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Electrical Machines

Electrical Machines
Stepper motor is used in

All of these
 computer printers
 food processing
 traction

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Electrical Machines
An ideal DC generated is one that has _____________ voltage regulation.

 negative.
 low.
  zero.
 positive.

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Electrical Machines
In DC machine shape of armature MMF wave is?

 Saddle shape.
 Triangular and directed towards main pole.
 Triangular and directed towards brush axis.
 Peaky in nature.

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Electrical Machines
The speed regulation of a DC motor is given as

 (NfL − NnL)/NnL.
 (NnL − NfL)/NfL.
 NnL/NfL.
 NnL − NfL.

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Electrical Machines
Total core loss is also called as -------------?

 Eddy current loss
 Copper loss
 Hysteresis loss
 Magnetic loss

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Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then

 both armature current Ia and speed ωm increase
 Ia increases and ωm decreses
 both decrese
 Ia remains constant but ωm increase

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