Question 1
Bleeding may be avoided by __________
A. Water voids
B. Air voids
C. Porosity
D. Water content
View Answer
Answer: Option B
Explanation:
The bleeding may be avoided by providing sufficient air voids in the mix, as it is due to leakage of the water from the mix, if air voids are provided then first air escapes and then the water.
Question 2
Marshall stability determines __________
A. Ductility
B. Flexibility
C. Utility
D. Grade of bitumen
View Answer
Answer: Option B
Explanation:
Marshall’s method is used to determine the flexibility of the given grade of bitumen.
Question 3
Maximum size of aggregate in base course is?
A. 25 mm
B. 50 mm
C. 40 mm
D. 30 mm
View Answer
Answer: Option B
Explanation:
The maximum size of aggregate in base course is 50mm, but 20 mm, 30 mm and 40 mm are also used extensively.
Question 4
Maximum size of aggregate in surface course is?
A. 18.5mm
B. 19.5mm
C. 20.5mm
D. 21.5mm
View Answer
Answer: Option A
Explanation:
The maximum size in surface course of pavement is 18.5mm, as we move downward the size of the aggregate increases.
Question 5
Rutting may be avoided by __________
A. Good compaction
B. Good aggregate
C. Good filler
D. Good workmanship
View Answer
Answer: Option B
Explanation:
The rutting is a problem caused in summer which can be avoided by using good aggregate, good filler and good compaction may not be enough, but good aggregate with good workmanship will be sufficient to avoid rutting.
Question 6
The filler material should pass from __________
A. 0.075mm
B. 0.75mm
C. 7.5mm
D. 75mm
View Answer
Answer: Option A
Explanation:
The filler material should have 85 to 100 percent passing from 0.075mm sieve, then only it can be used in highway and express way.
Question 7
The DBM is used in __________
A. Local streets
B. Rural roads
C. Highway
D. Concrete bridges
View Answer
Answer: Option C
Explanation:
The DBM is a high quality bitumen mix used in highways and expressways, but they should fulfill some requirements to be used.
Question 8
The number of blows in Marshalls test specimen is?
A. 25
B. 30
C. 55
D. 75
View Answer
Answer: Option D
Explanation:
The number of blows to be given in Marshalls test specimen is 75 with a height drop of 457mm.
Question 9
The specific gravity of bitumen lies between __________
A. 0.8 & 0.9
B. 0.95 & 0.97
C. 0.97 & 1.02
D. 1.02 & 1.05
View Answer
Answer: Option C
Explanation:
The specific gravity of bitumen is between 0.97&1.02 which depends on the grade of bitumen.
Question 10
The specified method for bitumen mix in India is?
A. Hveem
B. Marshalls method
C. Hubbard method
D. Super paver mix method
View Answer
Answer: Option B
Explanation:
Marshall’s method has been specified by IRC and MORTH for bitumen mix design in India.
Question 11
The surface of bitumen should be __________
A. Smooth
B. Rough
C. Sufficient enough to resist friction
D. Very smooth
View Answer
Answer: Option C
Explanation:
The surface of bitumen should neither be smooth nor rough, it should have adequate frictional resistance.
Question 12
The temperature in Marshall’s method is __________
A. 25
B. 30
C. 35
D. 60
View Answer
Answer: Option D
Explanation:
The temperature in Marshall’s design is taken as 60 for bitumen mix design purposes.
Question 13
Volume of mineral aggregate is?
A. VV+VB
B. Vv-Vb
C. VV*Vb
D. VV/VB
View Answer
Answer: Option A
Explanation:
The volume of aggregate is expressed as the sum of volume of voids and volume of bitumen.
Question 14
Which aggregate produce higher stability of mix?
A. Gravel
B. Sharp sand
C. Rounded sand
D. Fly ash
View Answer
Answer: Option B
Explanation:
Sharp sand and crushed aggregate produce higher stable mix than gravel and round sand.
Question 15
Which layer of pavement should withstand stress?
A. Surface
B. Sub grade
C. Sub base
D. Base
View Answer
Answer: Option A
Explanation:
The stresses and wheel load are to be transferred from pavement surface course to the soil sub grade, automatically the remaining three layers with stand the stress.