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ELECTRICAL MACHINES QUIZ

In DC machines internal characteristics are plotted between

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If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will

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DC machine windings are

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An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

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To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

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The volt-ampere euation for a long-shunt compound motor is given by

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A dc shunt motor runs at a no-load speed of 1140 rpm. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full-load speed in rpm is

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A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

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In which of the following, voltage regulation may be zero or negative

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In circle diagram for induction motor, diameter of circle represents which of the following ?

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