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MCQs

Total Questions : 130 | Page 5 of 13 pages
Question 41. The advantage of mercury arc rectifier is that
  1.    it is light in weight and occupies small floor space
  2.    it has high efficiency
  3.    it has high overload capacity
  4.    it is comparatively noiseless
  5.    all of the above
 Discuss Question
Answer: Option E. -> all of the above
Question 42. The potential drop in the arc, in a mercury arc rectifier, varies
  1.    0.05 V to 0.2 V per cm length of the arc
  2.    0.5 V to 1.5 V per cm length of the arc
  3.    2 V to 3.5 V per cm length of the arc
  4.    none of the above
 Discuss Question
Answer: Option D. -> none of the above
Question 43. In selenium rectifiers efficiencies ranging from ______ to ______ percent are attainable
  1.    25, 35
  2.    40, 50
  3.    60, 70
  4.    75, 85
 Discuss Question
Answer: Option D. -> 75, 85
Question 44. In a mercury arc rectifier positive ions are attracted towards
  1.    anode
  2.    cathode
  3.    shell bottom
  4.    mercury pool
 Discuss Question
Answer: Option B. -> cathode
Question 45. The metal rectifiers, as compared to mercury arc rectifiers
  1.    operate on low temperatures
  2.    can operate on high voltages
  3.    can operate on heavy loads
  4.    give poor regulation
  5.    none of the above
 Discuss Question
Answer: Option A. -> operate on low temperatures
Question 46. The internal efficiency of a mercury arc rectifier depends on
  1.    voltage only
  2.    current only
  3.    voltage and current
  4.    r.m.s. value of current
  5.    none of the above
 Discuss Question
Answer: Option A. -> voltage only
Question 47. The ignited or auxiliary anode in mercury arc rectifier is made of
  1.    Graphite
  2.    Boron carbide
  3.    Aluminium
  4.    Copper
 Discuss Question
Answer: Option B. -> Boron carbide
Question 48. The cathdde voltage drop, in a mercury arc rectifier, is due to
  1.    expenditure of energy in ionization
  2.    surface resistance
  3.    expenditure of energy in overcoming the electrostatic field
  4.    expenditure of energy in liberating electrons from the mercury
 Discuss Question
Answer: Option D. -> expenditure of energy in liberating electrons from the mercury
Question 49. In a rotary converter armature currents are
  1.    d.c. only
  2.    a.c. only
  3.    partly a.c. and partly d.c.
  4.    none of the above
 Discuss Question
Answer: Option C. -> partly a.c. and partly d.c.
Question 50. In a mercury arc rectifier______ flow from anode to cathode
  1.    ions
  2.    electrons
  3.    ions and electrons
  4.    any of the above
 Discuss Question
Answer: Option A. -> ions

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