SSE JE Electrical Engineering 10 Dec 2020 Papers

Question : 197 of 200

Marks: +1, -0

A 8-kW, 4-pole, 220-V, 50-Hz reluctance motor has a torque angle of 30° when operating under rated load conditions. Calculate the load torque.

Solution:

P = 4, f = 50 Hz, power = 8000 W

\N_\s = 120 × 50 / 4

= 1500 \RPM

\ω = (2 × \π × 1500) / 60

\ω = 157 \rad\/\s

\Torque = \Power / \ω

\Torque = 8000 / 157

\Torque = 51 \N-\m

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