Electrical Machines Questions and Answers DC Machines
DC Machine Applications
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A d.c. generator has been provided tappings on the armature winding at intervals of 120 degrees from the side of commutator. The connection will be
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Hoists, cranes and battery powered vehicles use _________ motors in the locomotive.
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Which of the following are applied with differential compound motor?
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Interpoles are used to start the dc motor above the base speed.
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Most commercial compound dc generator are normally supplied by manufacturers as ______ compounded machines.
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Maximum torque in dc series motor is limited by
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Long back ago, magnetic casette were in use, having permanent magnet dc motors which had
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If a dc shunt motor is stopped by forcing starter handle back to OFF position, then
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A 200 V dc motor has external resistances of Ra and Rf in armature and field circuits respectively. The starting current is reduced when
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There is an application which required pulsating loads, punch presses. The most preferred machines would be
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Most commercial compound dc generator are normally supplied by manufacturers as over compound machines because
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Inspite of heavy initial investments, dc motors are used due to
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The manufacturer has mentioned a medium starting torque and 15% speed regulation. The most appropriate motor for his requirement is
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Separately excited dc generators are used in
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Centrifugal pumps, fans-blowers use
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DC Machine Applications
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