Practical Transformer

When referring a primary impedance to the secondary side, it will be ...

• multiplied by the turns ratio

• multiplied by the turns ratio square

• divided by the turns ratio

• divided by the turns ratio square

How many passive parameters exist in any practical transformer's equivalent circuit?

• 4

• 5

• 6

Write the scientific expression for these passive parameters

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Answer explanation

Rc: core resistance...Xm: magnetizing reactance...Rp: primary resistance...Rs: secondary resistance...Xp: primary reactance...Xs: secondary reactance

How many currents exist in the practical transformer's equivalent circuit?

How many losses exist at any practical transformer?

• 2

• 3

• 4

Write the scientific expression for these losses

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Answer explanation

Pcor: core loss......Pcu: copper loss

What is the value of the load ratio to find the maximum efficiency?

• 0.5

• 1

• undefined

What is the value of the load ratio to find the full-load efficiency?

• 0.5

• 1

• undefined

What is the value of the load ratio to find the half-load efficiency?