2 Jul 2025 ELECTRICIAN 2nd YEAR MODULE – DC Generator 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 <<1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556>> 0% Question 1 of 56 1. 14. How many parallel paths are there in a duplex lap winding of a 4-pole DC generator? 8 12 4 6Question 1 of 56Question 2 of 56 2. 26. What is the name of the generator if its field is connected in parallel with the armature? Shunt generator Series generator Compound generator Self-excited generatorQuestion 2 of 56Question 3 of 56 3. 20. What is the name of the compound generator if the shunt field is connected in parallel with the armature? Long shunt compound Differential compound Cumulative compound Short shunt compoundQuestion 3 of 56Question 4 of 56 4. 40. Which metal is used for large-capacity DC generator yokes? Soft iron Aluminium Cast iron Rolled steelQuestion 4 of 56Question 5 of 56 5. 53. What happens if a DC generator is idle for a long time? Field coil resistance increases Loss of residual magnetism Increased armature reaction Armature resistance increasesQuestion 5 of 56Question 6 of 56 6. 38. What is the purpose of resistance wire in commutator connections? Smooth current direction reversal Increase statically induced EMF Nullify statically induced EMF Maintain constant voltageQuestion 6 of 56Question 7 of 56 7. 11. What is the formula for dynamically induced emf? BLV volts BLV cosθ volts BLV sinθ volts BL sinθ voltsQuestion 7 of 56Question 8 of 56 8. 4. Which formula is used to calculate the generated emf in a DC generator? ACDBQuestion 8 of 56Question 9 of 56 9. 6. What is the name of the part marked 'X' in a DC generator (pole assembly)? Pole tip Pole core Pole coil Pole shoeQuestion 9 of 56Question 10 of 56 10. 29. Which material is used to make brushes in generators? Steel and graphite Carbon and graphite Cast iron and graphite Aluminium and graphiteQuestion 10 of 56Question 11 of 56 11. 56. What causes heavy sparking in DC generator brushes? Shift in MNA and GNA positions Short circuit in field winding Excessive brush spring tension Short circuit in armature windingQuestion 11 of 56Question 12 of 56 12. What is the name of the DC generator described as having cumulative short shunt compounding? Differential short shunt compound Cumulative short shunt compound Cumulative long shunt compound Differential long shunt compoundQuestion 12 of 56Question 13 of 56 13. 25. What is the reason a DC generator fails to build up voltage? High armature resistance Loose brush contact Field resistance above critical value Prime mover running above rated speedQuestion 13 of 56Question 14 of 56 14. 42. Which voltage is induced dynamically in a DC generator? Oscillating voltage Pulsating voltage Direct current voltage Alternating voltageQuestion 14 of 56Question 15 of 56 15. 35. Which DC generator works without residual magnetism? Separately excited generator Shunt generator Compound generator Series generatorQuestion 15 of 56Question 16 of 56 16. 41. What is the function of split rings in a DC generator? Opposite direction output Unidirectional output Collect output from alternate conductors Continuous output supplyQuestion 16 of 56Question 17 of 56 17. 15. Name the part of a DC generator that consists of thin laminated sheets to reduce eddy currents. Pole shoe lamination Side end plates Armature core lamination Commutator segmentQuestion 17 of 56Question 18 of 56 18. 28. What is the function of split rings in a DC generator? Increase terminal voltage beyond rated Maintain constant voltage Reduce voltage drop at brushes Collect current unidirectionallyQuestion 18 of 56Question 19 of 56 19. 43. What is the purpose of the slot marked 'X' in a DC generator? Enable air circulation Easy shaft removal Fix the keyway LubricationQuestion 19 of 56Question 20 of 56 20. 17. What is the necessity of residual magnetism in a self-excited DC generator? To reduce the field current To reduce armature current To maintain constant output voltage To build up the voltageQuestion 20 of 56Question 21 of 56 21. 3. Which rule is used to find the direction of induced emf in a DC generator? Fleming's right hand rule Cork screw rule Fleming's left hand rule Right hand palm ruleQuestion 21 of 56Question 22 of 56 22. 50. What is the effect of armature reaction in DC generators? Pulsating output voltage Increased output voltage Decreased output voltage Zero output voltageQuestion 22 of 56Question 23 of 56 23. 18. Which two points measure the brush contact resistance in DC machines? Resistance between brush and armature conductors Resistance between the opposite brushes Resistance between brush and commutator riser Resistance between brush and commutatorQuestion 23 of 56Question 24 of 56 24. 23. Why should a DC generator run only in the clockwise direction? Avoid short circuit in armature Avoid generator overloading Protect brushes from damage Protect residual magnetismQuestion 24 of 56Question 25 of 56 25. 16. How are interpoles connected in a DC generator? In parallel with the armature In series with the armature In series with the shunt field In parallel with the shunt fieldQuestion 25 of 56Question 26 of 56 26. 27. What is the purpose of pole shoes in a DC generator? Reduce air gap Minimize magnetic losses Spread flux uniformly in the air gap Increase field strengthQuestion 26 of 56Question 27 of 56 27. 51. Calculate the EMF generated in a 4-pole, simplex wave-wound DC generator with 1020 conductors at 1500 rpm and 0.007 Wb flux/pole. 178 V 428 V 357 V 243 VQuestion 27 of 56Question 28 of 56 28. 52. How is armature reaction neutralized in large DC generators? Compensating winding Additional interpoles Increased brush contact resistance Resistance wires in windingsQuestion 28 of 56Question 29 of 56 29. 1. What is the name of the part marked as 'X' in a DC generator? Commutator segment Armature core Commutator riser BrushQuestion 29 of 56Question 30 of 56 30. 36. Which DC generator is used for arc welding? Differential compound generator Shunt generator Series generator Cumulative compound generatorQuestion 30 of 56Question 31 of 56 31. 34. Which method improves insulation resistance in DC generators? Regular commutator cleaning Periodic machine heating Frequent brush replacement Blowing hot air during maintenanceQuestion 31 of 56Question 32 of 56 32. 7. What is the name of the DC generator that requires separate excitation? Compound generator Separately excited generator Shunt generator Series generatorQuestion 32 of 56Question 33 of 56 33. 24. Why is compensating winding provided in large DC generators? Neutralize armature reaction effect Increase generator efficiency Reduce commutation effect Connect more loadsQuestion 33 of 56Question 34 of 56 34. 39. Why are solid pole shoes used in DC generators? Increase residual magnetism Reduce copper loss Reduce magnetic path reluctance Decrease residual magnetismQuestion 34 of 56Question 35 of 56 35. 55. What happens to induced EMF if main field flux distorts in a DC generator? No change in EMF EMF increases EMF decreases EMF becomes zeroQuestion 35 of 56Question 36 of 56 36. 5. What is the formula to calculate back emf of a DC motor? CBDAQuestion 36 of 56Question 37 of 56 37. 46. Why are pole core stampings laminated in DC generators? Reduce windage loss Reduce hysteresis loss Reduce friction loss Reduce eddy current lossQuestion 37 of 56Question 38 of 56 38. 22. Why is the armature resistance of a DC generator kept very low? Reduce armature current Reduce temperature of armature Reduce armature voltage drop Run armature with less weightQuestion 38 of 56Question 39 of 56 39. 8. Which type of energy is converted into electrical energy by a generator? Kinetic energy Heat energy Chemical energy Mechanical energyQuestion 39 of 56Question 40 of 56 40. 49. What happens if shunt field resistance exceeds critical value in a DC generator? Voltage buildup failure Pulsating output voltage Normal voltage buildup Above-normal output voltageQuestion 40 of 56Question 41 of 56 41. 21. Why is the armature core of a DC generator laminated? Reduce copper loss Reduce hysteresis loss Reduce friction loss Reduce eddy current lossQuestion 41 of 56Question 42 of 56 42. 54. Calculate the induced EMF of a 4-pole, lap-wound dynamo at 1000 rpm with 600 conductors and 0.064 Wb flux/pole. 160 V 640 V 480 V 320 VQuestion 42 of 56Question 43 of 56 43. 47. Which DC generator is used for electroplating? Cumulative compound generator Shunt generator Differential compound generator Series generatorQuestion 43 of 56Question 44 of 56 44. 19. Which voltage drop is indicated in the portion marked as 'X' in a DC generator? Armature voltage drop Full load voltage drop Shunt field voltage drop Armature reaction dropQuestion 44 of 56Question 45 of 56 45. 48. What is the purpose of compensating winding in DC generators? Maintain constant output voltage Minimize rough commutation Neutralize demagnetizing effect Decrease field coil excitation currentQuestion 45 of 56Question 46 of 56 46. 9. What is the name of the DC generator's field where the series field opposes the shunt field? Differential compound generator Short shunt compound generator Cumulative compound generator Long shunt compound generatorQuestion 46 of 56Question 47 of 56 47. 12. Which rule is used to find the direction of a magnetic field? Cork screw rule Right hand palm rule Fleming’s right hand rule Fleming’s left hand ruleQuestion 47 of 56Question 48 of 56 48. 33. Which DC generator is used for long-distance distribution lines? Shunt generator Differential compound generator Series generator Cumulative compound generatorQuestion 48 of 56Question 49 of 56 49. 30. Why do DC generators lose residual magnetism? Continuous no-load running Frequent direction changes of rotation Uninterrupted operation Heavy short circuit in loadQuestion 49 of 56Question 50 of 56 50. 31. How does the magnetic circuit complete through the yoke and poles in a generator? Armature winding conductors Laminated pole core Field coils Armature coreQuestion 50 of 56Question 51 of 56 51. 13. What is the name of the part of a DC generator that provides mechanical support and a path for magnetic flux? Pole core Yoke (or frame) Stator Pole shoesQuestion 51 of 56Question 52 of 56 52. 32. Why does terminal voltage decrease with increased load in a DC shunt generator? Increased armature resistance Armature reaction effect Increased shunt field inductance Reduced brush voltage dropQuestion 52 of 56Question 53 of 56 53. 10. What is the principle of a DC generator? Cork screw rule Fleming’s right hand rule Faraday’s laws of electromagnetic induction Fleming’s left hand ruleQuestion 53 of 56Question 54 of 56 54. 45. Which metal is used for pole cores in large DC generators? Cast steel Stainless steel Soft iron Cast ironQuestion 54 of 56Question 55 of 56 55. 37. What is the property of wave winding in DC generators? Low current, high voltage High current, high voltage High current, low voltage Low current, low voltageQuestion 55 of 56Question 56 of 56 56. 44. What is the purpose of field coils in a DC generator? Increase magnetic path reluctance Increase air gap flux Magnetize poles to produce flux Reduce magnetizing currentQuestion 56 of 56 Loading...
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