Best Ballast Contains Stones Varying In Size From

Answer: C. 2.0 cm to 5.0 cm

Best ballast contains stones varying in size from 2.0 cm to 5.0 cm.

Solution

Ballast is a hard material substance which is used to transfer the load from wheel to ground. It is placed below or around the sleepers.

• The size of ballast generally depends upon the sleeper characteristics as for flat bottom sleepers 50 mm size of ballast is used and for metal sleepers, 40 mm size of ballast is used.
• Small size ballasts are better for adjustment and compaction and hence in the case of points and crossing generally 25 mm size of ballast is used. As points and crossing are more susceptible to heavy blows of moving load.

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