85.  In permanent way, ballast
A. transfers load from sleepers to the formation
B. provides an elastic bed to the track
C. provides a drainage of track
D. all the above.

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86.  Packing of ballast is done
A. near the ends of sleepers
B. on the shoulders
C. under sleepers
D. between two rails.

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87. Boxing of ballast is done
A. under rails
B. at the rails
C. in between two rails
D. in between two sleepers.

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88. For flat bottom sleepers, maximum size of ballast, is
A. 50 mm
B. 40.mm
C. 33 mm
D. 25 mm

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89.  For metal sleepers with rounded edges, maximum size of ballast, is
A. 50 mm
B. 40 mm
C. 30 mm
D. 25 mm

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90. For points and crossings, maximum size of ballast, is
A. 50 mm
B. 40 mm
C. 30 mm
D. 25 mm

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91. Sand may be used as ballast for
A. wooden sleepers
B. steel sleepers
C. cast iron sleepers
D. all the above.

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