Communication Skill MCQs

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R

Ram Sharma • 193.88K Points
Coach

Q 1. One of the advantages of base modulation over collector modulation of a transistor class C amplifier is

  • (A) improved efficiency
  • (B) better linearity
  • (C) high power output per transistor
  • (D) the lower modulating power requirement
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Correct Answer: Option (D)
Explanation:
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V

Vijay Sangwan • 28.62K Points
Instructor II

Q 2. The direction of rotation of a CD is

  • (A) clockwise
  • (B) anticlockwise
  • (C) clockwise or anticlockwise depending on frequency of data stored
  • (D) mostly anticlockwise but some times clockwise
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Correct Answer: Option (B)
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V

Vinay • 28.75K Points
Instructor II

Q 3. Leak type bias is used in plate modulated class C amplifier to

  • (A) increase the bandwidth
  • (B) prevent over modulation
  • (C) prevent excessive grid current
  • (D) prevent tuned circuit damping
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Correct Answer: Option (C)
Explanation:
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V

Vijay Sangwan • 28.62K Points
Instructor II

Q 4. A buffer amplifier is

  • (A) a double-tuned amplifier
  • (B) a high gain d.c. amplifier
  • (C) a cathode follower stage
  • (D) none of the above
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Correct Answer: Option (B)
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V

Vinay • 28.75K Points
Instructor II

Q 5. In a FM receiver, amplitude limiter

  • (A) amplifiers low frequency signals
  • (B) reduces the amplitude of signals
  • (C) eliminates any change in amplitude of received fm signals
  • (D) none of the above
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Correct Answer: Option (C)
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V

Vikash Gupta • 33.56K Points
Instructor I

Q 6. The characteristic impedance of a twin wire feeder used for TV signals is about

  • (A) 1000 ohm
  • (B) 500 ohm
  • (C) 300 ohm
  • (D) 100 ohm
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Correct Answer: Option (C)
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V

Vijay Sangwan • 28.62K Points
Instructor II

Q 7. PAM stands for

  • (A) pulse analogue modulation
  • (B) phase analogue modulation
  • (C) pulse amplitude modulation
  • (D) phase amplitude modulation
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Correct Answer: Option (C)
Explanation:
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G

Gopal Sharma • 38.32K Points
Coach

Q 8. The maximum power output of a standard A earth station over the total band allocated to satellite communication is about

  • (A) 0.5 kw
  • (B) 8 kw
  • (C) 20 kw
  • (D) 50 kw
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Correct Answer: Option (A)
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R

Ranjeet • 34.60K Points
Instructor I

Q 9. In EM waves, polarization

  • (A) is always vertical in an isotropic medium
  • (B) is caused by reflection
  • (C) is due to transverse nature of waves
  • (D) results from longitudinal nature of waves
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Correct Answer: Option (C)
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G

Gopal Sharma • 38.32K Points
Coach

Q 10. In practical commercial FM system, channel bandwidth is

  • (A) 150 khz
  • (B) 100 khz
  • (C) 88 mhz
  • (D) 108 mhz
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Correct Answer: Option (A)
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