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Electrical Machines

Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/120.
 PN/2.
 PN/60.
 PN/3000.

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Electrical Machines
Which of the following motor is more expensive for same KW output rating ?

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

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Electrical Machines
Which of the following generators are used in arc welding?

 cumulative compound generators
 shunt generators
 differential compound generators
 series generators

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Electrical Machines
In Ward-Leonard system, the lower limit of the speed imposed by

 Field resistance.
 Armature resistance.
 Residual magnetism of the generator.
 None of above.

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 decrease.
 increase.
 either of these.
None of these

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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.
  460 A.
  340 A.
 250 A.

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