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Electrical Machines

Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 5%
 40%
 19%
 10%

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Electrical Machines
Induction motors provided with open slots have

  higher efficiency.
  less breakdown torque.
  leading power factor.
  more breakdown torque.

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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 lap-winding ?

 PZL/4Sa²
 PZL/4S
 PZL/ 4Sa
 PZL/4SP²

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Electrical Machines
The main purpose of providing tertiary winding in a three phase transformer is

  to suppress harmonic and unbalance in voltage.
None of these
 to carry extra load.
 to interconnect three voltage systems.

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Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 30°
 60°
 20°
 18°

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Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 0°
 90°
 25° to 30°
 70° to 85°

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