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Rectifiers and Converters - section-1
Rectifiers and Converters - Section-2
  1. The average life of the glass bulb rectifier is
    2. A.
    100 to 150 hours
    B.
    1000 to 1500 hours
    C.
    10,000 to 15,000 hours
    D.
    100,000 to 150,000 hours

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  2. In mercury arc rectifier, voltage drop at anode is due to
    3. A.
    energy spent in overcoming the electrostatic field
    B.
    high temperature inside the rectifier
    C.
    self-restoring property of mercury
    D.
    high ionization potential

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  3. In a mercury arc rectifier the cathode voltage drop is due to
    4. A.
    surface resistance
    B.
    expenditure of energy in liberating electrons from the mercury
    C.
    expenditure of energy in ionization
    D.
    expenditure of energy in overcoming the electrostatic field

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  4. Least undulating current will be delivered by which mercury arc rectifier
    5. A.
    1-phase
    B.
    2 phase
    C.
    3 phase
    D.
    6 phase

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  5. Ionization potential of mercury is approximately
    6. A.
    1 V
    B.
    2 V
    C.
    10.4 V
    D.
    104 V

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  6. In arc rectifiers mercury is chosen as the liquid for rectifier because
    7. A.
    it has low specific heat
    B.
    it has low ionization potential
    C.
    it has high atomic weight
    D.
    all of the above

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  7. In an arc rectifier the drop in voltage at the cathode is approximately
    8. A.
    1 volt
    B.
    6 to 7 volts
    C.
    60 to 70 volts
    D.
    1.2 V7 volts

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  8. Which of the following rectifiers can withstand maximum voltage on dc side
    9. A.
    Mercury arc rectifier
    B.
    Glass bulb rectifier
    C.
    Steel tank rectifier
    D.
    None of the above

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  9. Maximum current rating of a glass bulb mercury arc rectifier is usually restricted to
    10. A.
    50 A
    B.
    100 A
    C.
    500 A
    D.
    1000 A

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  10. In a mercury arc rectifier positive ions are attracted towards
    11. A.
    mercury pool
    B.
    shell bottom
    C.
    cathode
    D.
    anode

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