Electrical Machines Questions and Answers : Torque in DC Machines
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Choose the correct representation, which depict a nonzero torque in the armature.
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Wrong!

The simple rotating loop between pole faces connected to a battery and resistor through a switch, the specifications of this machine are radius = 0.5m, length 1m, resistance = 0.3 ohms and magnitude strength = 0.25T is supplied with 120V. Suddenly the switch is closed at t=0, what is observed in the circuit?
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Wrong!

The velocity of the dc machine at the final state is
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What is the principle of torque production in a dc machine?
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12. Pulsating torque frequency in universal motor
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DC Motor torque depends on
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For a universal motor, the rated supply current is 10A giving a rated torque of 100 Nm. If a current of 5A is applied, what will be generated torque vary to?
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The cogging torque is absent in the permanent magnet dc machine is due to
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If the torque is in the direction of rotation, the DC machine acts as
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The simple rotating loop between pole faces connected to a battery and resistor through a switch, the specifications of this machine are radius = 0.5m, length 1m, resistance = 0.3 ohms and magnitude strength = 0.25T is supplied with 120V. What is the steady state angular velocity at noload?
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The torque induced beyond the pole shoes in the DC machine is
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The variation of current in the armature can be best expressed by which of the below curves?
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The simple rotating loop between pole faces connected to a battery and resistor through a switch, the specifications of this machine are radius = 0.5m, length 1m, resistance = 0.3 ohms and magnitude strength = 0.25T is supplied with 120V. What will be the magnitude of the following current at t=0+?
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If the torque induced is zero in the dc machine, it can be said that
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