Asinglephase transformer has the following
nameplate data:
rating 150kva
primaryvoltage 7.2kv
secondaryvoltage 600v
frequency 60hz
whenoperating at rated load (full load) the
following lossesoccur:
hysterisisloss 550 w
eddy currentloss 400 w
total copperlosses 1800 w (primary + secondary)
thetransformer is to be used on a 50 hz system with
the restrictionthat it is to
maintain thesame maximum core flux density and the
same total losses. thiswill
result in thesame full load operating temperature.
determine:
(i) the newprimary and secondary voltage rating at
50 hz;
(ii) the newkva rating of the transformer of the 50
hz.

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explanation:

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explanation:

answer:

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the equation above shows how temperature f, measured in degrees fahrenheit, relates to a temperature c, measured in degrees celsius. based on the equation, which of the following must be true?

a temperature increase of 1 degree fahrenheit is equivalent to a temperature increase of

5

9

degree celsius.

a temperature increase of 1 degree celsius is equivalent to a temperature increase of 1.8 degrees fahrenheit.

a temperature increase of

5

9

degree fahrenheit is equivalent to a temperature increase of 1 degree celsius.

a) i only

b) ii only

c) iii only

d) i and ii only