Safety Class Chapter 12

1. 1
   Matched impedances provide:

   1. AMaximum voltage transfer
   2. BMaximum power transfer
   3. CMaximum current transfer
   4. DMaximum reactance
2. 2
   In addition to copper loss, a transformer will also have: (select all that apply)

   1. AHysteresis loss (iron loss)
   2. BInsulation loss
   3. CStray field/eddy current loss
   4. DRadioactive loss
3. 3
   The unit of mutual inductance is

   1. AHenry
   2. BFarad
   3. COhm
   4. DJoule
4. 4Connecting the transformer’s (matched) secondary windings in parallel ________ but ________.

   1. AAdds their voltage
   2. BAdds their turns ratio
   3. CAdds their resistance
   4. DAdds their current
   5. EKeeps the same voltage
   6. FKeeps the same resistance
   7. GKeeps the same current
5. 5
   In a transformer, when voltage is stepped down, current is stepped:

   1. Aup
   2. Bdown
   3. Cover
   4. Dto ground
6. 6A majority of power loss occurs in the ________ and the ________ of the transformer.

   1. ALeakage flux
   2. BTerminals
   3. CCore
   4. DWindings
7. 7Primary flux that does not couple to the secondary is known as: *

   1. ALeakage flux
   2. BResistance
   3. CReluctance
   4. DElectric field
8. 8The portion of the flux of one coil that couples to another coil is indicated by the:

   1. ACapacitance
   2. BResistance
   3. CAdmittance
   4. DCoefficient of coupling
9. 9________ transformers have the same primary and secondary voltages

   1. AStep up
   2. BStep down
   3. CCenter tapped
   4. DIsolation (1:1)
10. 10
    When the coupling between a transformer's windings is 100%, the turns ratio is numerically equal to the voltage ratio.

    1. ATrue
    2. BFalse

11. 11The _________ is a transformer that does not provide isolation.

    1. ASingle phase transformer
    2. BThree phase transformer
    3. CIsolation transformer
    4. DAutotransformer
12. 12I^2 x R loss is also called:

    1. AResonance
    2. BReactance
    3. CCopper Loss
    4. DStray field loss
13. 13
    The same symbol is used for the air core transformer and the iron core transforme

    1. ATrue
    2. BFalse
14. 14Matched impedances is desirable because of:

    1. AMaximum voltage transfer
    2. BMaximum power transfer
    3. CMaximum current transfer
    4. DMaximum reactance
15. 15Transformers operate on the principle of:

    1. Acapacitive coupling
    2. Bmutual inductance
    3. Cmutual resistance
    4. Delectric field coupling
16. 16When a transformer has no load connected to the secondary, the primary current is called the:

    1. AExcitation current
    2. BFull load current
    3. CRMS current
    4. DAverage current
17. 17
    In an autotransformer, part or all of a coil is used as both the ‘primary’ and ‘secondary’ winding. *
    

    1. ATrue
    2. BFalse
18. 18
    Power factor approaches 1 when the secondary is fully loaded with a resistive load.

    1. ATrue
    2. BFalse
19. 19Transformer wattage ratings are specified for purely ________ loads.

    1. AInductive
    2. BCapacitive
    3. CResistive
    4. DReactive
20. 20Connecting the transformer’s secondaries in series ________ but ________. (select two)

    1. AAdds their voltage
    2. BAdds their turns ratio
    3. CAdds their resistance
    4. DAdds their current
    5. EKeeps the same voltage
    6. FKeeps the same resistance
    7. GKeeps the same current

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Quiz on Safety Class Chapter 12 , created by Regino Callan on 15/12/2020.

Author

Regino Callan

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