Problem $15\mathrm{.}046-$ A three$-$phase, Y$-$connected synchronous motor delivering full load $-$ DEPENDENT MULTI$-$PART PROBLEM $-$ ASSIGN ALL THE PARTS

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A $10-$hp$,230-$V$,60$ Hz$,$ three$-$phase, Y$-$connected synchronous motor delivers full load at a power factor of $0\mathrm{.}8$ leading. The synchronous reactance is $6,$ the rotational loss is $230$ W$,$ and the field loss is $50$ W$.$ Neglect the stator winding resistance.

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NOTE: This is a multi$-$part question. Once an answer is submitted, you will be unable to return to this part.

Problem $15\mathrm{.}046.$b $-$ The motor efficiency

Find the motor efficiency.

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The motor efficiency is $\%.$