SSC JE Civil Engineering 2018 Set 1 Solved Paper

Question : 132 of 200

Marks: +1, -0

The coefficient of gradation and the coefficient of uniformity of a given soil sample is 1.0 and 4.0 respectively. The ratio of effective size to the diameter through which 30% of the total mass is passed is ______.

1.25
1.5
1.75
2

Validate

Solution:

C_c = 1.0

C_u = 4.0

D_30/D_10=?

C_c= D^2 _30/{D_60×D_10}

C_u=D_60/D_10⇒4.0

4 D_10 = D_60

1.0 =C_c=D^2_30/{4D^2_10

4=(D_30/D_10)^2

[D_30/D_10=2]

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