PYQs of GATE ESE and PSU for SSC JE / RRB JE [Part - 2]

~15 ONE LINERS FOR SSC JE

1. For ordinary portland cement the maximum expansion by Le Chatelier's should not exceed 

Ans - 10 mm

2. Le Chatelier's device - soundness of cement .

3. The role of super plastisizer in cement paste is to disperse the particles .

4. Surkhi added to lime mortar to impart hydraulicity .

5. Increase in fineness of cement increases the rate of strength development and leads to higher shrinkage .

6. Le Chatelier's Flask - specific gravity

    Vicat Appratus - setting time 

    Autoclave - soundness

    Fineness - Blain's Appratus 

7. Low heat cement contains lower percentage of C3A

8. Specific surface for OPC-2250cm2/gm and RHC - 3250cm2/gm.

9. Heat of hydration C3A>C3S>C4AF>C2S

10. RHC has maximum percentage of C3S. 

11. Soundness test of cement is done to determine - free lime content.

12. For construction of structure under water hydraulic lime is used .

13. Normal brick 1:6

       Plastering work 1:4 

       Grouting 1:15 

       Gunting 1:3 

14. The approximate proportion of dry cement mortar required for brick work is  30%

15. High alumina content is achieved by fusing together a mixture of limestone and bauxite .