Rectifiers

51. Which of the following is reversible in action?

1. Motor generator set
2. Motor converter
3. Rotary converter
4. Any of the above

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52. Which of the following is the loss within the mercury arc rectifier chamber?

1. Voltage drop in arc
2. Voltage drop at the anode
3. Voltage drop at the cathode
4. All of the above

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53. Which of the following mercury arc rectifier will deliver least undulating current?

1. Six-phase
2. Three-phase
3. Two-phase
4. Single-phase

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54. Which of the following metals is generally manufactured by electrolysis process?

1. Load
2. Aluminium
3. Copper
4. Zinc

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55. 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

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56. Which of the following rectifiers are primarily used for charging of low voltage batteries from AC. supply?

1. Mechanical rectifiers
2. Copper oxide rectifiers
3. Selenium rectifiers
4. Electrolytic rectifiers
5. Mercury arc rectifiers

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57. Which of the following rectifiers have been used extensively in supplying direct current for electroplating?

1. Copper oxide rectifiers
2. Selenium rectifiers
3. Mercury arc rectifiers
4. Mechanical rectifiers

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58. Which of the following statement is incorrect?

1. Copper oxide rectifier is a linear device
2. Copper oxide rectifier is not a perfect rectifier
3. Copper oxide rectifier has a low efficiency
4. Copper oxide rectifier finds use in control circuits
5. Copper oxide rectifier is not stable during early life

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59. 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

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