A 440-V shunt motor has armature resistance of 0.8 Ω and field resistant 200 Ω. What will be the back e.m.f when giving an output of 7.46 kW at 85 percent efficiency
In a d.c. motor, the brushes are shifted from the mechanical neutral plane in a direction opposite to the rotation to
A 4 pole d.c motor takes a 50 A armature current. The armature has lap connected 480 conductors. The flux per pole is 20 mWb. Calculate the gross torque developed by the armature of the motor.
The torque developed by a d.c motor is directly proportional to
The torque developed by a d.c motor is directly proportional to Read More »
The shaft torque (Tsh) in a d.c motor is less than total armature torque (Ta) because of ……………. in the motor.
A 500 V shunt motor runs at its normal speed of 250 RPM when the armature current is 200 A. The resistance of armature is 0.12 Ω
A 4 pole, 250 V, DC series motor has a wave-connected armature with 200 conductors. The flux per pole is 25 mWb when the motor is drawing 60 A from the supply. The armature resistance is 0.15 Ω while the series field winding resistance is 0.2 Ω. Calculate the speed under this condition
The amount of back e.m.f. of a shunt motor will increase when
The amount of back e.m.f. of a shunt motor will increase when Read More »
