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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

  star delta.
  both A and B.
None of these
  DOL.

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Electrical Machines
The field system of an alternator is usually excited

  250 / 250 V DC.
  110 / 220 V AC.
  3 - Φ, 50 Hz and 400 V.
  230 V AC.

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Electrical Machines
On what factors the speed of dc motor depends?

 All of these.
 Armature current Ia.
 Applied voltage.
 Field flux.

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Electrical Machines
Tertiary winding in a transformer is mostly

 star connected.
 zig - zag delta connected.
 zig - zag star connected.
  delta connected.

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = ωm
 ωe = 4*ωm
 ωe = 1/2*ωm
 ωe = 2*ωm

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Electrical Machines
If the load current and the flux of a DC motor are held constant and voltage applied across its armature is increased by 5%, the speed of the motor will

 increase by 5 %.
 depend on other factors.
 reduce by 5 %.
 remain unchanged.

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MORE MCQ ON Electrical Machines

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