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Electrical Machines

Electrical Machines
In DC machine torque is proportional to which of the following?

 armature current(Ia)
None of these
 both A and B
 flux(φ)

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 20, s = 3.33 %.
  P = 50, s = 4.43 %.
  P = 40, s = 5.79 %.
  P = 60, s = 0.96 %.

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Electrical Machines
The type of DC generator used for arc welding purpose is a

 series generator
 cumulatively compounded generator
 differentially compounded generator
 shunt generator

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Electrical Machines
Slot wedges in a dc machine is made up of

 mild steel.
 fibre.
 silicon steel.
 cast iron.

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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 all of these.
 high filed circuit resistance.
 over load.
 zero or very low voltage supply.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is

  600 rpm.
 3600 rpm.
 3000 rpm.
 500 rpm.

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