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Electrical Machines

Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 10°
 60°
 45°
 30°

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Electrical Machines
Which of the following pairs is/are correct?

All of these
 semi closed slot-----leakage flux is moderate
 open slot----- leakage flux is less
 closed slot----- leakage flux is high

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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 both the torque and voltage
 neither the voltage nor the torque
 torque but not the voltage
 voltage but not the torque

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

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

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 95%
 92%
 94%
 96%

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Electrical Machines
A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at

 750rpm
 1500 rpm
 1000 rpm
 zero speed

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