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True or false: a transformer has no moving parts and therefore no losses.

  • A.False, since it has copper and iron losses
  • B.True, since losses arise only from friction and windage
  • C.True, provided its core is properly laminated
  • D.False, since it has friction losses at its terminals

Answer: A

Ohmic heating in the windings and hysteresis and eddy currents in the core both dissipate power, which is why a large transformer needs radiators and sometimes fans. The absence of moving parts is what makes its efficiency so high, not perfect.

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