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Rectifiers and Converters - section-1
Rectifiers and Converters - Section-2
  1. To produce cathode spot in a mercury arc rectifier

    2. A.

     anode is heated
    B.

     tube is evacuated
    C.

     an auxiliary electrode is used
    D.

     low mercury vapour pressures are used

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  2. A synchronous converter can be started

    3. A.

     by means of a small auxiliary motor
    B.

     from A.C. side as induction motor
    C.

     from D.C. side as D.C. motor
    D.

     any of the above methods

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  3. In a single phase rotary converter the number of slip rings will be

    4. A.

     two
    B.

     three
    C.

     four
    D.

     six

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

    5. A.

     Copper oxide rectifiers
    B.

     Selenium rectifiers
    C.

     Mercury arc rectifiers
    D.

     Mechanical rectifiers
    E.

     None of the above

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  5. In a three-phase mercury arc rectifiers each anode conducts for

    6. A.

     One-third of a cycle
    B.

     One-fourth of a cycle
    C.

     One-half a cycle
    D.

     Two-third of a cycle

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  6. Ageing of a selenium rectifier may change the output voltage by

    7. A.

     5 to 10 per cent
    B.

     15 to 20 per cent
    C.

     25 to 30 per cent
    D.

     none of the above

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  7. In a rotary converter I2R losses as compared to a D.C. generator of the same size will be

    8. A.

     same
    B.

     less
    C.

     double
    D.

     three times

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

    9. A.

     Mechanical rectifiers
    B.

     Copper oxide rectifiers
    C.

     Selenium rectifiers
    D.

     Electrolytic rectifiers

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  9. The efficiency of the copper oxide rectifier seldom exceeds

    10. A.

     90 to 95%
    B.

     85 to 90%
    C.

     80 to 85%
    D.

     65 to 75%

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  10. A rotary converter combines the function of

    11. A.

     an induction motor and a D.C. generator
    B.

     a synchronous motor and a D.C. generator
    C.

     a D.
    D.

     none of the above

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