Consider the following statements about concrete sleepers_________________?

Railway Engineering 23/11/2020

1. They improve the track modulus.
2. They have good scrap value.
3. They render transportation easy.
4. They maintain the gauge quite satisfactorily.Of these statements

A. 1 and 2 are correct
B. 2 and 3 are correct
C. 3 and 4 are correct
D. 1 and 4 are correct

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    Number of dog spikes normally used per rail seat on curved track is__________________?
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    Metal sleepers are superior to wooden sleepers with respect to________________?
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    If a is the angle of crossing, then the number of crossings ‘N’ according to right angle method is given by_________________?
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    The standard length of rail for Broad Gauge and Meter Gauge are respectively __________________?
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