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Practice over 1000+ GATE-level questions from this topic!

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Q#1 DC Machines GATE EE 1991 MCQ +2 marks -0.66 marks

A 10 kW, 6 pole, D.C generator develops an EMF of 200V at 1500 rpm. The armature has a lap connected winding. The average flux density over a pole pitch is 0.9 Tesla. The length and diameter of the armature are 0.25m and 0.2m respectively. Calculate

(a) The flux per pole

(b) The total number of active conductors in the armature

(c) The torque developed by the machine when the armature supplies a current of 50A.

(a) Flux per pole = 0.02355 Wb
(b) Number of conductors = 540
(c) Torque developed = 43.69 N-m

(a) Flux per pole = 0.2355 Wb
(b) Number of conductors = 340
(c) Torque developed = 63.69 N-m

(a) Flux per pole = 0.02355 Wb
(b) Number of conductors = 340
(c) Torque developed = 63.69 N-m

(a) Flux per pole = 0.02355 Wb
(b) Number of conductors = 440
(c) Torque developed = 53.69 N-m

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