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For a 3 phase 400V alternator supplying a load of 0.8 pf lagging at an armature current of 1.1pu. The power delivered to load is?

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For a 3 phase 400V alternator supplying a load of 0.8 pf lagging at an armature current of 1.1pu. The power delivered to load is?

(a) 0.88pu

(b) 0.8pu

(c) 0.66pu

(d) 1.375pu

The question was posed to me in a national level competition.

My doubt is from Power Angle Characteristics of Synchronous Machines in portion Synchronous Machines of Electrical Machines

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The correct choice is (c) 0.66pu

The explanation: P = EVsinδ/X = 1.1*1*sin36.67 = 6.6 pu.

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