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MCQs

Total Questions : 100 | Page 2 of 10 pages
Question 11. Three point tracking can be achieved with
  1.    gang condenser
  2.    variable selectivity
  3.    paddar capacitor
  4.    any of the above
 Discuss Question
Answer: Option B. -> variable selectivity
Answer: (b).variable selectivity
Question 12. 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. In receivers operating upto the limit of shortwave broadcasting the local oscillator often used is
  1.    Armstrong oscillator
  2.    Colpitts oscillator
  3.    Clapp oscillator
  4.    Ultra Audio oscillator
 Discuss Question
Answer: Option A. -> Armstrong oscillator
Answer: (a).Armstrong oscillator
Question 13. An unmodulated voltage 10 V effective is applied to a dioxide detector in which load resistance is 4 x 10¯⁵ ohms. A micrometer shows that the rectified DC current in this resistance is 30 A. The efficiency of detection is
  1.    34%
  2.    55.5%
  3.    68.8%
  4.    84.7%
 Discuss Question
Answer: Option D. -> 84.7%
Answer: (d).84.7%
Question 14. RF amplifiers are used in radio receivers for
  1.    better sensitivity
  2.    improved signal-to-noise ratio
  3.    better coupling of receiver to the antenna
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Answer: (d).all of the above
Question 15. In an FM signal, the power
  1.    increases as the modulation index increases
  2.    reduces as the modulation index increase
  3.    increases as the modulation index decreases
  4.    remains constant when the modulation index increases
 Discuss Question
Answer: Option D. -> remains constant when the modulation index increases
Answer: (d).remains constant when the modulation index increases
Question 16. Which of the following noise does not occur in transistors?
  1.    Partition noise
  2.    Shot noise
  3.    Flicker noise
  4.    Resistance noise
 Discuss Question
Answer: Option A. -> Partition noise
Answer: (a).Partition noise
Question 17. Noise generated in a resistor is also known as
  1.    partition noise
  2.    white noise
  3.    thermal noise
  4.    shot noise
 Discuss Question
Answer: Option C. -> thermal noise
Answer: (c).thermal noise
Question 18. In a superheterodyne receiver
  1.    the IF stage has better selectivity than RF stage
  2.    the RF stage has better selectivity than IF stage
  3.    the RF stage has same selectivity than IF stage
  4.    none of the above
 Discuss Question
Answer: Option A. -> the IF stage has better selectivity than RF stage
Answer: (a).the IF stage has better selectivity than RF stage
Question 19. The noise generated by a resistor depends upon
  1.    its resistance value
  2.    its operating temperature
  3.    both its resistance value and operating temperature
  4.    none of the above
 Discuss Question
Answer: Option B. -> its operating temperature
Answer: (b).its operating temperature
Question 20. Which of the following is used to provide tracking between RF amplifier and local oscillator stages of receiver?
  1.    Variable tuning inductor
  2.    Ganged tuning inductor
  3.    Variable capacitor
  4.    Variable preset
 Discuss Question
Answer: Option B. -> Ganged tuning inductor
Answer: (b).Ganged tuning inductor

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