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Electrical Machines

Electrical Machines
In DC machine torque is proportional to which of the following?

None of these
 armature current(Ia)
 flux(φ)
 both A and B

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Electrical Machines
For a DC machine having P no of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance for simple wave-winding ?

 PZL/4Sp²
 PZL/ 4Sa
 PZL/4S
 PZL/4Sa²

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Electrical Machines
A crusher is equipped with

 Slip ring induction motor.
 Reluctance motor.
 DC shunt motor.
 Synchronous motor.

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Electrical Machines
In a transformer, hysteresis and eddy current losses depend upon

 both 2 and 3
 load current
 maximum flux density
 supply frequency

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Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  relative speed.
  air gap.
  cogging.
  crawling.

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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%.

 960 RPM
 970 RPM
 940 RPM
 920 RPM

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