Utilization of Electrical Energy Mid - II, November - 2014

1.In a steam locomotive electric power is provided through
  • Battery system
  • Diesel engine generator
  • Overhead wire
  • Small turbo generator
Answer: D
2.The advantage of electric traction over other methods is
  • No pollution problems
  • faster acceleration
  • Better braking action
  • all of the above
Answer: D
3.The advantage of electric braking is
  • Is instantaneous
  • more heat is generated during braking
  • It avoids wear of track
  • motor continue to remain loaded during braking
Answer: C
4.The coefficient of adhesion is
  • Same on ac and dc traction systems
  • High in case of dc traction and low in ac traction
  • Low in case of ac traction and high in dc traction
  • none of the above
Answer: C
5.For supply on 25 kV, 50 Hz single phase, suitable motor for electric traction is
  • Ac single phase split phase motor
  • ac single phase universal motor
  • Dc shunt motor
  • dc series motor
Answer: D
6.The coefficient of adhesion is highest when
  • The rails are dry
  • the rails are oiled
  • The rails ark wet with dew
  • the rails are dusty
Answer: A
7.The illumination level in houses is in the range
  • 10-20 lumen/m2
  • 0 - 50 lumen/m2
  • 40-75 lumen/m2
  • 100-140 lumen/m2
Answer: D
8.A zero watt lamp consumes
  • no power
  • about 5 to 7 W power
  • About 15 to W power
  • about 25 to 30 W power
Answer: B
9.Specific energy consumption is least in
  • Urban service
  • Sub-urban service
  • main-line service
  • Equal for all types of services
Answer: C
10.A train has a schedule speed of 36 km per hour on a level track. If the distance between the stations is 2 km and the stoppage is 30 seconds the actual time of run will be
  • 260 seconds
  • 230 seconds
  • 200 seconds
  • 170 seconds
Answer: D
11.The coefficient of adhesion is better in _________________ traction than that in steam traction.
Answer: Electric
12.Distance between stops / (Actual time of run + stop time) is known as _____________ speed.
Answer: Schedule
13.Slipping will take place when tractive effort is __________ than the maximum frictional force between the wheel and the track.
Answer: More
14.The coefficient of adhesion is __________ on wet rails as compared to that on clean dry rails.
Answer: Less
15.The total weight of locomotive and train to be pulled by the locomotive is called __________.
Answer: Dead weight
16.Steep gradient will involve __________ energy consumption.
Answer: More
17.In ac traction, in order to confine the return current through the rails __________ are necessary.
Answer: Booster transformer
18.Single ended fair clay type pantograph is used in __________ traction and diamond type pantograph is used in __________ traction
Answer: AC, DC
19.A lamp has a total luminous flux of 1,570 lumens. Its MSCP is ____________________
Answer: 125
20.____________________ lamp has least capacity to sustain voltage fluctuations.
Answer: Incandescent