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Electrical Machines

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

 30°
 20°
 60°
 18°

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 none of above
 shunt field
 armature circuit
 both A and B

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Electrical Machines
Which of the following represents the rotating losses of machine?

 Friction and windage losses
 Eddy current losses
 All of the them
 Hysteresis losses

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Electrical Machines
Which one of the following statement is correct ? In an induction motor if the air gap is increased then

 its speed will increase
 its power factor will reduce
 its efficiency will improve
 its speed will reduce

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Electrical Machines
The direction of rotation of a DC motor can be determent by

 Amperes law.
  Flemings left hand rule.
 Flemings right hand rule.
 Lenzs law.

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Electrical Machines
In a DC Motor 3 point starter is used to

 provide overload protection.
 all of above.
 provide protection against Low-Voltage.
 limit the starting current to a safer value.

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