EXAMIANS
What is the highest possible speed of turbo alternators?
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If the field winding connection of DC shunt motor is changed
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A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is
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If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is
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Which of the following DC Motor requires 3 point starter?
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Ward-Leonard system for controlling the speed of a DC motor is used where
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A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be
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If the temperature of armature resistance is increased, the speed of a series motor would
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For a DC machine having P no of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for simple wave-winding ?
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A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be
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