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Review 3

Answer the following questions without referring to the material just presented.

  1. Calculate the rating of a single-phase transformer’s primary. The primary has a voltage of 1200 volts and a current of 10 amps.
    ________ kVA

  2. A transformer cannot change the frequency of the power supply. If the supply is 60 Hz, the output will also be 60 Hz.
    TRUE FALSE

  3. In your own words, define the term “basic impulse level.”
    ____________________________________________________________
    ____________________________________________________________
    ____________________________________________________________

  4. Calculate the efficiency of a transformer which takes in 20 kVA at the primary and puts out 19 kVA at the secondary.
    _________%

  5. In your own words, explain why sealing the tank of an oil-filled transformer is important.
    ____________________________________________________________
    ____________________________________________________________
    ____________________________________________________________

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Wheeling, WV

304-233-0960

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