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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 44 A.
 40 A.
 440 A.
 400 A.

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Electrical Machines
In electric locomotives which of the following motor are used ?

 Synchronous motor.
 DC series motor.
 DC Shunt motor.
 DC compound motor.

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in series with the series field
 in parallel with the shunt field
 in parallel with the series field
 in series with the shunt field

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Electrical Machines
Semi closed slots or totally closed slots are used in induction motors, essentially to

 increase pull out torque
 decrease starting torque
 reduce magnetising current and improve power factor
 improve starting torque

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Electrical Machines
A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be

 zero.
  more than core loss.
 equal to core loss.
 less than core loss.

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T is independent of P.
 T ∝ P.
 T ∝ √P.
 T2 ∝ P3.

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