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Cylindrical compression specimens are cast in standard moulds of what internal diameter and height?
Answer & Solution
Correct answer: D.
1. The standard cylinder mould has an internal diameter of 150 mm.
2. Its height is 300 mm, giving a height-to-diameter ratio of 2.0.
3. The 2:1 ratio limits end-restraint effects on the failure plane.
4. 100 × 200 mm cylinders exist for low-stress research but are not the IS standard.
5. The other diameters and heights are not specified.
_Source: IGNOU ET-522 Concrete Technology, Block 2 Unit 9 "Testing of Concrete"._
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