Electrical Machines
DC Machines
Equivalent Circuit - DC Machines
Questions mapped to Equivalent Circuit - DC Machines under DC Machines.
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IncorrectA permanent magnet dc commutator motor has a no load speed of 6000 rpm when connected to a 120V dc supply. The armature resistance is 2.5 ohms and other losses may be neglected. The speed of the motor with supply voltage of 60V developing a torque 0.5 Nm, is:
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Sign in to UnlockA belt driven dc shunt generator runs at 1500 rpm delivering 10kW, at 220V bus bars. The belt breaks, following which the machine operates as a motor drawing 2kW power. What will be its speed as a motor? The armature and field resistances are 0.25 ohms and 55 ohms respectively. Ignore armature reaction and assume the contact drop at each brush to be 1V.
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Sign in to UnlockA DC shunt motor is running at 1200 rpm, when excited with 220V DC. Neglecting the losses and saturation, the speed of the motor when connected to a 175V DC supply is:
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