Building Materials, Third Edition

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2e— RSU

2. Petroleum bitumen is obtained from
   (a) fractional distillation
   (b) extraction
   (c) atmospheric-vaccum distillation
   (d) destructive distillation


3. The grade of wood tar used for grouting purposes is
   (a) RT-1 (b) RT-2 (c) RT-4 (d) RT-5


4. Coal tar pitch is classified on the basis of
   (a) viscosity (b) softening point
   (c) sp.gr (d) ductility


5. Ring and ball apparatus is used for which of the following test of bitumen?
   (a) Penetration (b) Viscosity
   (c) Softening point (d) Ductility


6. The Pensky-Marten test is used for testing
   (a) fire point (b) ductility
   (c) viscosity of bitumen (d) penetration


7. Bureau of Indian Standards classifies bitumen into grades such as 65/25, 85/40 etc. The
   first and second numbers respectively refer to
   (a) softening point and penetration
   (b) penetration and softening point
   (c) flash point and penetration
   (d) flash point and softening point


8. The stripping value of aggregate in bituminous costruction should not be more than
   (a) 10% (b) 15% (c) 20% (d) 25%

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1. (d) 2. (c) 3. (d) 4. (b) 5. (c) 6. (a) 7. (a) 8. (d)