Quiz  /  Electric Traction Electrical Engineering MCQ Interview Questions and Answers PDF

  • 1. 
    Which of the following is an advantage of electric traction over other methods of traction ?

  • Faster acceleration
  • No pollution problems
  • Better braking action
  • All of the above

  • 2. 
    Which of the following is the voltage for single phase A.C. system ?

  • 22 V
  • 440 V
  • 5 kV
  • 15 kV
  • None of the above

  • 3. 
    Long distance railways use which of the following ?

  • 200 V D.C.
  • 25 kV single phase A.C.
  • 25 kV two phase A.C.
  • 25 kV three phase A.C.

  • 4. 
    Main traction systems used in India are, those using

  • electric locomotives
  • diesel engine locomotives
  • steam engine locomotives
  • diesel electric locomotives
  • all of the above

  • 5. 
    in India diesel locomotives are manufactured at

  • Ajmer
  • Varanasi
  • Bangalore
  • Jamalpur

  • 6. 
    For diesel locomotives the range of horsepower is

  • 50 to 200
  • 500 to 1000
  • 1500 to 2500
  • 3000 to 5000

  • 7. 
    The horsepower of steam locomotives is

  • up to 1500
  • 1500 to 2000
  • 2000 to 3000
  • 3000 to 4000

  • 8. 
    The overall efficiency of steam locomotive is around

  • 5 to 10 percent
  • 15 to 20 percent
  • 25 to 35 percent
  • 35 to 45 percent

  • 9. 
    In tramways which of the following motors is used ?

  • D.C. shunt motor
  • D.C. series motor
  • A.C. three phase motor
  • AC. single phase capacitor start motor

  • 10. 
    In a steam locomotive electric power is provided through

  • overhead wire
  • battery system
  • small turbo-generator
  • diesel engine generator

  • 11. 
    Which of the following drives is suitable for mines where explosive gas exists ?

  • Steam engine
  • Diesel engine
  • Battery locomotive
  • Any of the above

  • 12. 
    In case of locomotives the tractive power is provided by

  • single cylinder double acting steam engine
  • double cylinder, single acting steam engine
  • double cylinder, double acting steam engine
  • single stage steam turbine

  • 13. 
    Overload capacity of diesel engines is usually restricted to

  • 2 percent
  • 10 percent
  • 20 percent
  • 40 percent

  • 14. 
    In case of steam engines the steam pressure is

  • 1 to 4 kgf/cm2
  • 5 to 8 kgf/cm2
  • 10 to 15 kgf/cm2
  • 25 to 35 kgf/cm2

  • 15. 
    The steam engine provided on steam locomotives is

  • single acting condensing type
  • single acting non-condensing type
  • double acting condensing type
  • double acting non-condensing type

  • 16. 
    Electric locomotives in India are manufactured at

  • Jamalpur
  • Bangalore
  • Chittranjan
  • Gorakhpur

  • 17. 
    The wheels of a train, engine as well as bogies, are slightly tapered to

  • reduce friction
  • increase friction
  • facilitate braking
  • facilitate in taking turns

  • 18. 
    Automatic signalling is used for which of the following trains ?

  • Mail and express trains
  • Superfast trains
  • Suburban and Urban electric trains
  • All trains

  • 19. 
    The efficiency of diesel locomotives is nearly

  • 20 to 25 percent
  • 30 to 40 percent
  • 45 to 55 percent
  • 60 to 70 percent

  • 20. 
    The speed of a superfast train is

  • 60 kmph
  • 75 kmph
  • 100 kmph
  • more than 100 kmph

  • 21. 
    The number of passenger coaches that can be attached to a diesel engine locomotive on broad gauge is usually restricted to

  • 5
  • 10
  • 14
  • 17

  • 22. 
    Which of the following state capitals is not on broad gauge track ?

  • Lucknow
  • Bhopal
  • Jaipur
  • Chandigarh

  • 23. 
    Which of the following is the advantage of electric braking ?

  • It avoids wear of track
  • Motor continues to remain loaded during braking
  • It is instantaneous
  • More heat is generated during braking

  • 24. 
    Which of the following braking systems on the locomotives is costly ?

  • Regenerative braking on electric locomotives
  • Vacuum braking on diesel locomotives
  • Vacuum braking on steam locomotives
  • All braking systems are equally costly

  • 25. 
    Tractive effort is required to

  • overcome the gravity component of train mass
  • overcome friction, windage and curve resistance
  • accelerate the train mass
  • do all of the above

  • 26. 
    For given maximum axle load tractive efforts of AC. locomotive will be

  • less than that of D.C. locomotive
  • more than that of D.C. locomotive
  • equal to that of D.C. locomotive
  • none of the above

  • 27. 
    Co-efficient of adhesion reduces due to the presence of which of the following ?

  • Sand on rails
  • Dew on rails
  • Oil on the rails
  • both (b) and (c)

  • 28. 
    Due to which of the following co-efficient of adhesion improves ?

  • Rust on the rails
  • Dust on the rails
  • Sand on the rails
  • All of the above

  • 29. 
    Quadrilateral speed-time curve pertains to which of the following services ?

  • Main line service
  • Urban service
  • Sub-urban service
  • Urban and sub-urban service

  • 30. 
    Which of the following is the disadvantage of electric traction over other systems of traction ?

  • Corrosion problems in the under-ground pipe work
  • Short time power failure interrupts traffic for hours
  • High capital outlay in fixed installations beside route limitation
  • Interference with communication lines
  • All of the above

  • 31. 
    Co-efficient of adhesion is

  • high in case of D.C. traction than in the case of AC. traction
  • low in case of D.C. traction than in the case of AC. traction
  • equal in both AC. and D.C. traction
  • any of the above

  • 32. 
    Speed-time curve of main line service differs from those of urban and suburban services on following account

  • it has longer free running period
  • it has longer coasting period
  • accelerating and braking periods are comparatively smaller
  • all of the above

  • 33. 
    The rate of acceleration on suburban orurban services is restricted by the consideration of

  • Engine power
  • Track curves
  • Passenger Discomfort
  • Track size

  • 34. 
    The specific energy consumption of a train depends on which of the following ?

  • Acceleration and retardation
  • Gradient
  • Distance covered
  • All of the above

  • 35. 
    The friction at the track is proportional to

  • 1/speed
  • l/(speed)2
  • speed
  • none of the above

  • 36. 
    The air resistance to the movement of the train is proportional to

  • speed
  • (speed)
  • (speed)
  • 1/speed

  • 37. 
    The normal value of adhesion friction is

  • 0.12
  • 0.25
  • 0.40
  • 0.75

  • 38. 
    The pulsating torque exerted by steam locomotives causes which of the following?

  • Jolting and skidding
  • Hammer blow
  • Pitching
  • All of the above

  • 39. 
    Which of the following braking systems is used on steam locomotives ?

  • Hydraulic system
  • Pneumatic system
  • Vacuum system
  • None of the above

  • 40. 
    Vacuum is created by which of the following?

  • Vacuum pump
  • Ejector
  • Any of the above
  • None of the above

  • 41. 
    The resistance encountered by a train in motion is on account of

  • resistance offered by air
  • friction at the track
  • friction at various parts of the rolling stock
  • all of the above

  • 42. 
    Battery operated trucks are used in

  • steel mills
  • power stations
  • narrow gauge traction
  • factories for material transportation

  • 43. 
    method can bring the locomotive to dead stop.

  • Plugging braking
  • Rheostatic braking
  • Regenerative braking
  • None of the above

  • 44. 
    The value of co-efficient of adhesion will be high when rails are

  • greased
  • wet
  • sprayed with oil
  • cleaned with sand

  • 45. 
    The voltage used for suburban trains in D.C. system is usually

  • 12 V
  • 24 V
  • 220 V
  • 600 to 750 V

  • 46. 
    For three-phase induction motors which of the following is the least efficient method of speed control ?

  • Cascade control
  • Pole changing
  • Rheostat control
  • Combination of cascade and pole changing

  • 47. 
    Specific energy consumption becomes

  • more on steeper gradient
  • more with high train resistance
  • less if distance between stops is more
  • all of the above

  • 48. 
    In main line service as compared to urban and suburban service

  • distance between the stops is more
  • maximum speed reached is high
  • acceleration and retardation rates are low
  • all of the above

  • 49. 
    Locomotive having monomotor bogies

  • has better coefficient of adhesion
  • are suited both for passanger as well as freight service
  • has better riding qualities due to the reduction of lateral forces
  • has all above qualities

  • 50. 
    Series motor is not suited for traction duty due to which of the following account ?

  • Less current drain on the heavy load torque
  • Current surges after temporary switching off supply
  • Self relieving property
  • Commutating property at heavy load

  • 51. 
    When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when

  • wheel base of axles is more
  • degree of curvature is more
  • both (a) and (b)
  • none of the above

  • 52. 
    Energy consumption in propelling the train is required for which of the following?

  • Work against the resistance to motion
  • Work against gravity while moving up the gradient
  • Acceleration
  • All of the above

  • 53. 
    An ideal traction system should have

  • easy speed control
  • high starting tractive effort
  • equipment capable of with standing large temporary loads
  • all of the above

  • 54. 
    have maximum unbalanced forces

  • Diesel shunters
  • Steam locomotives
  • Electric locomotives
  • Diesel locomotives

  • 55. 
    Specific energy consumption is affected by which of the following factors ?

  • Retardation and acceleration values
  • Gradient
  • Distance between stops
  • All of the above

  • 56. 
    In case of ________ free running and coasting periods are generally long.

  • main-line service
  • urban service
  • sub-urban service
  • all of the above

  • 57. 
    Overhead lines for power supply to tramcars are at a minimum height of

  • 3 m
  • 6 m
  • 10 m
  • 15 m

  • 58. 
    The return circuit for tramcars is through

  • neutral wire
  • rails
  • cables
  • common earthing

  • 59. 
    Locomotives with monometer bogies have

  • uneven distribution of tractive effect
  • suitability for passanger as well as freight service
  • lot of skidding
  • low co-efficient of adhesion

  • 60. 
    _______ was the first city in India to adopt electric traction.

  • Delhi
  • Madras
  • Calcutta
  • Bombay

  • 61. 
    For 25 kV single phase system power supply frequency is

  • 60 Hz
  • 50 Hz
  • 25 Hz
  • 16 Hz

  • 62. 
    Power for lighting in passanger coach, in a long distance electric train, is provided

  • directly through overhead electric line
  • through individual generator of bogie and batteries
  • through rails
  • through locomotive

  • 63. 
    In India, electrification of railway track was done for the first time in which of the following years ?

  • 1820—1825
  • 1880—1885
  • 1925—1932
  • 1947—1954

  • 64. 
    Suri transmission is

  • electrical-pneumatic
  • mechanical-electrical
  • hydro-mechanical
  • hydro-pneumatic

  • 65. 
    In case of a steam engine an average coal consumption per km is nearly

  • 150 to 175 kg
  • 100 to 120 kg
  • 60 to 80 kg
  • 28 to 30 kg

  • 66. 
    Which of the following happens in Kando system ?

  • Three phase A.C. is converted into D.C.
  • Single phase A.C. is converted into D.C.
  • Single phase supply is converted into three phase system
  • None of the above

  • 67. 
    For which of the following locomotives the maintenance requirements are the least?

  • Steam locomotives
  • Diesel locomotives
  • Electric locomotives
  • Equal in all of the above

  • 68. 
    Which of the following methods is used to control speed of 25 kV, 50 Hz single phase traction ?

  • Reduced current method
  • Tap changing control of transformer
  • Series parallel operation of motors
  • All of the above

  • 69. 
    If the co-efficient of adhesion on dry rails is 0.26, which of the following could be the value for wet rails ?

  • 0.3
  • 0.26
  • 0.225
  • 0.16

  • 70. 
    watt-hours per tonne km is usually the specific energy consumption for suburban services.

  • 15—20
  • 50—75
  • 120—150
  • 160—200

  • 71. 
    The braking retardation is usually in the range

  • 0.15 to 0.30 km phps
  • 0.30 to 0.6 km phps
  • 0.6 to 2.4 km phps
  • 3 to 5 km phps
  • 10 to 15 km phps

  • 72. 
    The rate of acceleration on suburban orurban service is in the range

  • 0.2 to 0.5 km phps
  • 1.6 to 4.0 km phps
  • 5 to 10 km phps
  • 15 to 25 km phps

  • 73. 
    The coasting retardation is around

  • 0.16 km phps
  • 1.6 km phps
  • 16 km phps
  • 40 km phps
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