engineering recuitment RVUNL JEn (RSEB) Mock Tests 2025 Electrical Machines DC Motor DC Motor Speed Control
A 220 V DC Machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 ohm. If the machine is now operated as a motor at the same terminal voltage and current but with the flux increased by 10 percent, the ratio of motor speed to generator speed will be
1
0.90
2
0.98
3
0.87
4
0.82
5
0.96