Question

1. A six-pole, 30-slot dc commutator generator has a lap wound Armature winding. The armature

constant, Ka is 9.55.The generator is operated with a separately excited field such that the field

flux per pole is 0.04 weber/pole. The generator is driven at a speed of 3000 rpm. The no load

armature voltage is 418.9 V. The above generator is now operated as a motor. The flux is 0.04

weber/pole. It is desired to supply a load requiring a Torque of 50 n–m at 4000 rpm. Armature

circuit resistance is 0.075 ohm. Calculate (a) the back emf, (b) the required armature current and

voltage to supply this load.​

Answer 1

Answer:

It is given that two circle having radii 5.5 cm and 4.2 cm touch each other externally. We know, the distance between the centres of the circles touching externally is equal to the sum of their radii. Thus, the distance between their centres is 9.7 cm.