TGPSC HMWSSB Manager 2015 Paper 2 · Question 34

Question 34 of the TSPSC Manager (Engineering), HMWSSB, 2015: Paper 2 (Civil Engineering) (1 November 2015). Try it first, then open the answer and explanation.

1. Manager 2015 Paper 2 (Civil) · Q34 · Geotechnical Engineering · Soil Mechanics

   In a Laboratory, to perform IS Heavy Compaction Test, it was required to use a mould of 1400 cc capacity in place of standard 1000 cc capacity mould. All other parameters remaining same, the number of blows to be applied per layer to ensure the designated compaction energy is:

   1. 56
   2. 25
   3. 35
   4. 50
   Show answer

   Answer: (3) 35

   The standard 1000 cc mould receives 25 blows per layer, and to keep the same compaction energy per unit volume the number of blows must increase in proportion to the mould volume. Blows = 25 × 1400/1000 = 35.

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