitted power decreases in both FM and AM
  • (D) Transmitted power increases in both FM and AM

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