1.What are the requirements of Alternator? 2.What are the two types of alternators? 3. Write the formula to calculate the synchronous speed of the alternator. 4.Define ‘Synchronous Impedance. 5.What is a Synchronous Condenser? 6. Calculate the step angle of 200 steps per revolution stepper motor. 7. Write the two types of 3 phase induction motor. 8.Define Slip. 9. Mention the code of practice for the selection of starters for induction motor and installation and maintenance of Induction motors. 10. What is single phasing? 11. Calculate the distribution factor for 48 slots, 4 pole single layer 3 phase winding. 12. What are the effects of armature reaction in alternators? 13. Name the four methods of starting a synchronous motor. 14. In the Cage rotor the slots are made with a slight skew. Why? 15. What is “continuous rating” and “intermittent rating” of motor? 16.a) Explain with a neat sketch the constructional details of a salient pole alternator. (or) b) Explain the methods of obtaining sine wave in salient pole alternators with neat sketches. 17.a) Explain armature reaction of alternators on load at various power factors. 18.a) Why is a synchronous motor not self starting? Explain any one method of
starting of synchronous motor. (or) b) Explain the constructional details and working principle of a shaded pole single phase induction motor. 19.a) Explain the slip-torque characteristic of induction motor and identify thestableand unstable regions.(or) b) The supply is taken from a 8 pole, 3 phase 750 rpm alternator to a 6 pole 3 phase induction motor. If the slip of the induction motor is 4% calculate the full load speed of the induction motor. 20.a) What do you mean by single phasing?Explain how single phasing isprevented using current operated relays.(or) b) Explain degreasing, varnishing and vacuum impregnation for improving the insulationresistance value of Induction motor.
1. Mention the advantages of short pitch winding. 2. Mention the types of alternator rotor.