Communication Engineering MCQs with answers Page - 47

Here, you will find a collection of MCQ questions on Communication Engineering. Go through these questions to enhance your preparation for upcoming examinations and interviews.

To check the correct answer, simply click the View Answer button provided for each question.

Have your own questions to contribute? Click the button below to share your MCQs with others!

+ Add Question

A

Admin • 833.24K Points
Coach

Q. If transmitted power = Pt, modulation index = m1 carrier power = Pc, then total transmitted power in a conventional A.M. system, is given as ?

  • (A) Pt= 2Pc (1+m2/2)
  • (B) Pt= Pc (1+m2/2)
  • (C) Pt= 0.5Pc (1+m2/2)
  • (D) Pt= 0.3Pc (1+2/2)

A

Admin • 833.24K Points
Coach

Q. An AM radio station operating at 530KHz is permitted to broadcast audio frequencies up to 5KHz, the upper and lower side frequencies are ?

  • (A) f USB = 535KHz, f LSB = 525KHz
  • (B) f USB = 525KHz, f LSB = 535KHz
  • (C) f USB = 535KHz, f LSB = 535KHz
  • (D) f USB = 525KHz, f LSB = 525KHz

A

Admin • 833.24K Points
Coach

Q. When the modulating frequency is doubled the modulation index is halved, and the modulating voltage remains constant. The modulation system is: 1 Amplitude 2 Phase Modulation 3 Frequency Modulation ?

  • (A) Any of I, II or III
  • (B) Only II
  • (C) Only III
  • (D) Only I

A

Admin • 833.24K Points
Coach

Q. Noise has the greatest effect in a communication system when if interferes with the signal______ ?

  • (A) In the transducer
  • (B) In the transmitter
  • (C) In the receiver
  • (D) In the channel

A

Admin • 833.24K Points
Coach

Q. In case of channel length modulation ?

  • (A) Output current increases with output voltage
  • (B) Output current decreases with output voltage
  • (C) Output current increases with input voltage
  • (D) Output current decreases with input voltage

A

Admin • 833.24K Points
Coach

Q. In FM signal with a modulation index mF is passed through a frequency Tripler. The wave in the output of the Tripler. The wave in the output of the Tripler will have a modulation index of ?

  • (A) Mf
  • (B) Mf/3
  • (C) Mf/9
  • (D) 3mf

A

Admin • 833.24K Points
Coach

Q. Which one of the following statements is NOT true ?

  • (A) A frequency modulated signal is produced when a modulating signal m (t) is integrated and applied to a phase modulator
  • (B) For a sinus dally modulated FM carrier, it is possible that for particular values of the modulation index ?, all the power in the carrier
  • (C) When carrier to noise ratio is high, an increase in the transmission bandwidth decreases the figure of merit of an FM system
  • (D) A phase modulated signal is produced when a modulating signal m(t) is differentiated and applied to a frequency modulator

A

Admin • 833.24K Points
Coach

Q. If the radiated power of AM transmitter is 10 KW, the power in the carrier for modulation index of 0.6 is nearly ?

  • (A) 8.24 KW
  • (B) 9.26 KW
  • (C) 8.47 KW
  • (D) 9.6 KW

A

Admin • 833.24K Points
Coach

Q. If modulation index is increased to root 2 times, what would be the effective e transmitted power ?

  • (A) Equal to carrier power
  • (B) Half of carrier power
  • (C) 2 times of carrier power
  • (D) root 2 times of carrier power

A

Admin • 833.24K Points
Coach

Q. If a single-tone amplitude modulated signal at a modulation depth of 100% transmits a total power of 15 W. the power in the carrier component is ?

  • (A) 5 W
  • (B) 10 W
  • (C) 12 W
  • (D) 15 W

Add MCQ in this Category

If you want to share an MCQ question in this category, it's a great idea! It will be helpful for many other students using this website.

Share Your MCQ

Browse Categories

Click on category to learn MCQs of that category.