EXAMIANS
Ward Leonard control provides speed control
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Consider the following statements regarding the speed control of dc motors : 1. ward-leonard method is suitable forconstant-torque drives 2. Ward-leonard method is suitable for constant-power drives 3. field-control method facilitates speed control below base speed 4. Armature-resistance control method is more efficient than ward-leanard method 5. Field-control method is suitable for constant-torque drives 6. Armature-resistance control method is suitable for constant-torque drives From these, the correct answer is
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Armature resistance control method is also called as-----------?
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To eliminate 5th harmonic in the induced voltage phase breadth should be
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In a DC generator the emf generated by the armature is maximum when
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Which of the following machine is invariably provided with forced ventilation?
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If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field
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A single phase, 2 KV alternator has an armature resistance of 0.8 ohms and 4.94 ohms respectively. The voltage regulation of the alternator at 100 a load 0.8 loading power factor is
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A compound motor has
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For the speed control of polyphase squirrel cage induction motor, if frequency of operation is decreased with
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