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Electrical Machines

Electrical Machines
The field divertor resistance for a DC series motor is of order of

 0.1 Ω
 10 Ω
 100 Ω
 50 Ω

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Electrical Machines
What is the mechanical power developed by a DC series motor is maximum?

 Back emf is equal to applied voltage.
 Back emf is equal to half the applied voltage.
 Back emf is equal to zero.
 None of above.

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Electrical Machines
For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

 differentially compounded.
  separately excited.
  shunt connected.
  cumulatively compounded.

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Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

 5
 12
 10
 24

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Electrical Machines
The armature shaft must be able to withstand

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

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Electrical Machines
Alternator operates on the principle of

  mutual induction.
  self induction.
  electromagnetic induction.
  self or mutual induction.

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MORE MCQ ON Electrical Machines

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