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Electrical Machines

Electrical Machines
Total core loss is also called as -------------?

 Eddy current loss
 Copper loss
 Magnetic loss
 Hysteresis loss

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 AC single phase motor.
 Induction motor.
 Synchronous motor.
 DC Shunt Motor

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Electrical Machines
Cross magnetization effects which of the following?

 commutation
 reduces the terminal voltage
 reduction in main field flux
 both 2 and 3

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Electrical Machines
CRGO steel is used in the core of transformer to reduce

 ohmic loss.
 eddy current loss.
 both eddy current and hysteresis loss.
  hysteresis loss.

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Electrical Machines
When the mechanical power is developed by a DC motor maximum

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

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Electrical Machines
A shunt generator has a critical field resistance of 300 Ω at a speed of 800 rpm if the speed is raised to 1000 rpm the critical field resistance is

 225 Ω.
 150 Ω.
 145 Ω.
  375 Ω.

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