Semester 3,Module 4-AC Single Phase Motor
Electrician and wireman
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NAME OF THE ITI *
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1 .What is the working principle of single phase induction motor? *
2 points
2 What is the name of single phase motor? *
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3 What is the working principle of split phase motor? *
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4 Faraday’s laws of electromagnetic induction *
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5 Which type of A.C single phase motor is classified under commutator motor type? *
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6 Which method is adopted to start the single phase induction motor? *
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7 What is the type of A.C single phase motor? *
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8 What is the purpose of the capacitor (C) in centrifugal switch speed control method of universal motor? *
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9 Which type of winding wire is used for rewinding submersible pumps? *
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10. Which type of AC single phase motor having low starting torque? *
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11 What is the function of centrifugal switch in single phase motors? *
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12 Which is the application of universal motor? *
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13 Which single phase motor is fitted with wound rotor? *
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14 What is the relation between running winding and starting winding of a single phase induction motor with respect to resistance? *
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15 What is the function of the part marked as x in shaded pole motor? *
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16 How the direction of rotation of a capacitor start induction run motor is reversed? *
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17. Which single phase motor tapped field speed control method is employed? *
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18. Which type of single phase induction motor is used in food mixer? *
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19. What is the angular displacement between starting and running winding of a single phase induction motor? *
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20 Why the hysteresis motor is suitable for sound recording instruments? *
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21. Which motor is preferred for domestic water pumps? *
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22. Which type of motor has relatively small starting torque? *
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23. What is the function of centrifugal switch in split phase motor? *
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24. How to produce starting torque in a shaded pole fan motor? *
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25. What is the reason to use a permanent capacitor in fan motor circuit? *
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26. Which motor is having half coil winding? *
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27. Why running winding is placed in the bottom of the core? *
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28 .Calculate the slot distance for a ceiling fan having 28 slots, 14 poles, 14 coils in half coil connection? *
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29. What is the application of shaded pole motor? *
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30. Which type of single phase motor is used for hard disk drives? *
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31. What is the function of centrifugal switch used in capacitor start, capacitor run induction motor? *
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32. Which type of single phase motor is having very high starting torque than any other type of single phase motor? *
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33. Where the capacitor is connected in a single phase permanent capacitor motor? *
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34. Which motor is used in table fan? *
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35. What is the effect, if coil group connection is wrongly connected in a single phase motor rewinding? *
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36. What is the effect in a repulsion motor, if the magnetic axis shifted to another side? *
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37. What is the effect if the centrifugal switch is not disconnected after the motor starts? *
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38. How the direction of rotation of repulsion motors is to be reversed? *
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39. Why a capacitor is connected across centrifugal switch in the centrifugal switch speed control method? *
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41. What is the effect, if some slots in a split phase motor left out without winding after completion of concentric winding? *
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42. How the radio interference can be suppressed in centrifugal switch method of speed control of universal motor? *
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