ELECTRICIAN 2nd YEAR MODULE – DC Motor MCQ June 13, 2026July 2, 2025 by admin TRANSLATE THIS QUIZ IN YOUR LANGUAGE इस प्रश्नोत्तरी का अपनी भाषा में अनुवाद करें [google-translator] <<1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768>> 0% Question 1 of 68 1. 34. How No volt coil is connected in a three point starter with DC shunt motor? Directly connected to supply Connected in series with shunt field Connected in parallel with armature Connected in series with armatureQuestion 1 of 68Question 2 of 68 2. 58. What is the operation in the rewinding process? Cutting of winding wire Cleaning of slots Removing of winding Removing of wedgesQuestion 2 of 68Question 3 of 68 3. 63. Why the newly rewound armature must be preheated before varnishing? Maintain uniform spreading of varnishing Make easy to penetrate varnish inside Drive out the moisture from it Help for quick drying of varnishQuestion 3 of 68Question 4 of 68 4. 46. What is the necessity of starter for D.C motor? Limit the field voltage Limit the field current Limit the armature current Control the motor speedQuestion 4 of 68Question 5 of 68 5. 67. What is the reason for reduction in speed of a D.C shunt motor from no load to full load? Shunt field current increases Shunt field current decreases Armature voltage drop increases Armature voltage drop decreasesQuestion 5 of 68Question 6 of 68 6. 12. Name the type of DC motor. Series motor Short shunt compound motor Long shunt compound motor Shunt motorQuestion 6 of 68Question 7 of 68 7. 44. Which type of D.C motor is suitable for shearing machines? Cumulative compound motor Series motor Shunt motor Differential compound motorQuestion 7 of 68Question 8 of 68 8. 7. Which rule determines the direction of rotation of armature in D.C motor? Fleming's left hand rule Right hand grip rule Fleming's right hand rule Right hand palm ruleQuestion 8 of 68Question 9 of 68 9. 51. Which type of DC motor is used for sudden application of heavy loads? Series motor Differential compound motor Shunt motor Cumulative compound motorQuestion 9 of 68Question 10 of 68 10. 50. What is the purpose of NVC connected in series with the field in 3 point starter? To prevent increase in speed To decrease the back emf Reduce the field current To improve the torqueQuestion 10 of 68Question 11 of 68 11. 37. Which speed control method is applied to obtain both below normal and above normal speed in DC motor? Armature control method Ward Leonard speed control Tapped field speed control Field control methodQuestion 11 of 68Question 12 of 68 12. 59. Which insulating material used in winding is a highly non-hygroscopic and possess good electrical strength? Leatheroid paper Triplex paper Millinex paper Empire clothQuestion 12 of 68Question 13 of 68 13. 30. Why the series field is short circuited at the time of starting in differential compound motor? To maintain proper direction of rotation To reduce the starting current To decrease the speed of motor To increase the speed of motorQuestion 13 of 68Question 14 of 68 14. 29. Why series motor produce high torque and speed initially without load? Absence of back emf Series field winding wound with thick wire Armature current and field current are same Load current flows through field windingQuestion 14 of 68Question 15 of 68 15. 55. Which type of DC armature winding the front pitch (YF) is greater than back pitch (YB)? Wave winding Progressive winding Retrogressive winding Lap windingQuestion 15 of 68Question 16 of 68 16. 64. How the direction of rotation of a DC compound motor is changed? By changing the direction of series field current By interchanging the supply terminals By changing the direction of armature current By changing the direction of both field and armature currentQuestion 16 of 68Question 17 of 68 17. 2. Which instrument is used to test armature winding for short and open circuit? Internal Growler Digital multimeter External Growler Tong TesterQuestion 17 of 68Question 18 of 68 18. 8. What is the name of D.C motor? D.C differential compound motor D.C series motor D.C cumulative compound motor D.C shunt motorQuestion 18 of 68Question 19 of 68 19. 22. Which insulating material belongs to class 'B' insulation? Leatheroid paper Bamboo Cotton Fiber glassQuestion 19 of 68Question 20 of 68 20. 52. Which speed control method is used in food mixture motors? Field diverter control method Series field tapping method Voltage control method Armature diverter methodQuestion 20 of 68Question 21 of 68 21. 16. What is the purpose of series resistor connected with holding coil in a D.C four point starter? Increase the voltage in holding coil Decrease the voltage in holding coil Increase the current in holding coil Limit the current in holding coilQuestion 21 of 68Question 22 of 68 22. 15. What is the name of winding, if coil pitch is less than pole pitch? Full pitch winding Short chorded winding Long chorded winding Half pitch windingQuestion 22 of 68Question 23 of 68 23. 43. Which type of speed control of D.C series motor? Field tapping method Field parallel method Armature diverter method Field diverter methodQuestion 23 of 68Question 24 of 68 24. 47. Which type of instrument is used to test the armature winding? Ohmmeter Multimeter Growler MeggerQuestion 24 of 68Question 25 of 68 25. 25. Which type of DC motor is used in elevators? DC cumulative compound motor DC shunt motor DC differential compound motor DC series motorQuestion 25 of 68Question 26 of 68 26. 14. What is the name of the equipment? External growler Internal growler Megger Earth resistance testerQuestion 26 of 68Question 27 of 68 27. 36. Which growler test for armature is illustrated? Shorted commutator test Grounded coil test Open coil test Shorted coil testQuestion 27 of 68Question 28 of 68 28. 31. Which is the most effective method of balancing armature? Dynamic balancing Plugged with lead weight balancing Attached with counter balancing Static balancingQuestion 28 of 68Question 29 of 68 29. 19. Why the direction of rotation is changed only by changing the armature current direction in a D.C compound motor? Prevent motor from over loading Maintain motor characteristics Avoid armature reaction effect Maintain rated speedQuestion 29 of 68Question 30 of 68 30. 5. Which formula is used to calculate the speed of DC motor?Question 30 of 68Question 31 of 68 31. 56. What reduces the cross sectional area of core material for VA rating? Normal steel sheet Low alloy sheet Dynamo sheet High alloy sheetQuestion 31 of 68Question 32 of 68 32. 1. Which instrument is used to measure armature winding resistance? Kelvin bridge Multimeter Series type Ohm meter MeggerQuestion 32 of 68Question 33 of 68 33. 17. Which speed control method of D.C series motor is used for electric train? Field diverter method Supply voltage control method Field tapping method Armature diverter methodQuestion 33 of 68Question 34 of 68 34. 10. What is the formula to calculate the current taken by D.C shunt motor armature?Question 34 of 68Question 35 of 68 35. 6. How many parallel paths in duplex lap winding in the armature of 4 pole D.C Motor? 8 2 4 6Question 35 of 68Question 36 of 68 36. 23. What is the temperature value of class 'F' insulation? 105°C 120°C 155°C 90°CQuestion 36 of 68Question 37 of 68 37. 42. Why the D.C series motor field winding is wound with thick wire? To regulate field voltage To reduce the armature reaction To carry the load current To keep maximum inductanceQuestion 37 of 68Question 38 of 68 38. 54. What is the purpose of tapes in winding? Bind the coils Insulate exposed conductors Insulate slots Wrap the conductorQuestion 38 of 68Question 39 of 68 39. 18. Why shunt field coil is connected in series with holding coil in D.C three point starter? Protect the shunt field from over current Increase the holding coil current Decrease the holding coil current Protect the motor in case of open in shunt fieldQuestion 39 of 68Question 40 of 68 40. 20. Which speed control methods offers below normal speed in DC shunt motor? Field control method Voltage control method Ward Leonard system of speed control Armature control methodQuestion 40 of 68Question 41 of 68 41. 21. Why starters are required to start D.C motors in industries? Reduce the armature current Smooth operation of motors Control the armature reaction Regulate the field voltageQuestion 41 of 68Question 42 of 68 42. 4. Which winding wire is used for DC field coil? Super enameled copper wire PVC covered copper winding wire Double silk covered copper wire Single silk covered copper wireQuestion 42 of 68Question 43 of 68 43. 32. Which material is used for starting resistance of DC starters? Eureka Manganin Constantine NichromeQuestion 43 of 68Question 44 of 68 44. 68. Which winding fault is determined by the test? Grounded core fault Open coil fault Short coil fault Grounded coil faultQuestion 44 of 68Question 45 of 68 45. 38. Why commutators are sparking heavily? Incorrect armature connection Incorrect field connection Incorrect direction of rotation Incorrect brush positionQuestion 45 of 68Question 46 of 68 46. 35. Which type of armature winding is illustrated? Triplex lap winding Quadruplex lap winding Simplex lap winding Duplex lap windingQuestion 46 of 68Question 47 of 68 47. 57. How to obtain opposite polarity in adjacent poles of a 4 pole DC motor? Making current flow in different direction Making parallel connection of coils Varying the number of turns in coil Making series connection of coilsQuestion 47 of 68Question 48 of 68 48. 45. Where D.C compound motors are preferred? Constant speed under varying load requirements Constant speed requirements Constant load requirements High starting torque requirementsQuestion 48 of 68Question 49 of 68 49. 62. Which type of test is illustrated for the armature after rewound? Grounded coil test Voltage drop test Open coil test Shorted coil testQuestion 49 of 68Question 50 of 68 50. 39. What is the action of the induced emf in a running D.C motor? Decreases the armature current Assists the applied voltage Opposes the applied voltage Increases the armature currentQuestion 50 of 68Question 51 of 68 51. 33. Which DC compound motor is operated at constant speed under varying load? Differential short shunt Cumulative short shunt Differential long shunt Cumulative long shuntQuestion 51 of 68Question 52 of 68 52. 41. What is the purpose of resistor connected with holding coil in 4 point starter? Limit current in NVC Protect the armature from short circuit Protect the coil from short circuit Protect the motor from overloadQuestion 52 of 68Question 53 of 68 53. 24. Which type of D.C motor is used for constant speed drives? Differential long shunt compound motor DC shunt motor Differential short shunt compound motor DC series motorQuestion 53 of 68Question 54 of 68 54. 40. Which motor has this characteristics curve? Cumulative compound motor Shunt motor Differential compound motor Series motorQuestion 54 of 68Question 55 of 68 55. 26. Which method of speed control gives below the rated speed in DC series motor? Field diverter method Tapped field method Voltage control method Armature diverter methodQuestion 55 of 68Question 56 of 68 56. 48. Why the holding coil of a 3 point starter is connected in series with shunt field? To limit the load current To protect the motor from high speed To hold the handle plunger firmly To run motor at low voltageQuestion 56 of 68Question 57 of 68 57. 9. Which rule determines the direction of current in D.C motor? Fleming's right hand rule Fleming's left hand rule Right hand palm rule Right hand grip ruleQuestion 57 of 68Question 58 of 68 58. 53. Which speed control system provides a smooth variation of speed from zero to above normal? Field control Ward-Leonard system control Field diverter control Armature controlQuestion 58 of 68Question 59 of 68 59. 3. What is the name of the speed control method of DC motor? Armature diverter method Field tapping method Voltage control method Field diverter methodQuestion 59 of 68Question 60 of 68 60. 61. Calculate the average pitch (YA ) for retrogressive wave winding, if No. of armature conductor = 14, No. of slots = 7, No. of poles = 2 8 6 14 4Question 60 of 68Question 61 of 68 61. 27. What is the effect, if a four point starter resistance is cutoff during running? Motor stopped Runs at very high speed Runs at slow speed Runs at reverse directionQuestion 61 of 68Question 62 of 68 62. 60. Which type of armature winding is illustrated? Duplex wave winding Triplex wave winding Retrogressive lap winding Progressive lap windingQuestion 62 of 68Question 63 of 68 63. 11. Which rule is applied to identify the direction of flux in DC motor? Cork's screw rule Fleming's left hand rule Fleming's right hand rule Right hand grip ruleQuestion 63 of 68Question 64 of 68 64. 65. What is the effect in a D.C shunt motor, if its supply terminals are interchanged? Runs in the same direction Runs in high speed Runs in the reverse direction Runs in slow speedQuestion 64 of 68Question 65 of 68 65. 49. What is the best method to change the DOR of a compound motor without change of its characteristics? Change the current in armature and shunt field together Change series field current direction Change armature current direction Change shunt field current directionQuestion 65 of 68Question 66 of 68 66. 13. What is the formula to calculate back EMF in a DC motor?Question 66 of 68Question 67 of 68 67. 28. Why carbon composition brush requires in the armature circuit to operate the D.C motor? Protects from armature reaction Protects armature from over loading Reduces the spark in the commutator segment Increases the starting torqueQuestion 67 of 68Question 68 of 68 68. 66. What is the speed, if field winding of a DC shunt motor is in open circuit? Runs at slow speed Motor runs normally Stop running Runs in very high speedQuestion 68 of 68 Loading...
