A separately excited D.C. motor is driven from a 240 V, 50 Hz, 1-o supply using fully controlled thyristor bridge. The motor has an armature resistance of 1 2 and armature voltage constant 0.8 V-s/rad. Assume armature current is constant. The speed of the motor delivering 42.4 N-m load torque at 30° firing angle is approximately equal to (a) 1000 rpm (c) 1600 rpm (b) 1200 rpm (d) 2230 rpm

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A separately excited D.C. motor is driven from a 240 V, 50 Hz, 1-o supply using fully controlled
thyristor bridge. The motor has an armature resistance of 12 and armature voltage constant
0.8 V-s/rad. Assume armature current is constant. The speed of the motor delivering 42.4 N-m
load torque at 30° firing angle is approximately equal to
(a) 1000
(c) 1600 rpm
(b) 1200
rpm
(d) 2230 rpm
rpm
Transcribed Image Text:A separately excited D.C. motor is driven from a 240 V, 50 Hz, 1-o supply using fully controlled thyristor bridge. The motor has an armature resistance of 12 and armature voltage constant 0.8 V-s/rad. Assume armature current is constant. The speed of the motor delivering 42.4 N-m load torque at 30° firing angle is approximately equal to (a) 1000 (c) 1600 rpm (b) 1200 rpm (d) 2230 rpm rpm
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