Railway Engineering

251. To avoid the damage of nose of crossing, the wing rails are ramped so that nose of crossing remains at a lower level by

1. 3 mm
2. 4 mm
3. 5 mm
4. 6 mm

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252. To design a cross-over between parallel tracks, the required components are:

1. Two switch points, two acute angle crossings and two check rails
2. Two switch points, two acute angle crossings and four check rails
3. Two switch points, two acute angle crossings and six check rails
4. None of these

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253. To ensure exact gauge, the gauge tie plates are provided at

1. Toe of the switch
2. Nose of crossing
3. Both (A) and (B)
4. None of the above

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254. To prevent creep in rails, the steel sleepers are fixed with rails by clips, bolts and

1. One key
2. Two keys
3. Three keys
4. Four keys

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255. To prevent percolation of water into formation, moorum is used as a blanket for

1. Black cotton soil
2. Sandy soil
3. Clayey soil
4. All the above

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256. Top surface of steel sleepers, is

1. Kept level throughout
2. Provided a cant of 1 in 20 inward
3. Provided a cant of 1 in 20 outward
4. None of these

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257. Total effective bearing area of both the bowls of a pot sleeper, is

1. Slightly more than that of a wooden sleeper
2. Slightly less than that of a wooden sleeper
3. Equal to that of a wooden sleeper
4. None of these

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258. Track construction involves preparation of

1. Sub-grade
2. Plate laying
3. Ballasting
4. All the above

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259. Two important constituents in the composition of steel used for rail are

1. Carbon and silicon
2. Manganese and phosphorous
3. Carbon and manganese
4. Carbon and sulphur

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260. Type of switch rails generally adopted for modern track, is

1. Straight switch
2. Curved switch
3. Loose heel switch
4. Bent switch

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