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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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Network Analysis 260 0 0
Signals and Systems 165 0 0
Control Systems 258 0 0
Analog Electronics 184 0 0
Digital Electronics 148 0 0
Electrical Machines 392 0 0
Power Electronics 237 0 0
Power Systems 344 0 0
EMFT EE 107 0 0
Measurement 158 0 0
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