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1) Explain the following concepts, use drawings and equations when adequate

Electrical Engineering

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1) Explain the following concepts, use drawings and equations when adequate. 21) b) C) 6') Describe the stator and rotor constructions and the principle of operation of a separately excited DC-machine. (Hint: ?eld and armature, forces on conductors and torque, induced voltage, commutator and brushes, etc...) (3p.) Explain the three running modes of operation of an induction machine by drawing the Torque- Speed (or Slip) curve and give the range of the slip for each mode of operation (3 p.) Draw the complete single-phase equivalent circuit ofa transformer and explain what each of its component represents (3 p.) Explain the static stability limits ofa synchronous machine. What are these limits? Why they are important? What happens if any of them exceeds? (hint: use drawing in the PQ plan) (3 p.)

You can use Principles of Electrical Machine and Power Electronics by P.C SEN to answer these questions