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Q6. A. Describe the normal criteria used for setting thermal protection relays and its advantage compared to magnetic types.

B.  An 18.65 kW,4-pole,50HZ, 3 phase induction motor has friction and windage losses of 2.5 percent of the output. The full load slip is 4% compute for full load (a) the rotor Cu loss (b) the rotor input (c) the shaft torque (d) the gross electromagnetic torque.