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Electrical Machines

Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 3/4.
 4/3.
 16/9.
 9/16.

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Electrical Machines
In the V curve shown in figure below for a synchronous motor, the parameter of Y and X coordinates are, respectively

 Armature current and torque.
 Torque and field current.
 Power factor and field current.
  Armature current and field current.

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Electrical Machines
Which of the following motor has more stability

 cylindrical motor
None of these
 both motors has same stability
 salient pole motor

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Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 1/3
 1/√3
 √3
 3

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Electrical Machines
A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 570 A.
 250 A.
  460 A.
  340 A.

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Electrical Machines
Ideal value of voltage regulation of a device is?

 a positive finite value
 0
 a finite negative value
 ∞

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