5. a) A 900V DC series motor is rated at 388 HP, 3000 RPM. It has an armature resistance of 0.5 2 and a field resistance

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5. a) A 900V DC series motor is rated at 388 HP, 3000 RPM. It has an armature resistance of 0.5 2 and a field resistance

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5 A A 900v Dc Series Motor Is Rated At 388 Hp 3000 Rpm It Has An Armature Resistance Of 0 5 2 And A Field Resistance 1
5 A A 900v Dc Series Motor Is Rated At 388 Hp 3000 Rpm It Has An Armature Resistance Of 0 5 2 And A Field Resistance 1 (30.42 KiB) Viewed 14 times
5. a) A 900V DC series motor is rated at 388 HP, 3000 RPM. It has an armature resistance of 0.5 2 and a field resistance of 0.02 2. The machine draws 450 A from the supply when delivering the rated load. The magnetic saturation is to be ignored. Determine:- (1) The rated developed torque [4 marks] [3 marks] (ii) The rated efficiency (iii) The rotational losses at rated speed [2 marks] (iii) The speed when the load is changed, causing the line current to drop to 100A. [5 marks]
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