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Electrical Machines

Electrical Machines
In DC machine torque depends on which of the following?

 armature current (I)
 speed
 both A and B
 flux (φ)

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Electrical Machines
A 4 pole 50 Hz 1-phase induction motor is running at 1470 rpm. Find the forward and backward slips?

 0.02, 1.98
 0.04, 0.96
 0.02, 0.98
 0.04, 1.96

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Electrical Machines
Winding conductors of an electrical power transformer are mainly insulated by

  paper insulation.
 rubber insulation.
 cotton insulation.
 wooden insulation.

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Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  Shunt.
  Series.
  Compound.
  None of them.

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Electrical Machines
Copper brushes in DC machine are used

None of these
 in both of above cases.
 where low voltage and high currents are involved.
 where high voltage and low current.

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Electrical Machines
The back emf produced in a dc motor depends on

  Z.
  P.
  none of these.
  P and Z.

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