64. Minimum composite sleeper index for wooden sleepers used in cross-overs, is
A.1152
B.1252
C.1352
D. 1452 none of these.

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65. Top surface of steel sleepers, is
A. kept level throughout
B. provided a cant of 1 in 20 inward
C. provided a cant of 1 in 20 outward
D. none of these.

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66.  Steel sleepers are
A. rectangular is cross section throughout
B. hollow circular pipes
C. 6 mm thick steel sheets with ends bent down
D. 6 mm thick steel sheets with ends bent up.

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67. Rails are fixed on steel sleepers
A. by bearing plates
B. by dog spikes
C. by keys in lugs or jaws
D. none of these.

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68.  To prevent creep in rails, the steel sleepers are fixed with rails by clips, bolts and
A. one key
B. two keys
C. three keys
D. four keys.

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69. Main disadvantage of steel sleepers, is :
A. it gets rusted quickly
B. its lugs some times get broken
C. its lugs some times get split
D. all the above.

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70.  Cast iron sleeper, is
A. pot sleeper
B. box sleeper
C. Duplex sleeper
D. All the above.

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