31. Bitumen is derived from ____.

A.  destructive distillation of petroleum

B.  fractional distillation of petroleum

C.  destructive distillation of coal tar

D.  naturally occurring ores



Answer: B        fractional distillation of petroleum



32. The result of ring and ball softening point test on asphalts is given in terms of ___.

A.  time

B.  temperature

C.  flow 

D.  viscosity



Answer: B         temperature       



33. Bituminous materials are used in highway construction primarily because of their ____.

A.  black colour which facilitates road markings

B.  load bearing capacity

C.  high specific gravity

D.  cementing and waterproofing properties



Answer: D     cementing and waterproofing properties

Bituminous material are very commonly used in highway construction because of their binding/cementing and their water proofing properties. Bitumen is a complex organic material and occurs either naturally or may be obtained artificially during the distillation of petroleum.

Asphalt is found as deposit in the form of natural asphalt or rock asphalt. When the bitumen contains some inert material or minerals, it is sometimes called asphalt.



34. List-l contains some properties of bitumen. List-II gives a list of Laboratory Tests conducted on bitumen to determine the properties. Match the property with the corresponding test and select the correct answer using the codes given below the lists:

List – I

List – II

A. Resistance to flow

1. Ductility test

B. Ability to deform under load

2. Penetration test

C. Safety

3. Flash and fire point test


A.  A-2, B-3, C-1

B.  A-1, B-2, C-3

C.  A-2, B-1, C-3

D.  A-3, B-1, C-2



Answer: C     A-2, B-1, C-3



35. The penetration test for bitumen is conducted at a temperature of ____.

A.  37°C

B.  50°C

C.  25°C

D.  60°C



Answer: C       25°C

The penetration test determines the hardness or softness of bitumen by measuring the depths in tenths of a mm to which a standard loaded needle will penetrate vertically in five seconds and the sample is maintained at a temperature of 25°C.




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