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