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MCQs

Total Questions : 130 | Page 2 of 13 pages
Question 11. Which of the following methods may be used to convert A.C. system to D.C.?
  1.    Rectifiers
  2.    Motor converters
  3.    Motor-generator sets
  4.    Rotary converters
  5.    All of the above
 Discuss Question
Answer: Option E. -> All of the above
Question 12. In a phase-shift control method, the phase shift between anode and grid voltages can be achieved by means of
  1.    Shunt motor
  2.    Synchronous motor
  3.    Induction regulator
  4.    Synchronous generator
 Discuss Question
Answer: Option C. -> Induction regulator
Question 13. On which of the following factors the number of phases for which a rectifier should be designed depends?
  1.    The voltage regulation of the rectifier should be low
  2.    In the output circuit there should be no harmonics
  3.    The power factor of the system should be high
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 14. With a motor converter it is possible to obtain D.C. voltage only upto
  1.    200-100 V
  2.    600-800 V
  3.    1000-1200 V
  4.    1700-2000 V
 Discuss Question
Answer: Option D. -> 1700-2000 V
Question 15. A commutating rectifier consists of commutator driven by
  1.    An induction motor
  2.    A synchronous motor
  3.    A D.C. series motor
  4.    A D.C. shunt motor
 Discuss Question
Answer: Option B. -> A synchronous motor
Question 16. In a mercury pool rectifier, the voltage drop across its electrodes
  1.    is directly proportional to load
  2.    is inversely proportional to load
  3.    varies exponentially with the load current
  4.    is almost independent of load current
 Discuss Question
Answer: Option D. -> is almost independent of load current
Question 17. When a rectifier is loaded which of the following voltage drops take place ?
  1.    Voltage drop in transformer reactance
  2.    Voltage drop in resistance of transformer and smoothing chokes
  3.    Arc voltage drop
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 18. In a mercury arc rectifier, the anode is usually made of
  1.    copper
  2.    aluminium
  3.    silver
  4.    graphite
  5.    tungsten
 Discuss Question
Answer: Option D. -> graphite
Question 19. Which of the following metals is generally manufactured by electrolysis process?
  1.    Load
  2.    Aluminium
  3.    Copper
  4.    Zinc
  5.    None of the above
 Discuss Question
Answer: Option B. -> Aluminium
Question 20. If cathode and anode connections in a mercury arc rectifier are inter changed
  1.    The rectifier will not operate
  2.    Internal losses will be reduced
  3.    Both ion and electron streams will move in the same direction
  4.    The rectifier will operate at reduced efficiency
 Discuss Question
Answer: Option A. -> The rectifier will not operate

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