EE Unit 4 Notes AKTU (BEE101)

AKTU · BTECH · Semester 1, 2 · Fundamentals of Electrical Engineering · Unit 4 · Notes

AKTU Fundamentals of Electrical Engineering (BEE101) Unit 4 notes for B.Tech Semester 1/2 – Electrical Machines. Topics: DC Machines, Three Phase Induction…

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Unit 4: Electrical Machines – AKTU syllabus topics

  • DC Machines: DC Machine Construction and Types, EMF Equation of DC Generator, Torque Equation of DC Motor, DC Motor Applications
  • Three Phase Induction Motor: Induction Motor Construction Types, Slip Torque Characteristics, Slip Numerical Problems
  • Single Phase Induction Motor: Principle and Starting Methods
  • Three Phase Synchronous Machines: Alternator Principle and Operation, Synchronous Motor Operation

Most asked AKTU PYQ questions from Unit 4

  1. Q2d. What are the factors affecting speed of a DC motor? Compare lap and wave type armature winding. (10 marks, 2021-22)
  2. Q6a. Derive an expression for torque in DC motor. A 230V DC series motor draws 50A current. Armature resistance 0.2Ω and series field winding resistance 0.1Ω. Calculate (i) brush voltage and (ii) back EMF. (10 marks, 2021-22)
  3. Q6b. Why is an induction motor called a generalized transformer? Compare the induction motor with the transformer. (10 marks, 2021-22)
  4. Q1g. What is the generated EMF in DC generator? (2 marks, 2021-22)
  5. Q2b. (i) List all the important parts of a DC Motor and explain the importance of each. (ii) Calculate the emf generated by 4 pole wave wound generator having 65 slots with 12 conductors per slot when driven at 1200 rpm. The flux per pole is 0.02 Wb. (10 marks, 2021-22)
  6. Q6a. A 4-pole generator with 400 armature conductors has a useful flux of 0.04Wb per pole. What is the emf produced if the machine is wave wound and runs at 1200rpm? What must be the speed to generate the same emf if machine is lap wound? (10 marks, 2021-22)
  7. Q6b. An 8-pole, 400V shunt motor has 960 wave connected armature conductors. The full load armature current is 40A and flux per pole is 0.02Wb. The armature resistance is 0.1Ω and the contact drop is 1V per brush. Calculate the full load speed of the motor. (10 marks, 2021-22)
  8. Q7a. (i) Explain the slip torque characteristics of the three-phase induction motor. (ii) The voltage applied to the stator of a 3-phase, 4-pole induction motor has frequency of 50Hz. The frequency of the emf induced in the rotor is 15.5Hz. Determine the slip and speed at which motor is running. (10 marks, 2021-22)
  9. Q2d. How is a rotating magnetic field produced in a three phase induction motor? (7 marks, 2025-26)
  10. Q6a. What are the applications of a DC motor? Discuss the factors influencing the selection of a DC motor. A 8 pole lap-wound DC generator has useful flux per pole 0.05 Wb, if the no load voltage at 400 rpm is 300V. Find the number of conductors on the armature periphery. (7 marks, 2025-26)

AKTU paper codes: BEE101, BEE201, KEE101, KEE201

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