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