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Electrical Machines

Electrical Machines
Which of the following will vary the maximum torque?

None of these
 both 1 and 2
 rotor resistance R
 rotor reactance X

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

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

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss?

 60W
 40W
 100W
 80W

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Electrical Machines
which of the following losses are negligible in blocked rotor test?

 iron loss
 mechanical loss
 copper loss
 both A and B

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Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  Same as full load.
  High.
  Equal to 1.
  Low.

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 20 volts.
 40 volts.
 10 volts.
 30 volts.

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