ELECTRICIAN 2nd YEAR MODULE – AC Single Phase Motor ONLINE TEST July 2, 2025July 2, 2025 by admin TRANSLATE THIS QUIZ IN YOUR LANGUAGE इस प्रश्नोत्तरी का अपनी भाषा में अनुवाद करें <<1234567891011121314151617181920212223242526272829303132333435363738394041>> 0% Question 1 of 41 1. 1. What is the working principle of single phase induction motor? Joule's law Lenz's law Faraday's laws of electrolysis Faraday's laws of electromagnetic inductionQuestion 1 of 41Question 2 of 41 2. 8. What is the purpose of the capacitor (C) in centrifugal switch speed control method of universal motor? Improve the power factor Maintain constant speed Protect from the over loading Reduce the sparks on the contactsQuestion 2 of 41Question 3 of 41 3. 41. How the radio interference can be suppressed in centrifugal switch method of speed control of universal motor? By connecting an inductor in series with centrifugal switch By connecting capacitor across centrifugal switch By adding compensating winding with armature By connecting capacitor in series with centrifugal switchQuestion 3 of 41Question 4 of 41 4. 28. Calculate the slot distance for a ceiling fan with 28 slots, 14 poles, and 14 coils in half-coil connection? 240° 180° 120° 90°Question 4 of 41Question 5 of 41 5. 17. Which single phase motor tapped field speed control method is employed? Universal motor Capacitor start induction run motor Capacitor start capacitor run motor Shaded pole motorQuestion 5 of 41Question 6 of 41 6. 12. Which is the application of universal motor? Compressor Jet pump Teleprinter Food mixerQuestion 6 of 41Question 7 of 41 7. 39. Why a capacitor is connected across centrifugal switch in the centrifugal switch speed control method? To reduce the sparks in contacts To protect from over loading To maintain constant speed To improve the power factorQuestion 7 of 41Question 8 of 41 8. 33. Where is the capacitor connected in a single-phase permanent capacitor motor? In series with starting winding In parallel with starting winding In series with running winding In parallel with running windingQuestion 8 of 41Question 9 of 41 9. 5. Which type of A.C single phase motor is classified under commutator motor type? Permanent capacitor motor Repulsion motor Shaded pole motor Stepper motorQuestion 9 of 41Question 10 of 41 10. 9. Which type of winding wire is used for rewinding submersible pumps? Super enamelled copper wire Double cotton covered copper wire Single cotton covered copper wire PVC covered copper wireQuestion 10 of 41Question 11 of 41 11. 19. What is the angular displacement between starting and running winding of a single phase induction motor? 45 electrical degree 120 electrical degree 90 electrical degree 60 electrical degreeQuestion 11 of 41Question 12 of 41 12. 29. What is the application of a shaded pole motor? Ceiling fan Wet grinder Washing machine Hair dryerQuestion 12 of 41Question 13 of 41 13. 26. Which motor is having half-coil winding? None of the above Washing machine Ceiling fan Mixer GrinderQuestion 13 of 41Question 14 of 41 14. 11. What is the function of centrifugal switch in single phase motors? Break the starting winding Protect the motor from over loading Break the running winding Maintain constant speedQuestion 14 of 41Question 15 of 41 15. 37. What is the effect if the centrifugal switch is not disconnected after the motor starts? Motor will stop immediately Starting winding will burn out Motor will run very slow speed Motor will run normallyQuestion 15 of 41Question 16 of 41 16. 16. How the direction of rotation of a capacitor start induction run motor is reversed? By changing the capacitor connections By interchanging main winding terminals By interchanging both main and auxiliary winding terminals By changing the supply terminalsQuestion 16 of 41Question 17 of 41 17. 27. Why is the running winding placed at the bottom of the core? To get low resistance To get high resistance To get high inductance To get low inductanceQuestion 17 of 41Question 18 of 41 18. 4. Which type of single phase motor is illustrated? Permanent capacitor motor Capacitor start induction run motor Capacitor start capacitor run motor Universal motorQuestion 18 of 41Question 19 of 41 19. 6. Which method is adopted to start the single phase induction motor? Varying supply voltage method Reversal of running coil connection Reversal of input supply terminals Split phase methodQuestion 19 of 41Question 20 of 41 20. 20. Why the hysteresis motor is suitable for sound recording instruments? Less error operation Small in size Noiseless operation High efficiencyQuestion 20 of 41Question 21 of 41 21. 15. What is the function of the part marked as 'x' in shaded pole motor? Strengthen the magnetic field Initiate the rotor movement Increase the efficiency Maintain constant speedQuestion 21 of 41Question 22 of 41 22. 40. What is the effect, if some slots in a split phase motor left out without winding after completion of concentric winding? Reduction in torque Works normally Reduction in speed Runs with very high speedQuestion 22 of 41Question 23 of 41 23. 36. What is the effect in a repulsion motor, if the magnetic axis shifted to another side? Direction of rotation will change Motor speed increases from rated speed Motor speed will reduce from rated speed Direction of rotation remains sameQuestion 23 of 41Question 24 of 41 24. 18. Which type of single phase induction motor is used in food mixer? Repulsion motor Permanent capacitor motor Universal motor Shaded pole motorQuestion 24 of 41Question 25 of 41 25. 32. Which type of single-phase motor has very high starting torque? Universal motor Reluctance motor Capacitor start induction run motor Repulsion start induction run motorQuestion 25 of 41Question 26 of 41 26. 24. How to produce starting torque in a shaded pole fan motor? Interchanging the field coil windings by switch Using rings on poles Interchanging cage rotor windings by switch Using capacitor on winding circuitsQuestion 26 of 41Question 27 of 41 27. 13. Which single phase motor is fitted with wound rotor? Repulsion motor Capacitor start capacitor run motor Permanent capacitor motor Shaded pole motorQuestion 27 of 41Question 28 of 41 28. 25. What is the reason to use a permanent capacitor in a fan motor circuit? Lower power consumption Speed regulation Splitting of phase for torque Controlling electrical interferenceQuestion 28 of 41Question 29 of 41 29. 21. Which motor is preferred for domestic water pumps? Universal Motor Capacitor start motor Repulsion motor Shaded pole motorQuestion 29 of 41Question 30 of 41 30. 14. What is the relation between running winding and starting winding of a single phase induction motor with respect to resistance? Running winding is more, starting winding less Running winding is less, starting winding infinity Running winding is less, starting winding more Both resistances will be equalQuestion 30 of 41Question 31 of 41 31. 7. What is the type of A.C single phase motor? Capacitor start induction run motor Capacitor start capacitor run motor Permanent capacitor motor Induction start induction run motorQuestion 31 of 41Question 32 of 41 32. 22. Which type of motor has relatively small starting torque? Universal motor Resistance start induction run motor Capacitor start induction run motor Capacitor start capacitor run motorQuestion 32 of 41Question 33 of 41 33. 23. What is the function of a centrifugal switch in a split-phase motor? Protects the motor from overloading Make and break the starting winding from supply Protects from overcurrent Maintains constant speedQuestion 33 of 41Question 34 of 41 34. 10. Which type of AC single phase motor having low starting torque? Capacitor start induction run motor Induction start induction run motor Capacitor start capacitor run motor Resistance start induction run motorQuestion 34 of 41Question 35 of 41 35. 2. What is the name of single phase motor? Induction start capacitor run motor Capacitor start induction run motor Permanent capacitor motor Capacitor start capacitor run motorQuestion 35 of 41Question 36 of 41 36. 31. What is the function of a centrifugal switch in a capacitor start, capacitor run induction motor? Disconnect both windings after reaching 75-80% speed Disconnect the starting capacitor after reaching 75-80% speed Disconnect the starting winding after reaching 75-80% speed Disconnect the running winding after reaching 75-80% speedQuestion 36 of 41Question 37 of 41 37. 34. Which motor is used in a table fan? Universal motor Eddy current motor Shaded pole motor Permanent capacitor motorQuestion 37 of 41Question 38 of 41 38. 30. Which type of single-phase motor is used for hard disk drives? Hysteresis motor Reluctance motor Stepper motor Repulsion motorQuestion 38 of 41Question 39 of 41 39. 3. What is the working principle of split phase motor? Faraday's laws of electrolysis Faraday's laws of electromagnetic induction Joule's law Lenz's lawQuestion 39 of 41Question 40 of 41 40. 38. How the direction of rotation of repulsion motors is to be reversed? By changing the main winding terminals By interchanging the supply terminals By changing the compensating winding terminals By shifting the brush-axisQuestion 40 of 41Question 41 of 41 41. Here's the Aiken format for questions 35-41 with explanations: Motor runs in very high speed. What is the effect, if coil group connection is wrongly connected in a single phase motor rewinding? Motor runs slowly Motor will not run Motor runs and takes more current at no loadQuestion 41 of 41 Loading...
