Armature reaction in a DC motor is increased
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The shaft torque (Tsh) in a d.c motor is less than total armature torque (Ta) because of ……………. in the motor.
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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
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The speed of a d.c. motor is
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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
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The amount of back e.m.f. of a shunt motor will increase when
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When the speed of the DC motor is Increases its Armature current
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A 250 V, DC shunt motor takes a line current of 20 A. The resistance of shunt field winding is 200Ω and resistance of the armature is 0.3 Ω Find the armature current and the back e.m.f.
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In D.C motors Diverters are used in
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The flux density under trailing pole tip in DC motor tends to
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The function of the Dummy coil is to
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The function of yoke in a DC machine is
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