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Q: The items given in options pertain to different aspects or functionalities of track design in railway engineering. Select the INCORRECT combination.
  • A. Ballast : Granular matters laid over the earth formation to provide suitable bed for the sleepers on which they can rest
  • B. Ruling gradient : Maximum gradient to which a track may be laid in a particular section
  • C. Marshalling yard : To separate goods wagons received from various centers in the order of stations to which they are to be sent
  • D. Pusher gradient : Rising gradient which is followed by a falling gradient and along which the train climbs easily due to momentum gained by them over the falling gradient
Correct Answer: Option D - Pusher gradient–When the grade is to steep as to necessitate the help of an extra engine for pushing the train, it is called the pusher grade. The extra engine so used is called banking engine. Moment gradient–It is the grade steeper than the ruling gradient. This can be overcome by a train due to its own momentum gathered on its run. Ruling gradient–The steepest grade which exists in a particular section is called ruling gradient as it limits the maximum weight of the train which can be hauled by a locomotive on that particular section.
D. Pusher gradient–When the grade is to steep as to necessitate the help of an extra engine for pushing the train, it is called the pusher grade. The extra engine so used is called banking engine. Moment gradient–It is the grade steeper than the ruling gradient. This can be overcome by a train due to its own momentum gathered on its run. Ruling gradient–The steepest grade which exists in a particular section is called ruling gradient as it limits the maximum weight of the train which can be hauled by a locomotive on that particular section.

Explanations:

Pusher gradient–When the grade is to steep as to necessitate the help of an extra engine for pushing the train, it is called the pusher grade. The extra engine so used is called banking engine. Moment gradient–It is the grade steeper than the ruling gradient. This can be overcome by a train due to its own momentum gathered on its run. Ruling gradient–The steepest grade which exists in a particular section is called ruling gradient as it limits the maximum weight of the train which can be hauled by a locomotive on that particular section.