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Electrical Machines

Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 1
 0
 3 or 4
 2

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Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

  less heating of the rotor.
  less heating of the rotor.
  all of these.
  negative sequence current.

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Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

 synchronous reactance
 excitation
 load angle
 both 1and 2

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 Ia
 Ia2
 1/Ia
 I/Ia2

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Electrical Machines
φA DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the speed when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 970 RPM
 920 RPM
 940 RPM
 960 RPM

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Electrical Machines
Voltage regulation can be determined by which of the following?

 MMf method.
All of these
 Synchronous impedance method.
 ZPF method.

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