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Electrical Machines

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

 positive.
 low.
 negative.
  zero.

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Electrical Machines
A smaller air gap in a induction motor helps to

 increase the starting torque.
 reduce the magnetizing current.
 reduce the chance of crawling.
 reduce the chance of cogging.

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Electrical Machines
The speed of a motor falls from 1100 r.p.m at no-load to 1050 r.p.m at rated load. The speed regulation of motor is

 2.56 %.
 3.76%.
 2.57 %.
 4.76%.

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Electrical Machines
A DC series motor must started on no load because it would

 Not develop starting torque.
  Run at dangerously high speed.
 Fail to start without load.
 Draw more current without producing sufficient torque.

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Electrical Machines
The armature shaft must be able to withstand

 bending moment due to weight of the armature.
All of these
 any unbalanced magnetic pull on the armature core.
 twisting strains due to transmission of torque.

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Electrical Machines
A shaded pole single phase induction motor can be used for

 tape recorders
 food mixers
 personal computers as cooling fan
 wet grinders

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