EC T32 - ELECTRICAL ENGINEERING UNIT-I - TRANSFORMER 1. What is a transformer? 2. Briefly explain the principle of operation of transformers. 3. What are the parts of a transformer? 4. What are the types of core in transformer?(or) Classify the transformer according to the construction. 5. Name the windings of three phase transformer. 6. What is step up transformer? 7. Give the emf equation of the transformer. 8. What are the losses occurring in a transformer. 9. What are the components of primary no-load current? 10. What are the conditions for parallel operation of transformer? 11. What are the no load losses in a two winding transformer? And state the reasons for such losses (or) What are core losses in transformer? 12. Why is transformer rated in kva? 13. What is voltage transformation ratio? 14. Define voltage regulation of transformer. 15.Mention the applications of auto-transformer. 16. What are the various types of three phase transformer connections? 17. What is an ideal transformer?(or) What are the properties of an ideal transformer? 18. What is All day efficiency? 19. What is its significance of core losses in electric machines? 20. How are hysteresis and eddy current losses minimized? UNIT-I TRANSFORMER 1. Explain the construction and working principle of transformer. And derive its emf equation. 2. Describe the tests to determine core loss and full load copper loss of a transformer. 3. Derive the equivalent circuit of a single phase transformer. 4. Explain the principle of operation of an auto transformer. Deduce the expression for volume of copper saved in an auto transformer when compared with a two winding transformer. 5. Draw and explain the different types of connections in three phase transformer.
UNIT II D.C.MACHINES 1. What are the essential parts of a d.c generator? 2. Mention the types of DC generators. 3. What is coil span? 4. Define pitch. 5. How hysteresis and eddy current losses are minimized? 6. State Lenze s law. 7. Write down the emf equation for d.c.generator? 8. Define armature reaction? 9. Why commutator is employed in d.c.machines? 10. Distinguish between shunt and series field coil construction? 11. Define the term commutation in dc machines? 12. What is the function of carbon brush used in dc generators? 13. How will you change the direction of rotation of d.c.motor? 14. What is back emf in d.c. motor? 15. Enumerate the factors on which speed of a d.c.motor depends? 16. What is the principle of motor? 17. What are different methods of speed control in D.C shunt motor? 18. How does a series motor develop high starting torque? 19. What is the necessity of starter in dc motors? 20. Mention the application of DC motors? 21. What are the losses in dc motor? UNIT II D.C.MACHINES 1. Describe with neat diagram of the construction details of DC machines. 2. Explain the principle of operation of a DC generator with neat diagram and derive its Emf equation. 3. Draw and explain the no load and load characteristics of DC shunt and series generator. 4. What is meant by speed control of DC motor? Explain the various methods in brief. (or) Explain the various methods employed for speed control of DC motors and discuss their relative merits. 5. Derive the torque equation of DC motor and draw the torque characteristics of the motors.
UNIT III A.C. MACHINES 1. Differentiate between capacitor start & Capacitor start capacitor run single phase induction motor? 2. Why single phase induction motor have low PF? 3. What is slip? 4. Draw the speed torque characteristics of three phase induction motor. 5. Write the different types of single phase induction motors. 6. Explain why single phase induction motor is not a self starting one? 7. State any 4 use of single phase induction motor? 8. What is the function of capacitor in single phase induction motor? 9. Name the two winding of single phase induction motor? 10. List out the method for speed control of 3phase cage type induction motor? 11. Give the condition for maximum torque for 3phase induction motor, when it is running? 12. What is the advantage of cage motor? 13. What are slip rings? 14. Why an induction motor never runs at its synchronous speed? 15. Why an induction motor is called as rotating transformer? 16. Write two extra features of slip ring induction motor? 17. What are the 2 types of 3phase induction motor? (Or)What are the rotor types of 3 phase induction motor? UNIT III A.C. MACHINES 1. Explain the working principle of single phase induction motor. 2. Explain the types of single phase induction motor. (or) Explain detail about the starting of 1 phase induction motor. 3. Explain the principle of working of 3 phase induction motor. State how the direction of rotation of the motor can be reversed. 4. Explain the torque slip characteristics of three phase induction motor. 5. Explain the different types of speed control methods of three phase induction motor. 6. Explain the principle of working of an alternator. 7. Explain the production of rotating magnetic field in three phase induction motor.
UNIT-IV SPECIAL MACHINES 1. What is Servo motor? 2. Give the applications of servo motor. 3. What is stepper motor? 4. What is Step Angle? 5. What is resolution? 6. Give the Advantages of stepper motor 7. Give the Applications of stepper motor 8. What are the Types of Stepper Motors? 9. What are the features of Single-phase Synchronous Motors 10. What are the types of single phase synchronous motors? 11. What is Reluctance Motor? 12. Give the principle of reluctance motor. 13. What are the types of reluctance motors? 14. What are the Applications of reluctance motor? 15. What is Hysteresis Motor? 16. What are the Applications of hysteresis motor? 17. Write the applications of repulsion motor. 18. What is Universal Motor? 19. What are the Advantages of universal motor? 20. What are the Disadvantages of universal motors? 21. What are the Applications of universal motor? 22. What is Synchronous Motor? 23. What are the Applications of synchronous motor? UNIT-IV SPECIAL MACHINES 1. Explain the operation, characteristics and application of DC and AC servo motor. 2. What are stepper motors? Explain about the working of different types of stepper motor. 3. Describe the constructional features and principle of operation Reluctance Motor. 4. Describe the constructional features and principle of operation Hysteresis Motor. 5. Describe the constructional features and principle of operation Repulsion Motor. 6. Describe the constructional features and principle of operation Universal Motor. 7. Explain about Synchronous motor and its V- Curves.
UNIT V UTILISATION 1. Explain the principle of electrical heating. 2. Define electroplating and list its applications. 3. List the different types of domestic wiring. 4. State the laws of illumination. 5. What is meant by illumination? 6. What is meant by earthing? 7. What is the need of earthing? 8. What is electric traction? 9. What is the use of photo meter? 10. What are the modes of heat transfer? 11. Define Luminous flux. 12. Define Lumen. 13. Define solid angle. 14. Define candle power. 15. What are the advantages of electric heating over other methods of heating? 16. What are the types of electric heating? 17. What are the applications of electric heating? 18. What are the types of electric lamps? UNIT V UTILISATION 1. Explain the principle of electrical heating. State the advantages of electrically produced heat. 2. Discuss briefly about electrical heating with necessary diagram. 3. With the help of circuit diagram, explain the working of sodium vapor lamp. 4. What is the importance of earthing? Give their types. Discuss the types in detail. 5. Explain in detail about air conditioning and earthing. 6. Discuss about the laws of illumination. 7. Explain the process of electroplating. 8. Explain the electric traction with neat diagram. 9. Explain in detail about photometer. 10. Explain the various types of Electric lamps.