Class 4 (4th Engineer) MET 📅 Aug 2023

Exam Question

(a) Sketch a schematic arrangement of a three phase alternator with star connection. (6)

(b) A 500V, 3-phase, star-connected alternator supplies a star-connected induction motor which develops 45kW. The efficiency of the motor is 88 percent and the

power factor is 0.9 (lagging). The efficiency of the alternator at this load is 80 percent. Determine (10)

(i) The line current

(ii) The power output of the alternator

(iii) The output power of the prime-mover

Reference Answer

**(a) Sketch a schematic arrangement of a three-phase alternator with star connection.**
A three-phase alternator (synchronous generator) is an electrical machine that converts mechanical energy into three-phase electrical energy. Its operation is based on Faraday's law of electromagnetic induction.
**Key Components and Principles:**
* **Stator**: This is the stationary part of the alternator, typically housing the armature winding where the three-phase voltage is induced. The stator core is made of laminated steel to reduce eddy current losses.

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