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Concrete Technology
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Question
If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer of 150 litre capacity, is
Options
A. 15, 900 litres
B. 16, 900 litres
C. 17, 900 litres
D. 18, 900 litres
Correct Answer
18, 900 litres
Concrete Technology problems
Search Results
1. The bulk density of aggregates, is generally expressed as
Options
A. tonnes/cubic metre
B. kg/cubic metre
C. kg/litre
D. g/cm
3
E. none of these.
Show Answer
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Discuss
Correct Answer: kg/litre
2. Slump test of concrete is a meausre ofits
Options
A. consistency
B. compressive strength
C. tensile strength
D. impact value.
Show Answer
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Discuss
Correct Answer: consistency
3. The grade of concrete M 150 means that compressive strength of a 15 cm cube after 28 days, is
Options
A. 100 kg/cm
2
B. 150 kg/cm
2
C. 200 kg/cm
2
D. 250 kg/cm
2
E. 300 kg/cm
2
Show Answer
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Discuss
Correct Answer: 150 kg/cm
2
4. The type of aggregates of same nominal size, which contain less voids when compacted, are
Options
A. rounded spherical
B. irregular
C. flaky
D. none of these.
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Correct Answer: rounded spherical
5. High temperature
Options
A. increases the strength of concrete
B. decreases the strength of concrete
C. has no effect on the strength of concrete
D. none of these.
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Correct Answer: decreases the strength of concrete
6. Joints in concrete structures, are provided
Options
A. to reduce the tensile stresses likely to be developed due to evaporation of water
B. to minimise the change in the dimensions of the slab
C. to minimise the necessary cracking
D. all the above.
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Correct Answer: all the above.
7. The process of mixing, transporting, placing and compacting concrete using Ordinary Port land Cement should not take more than
Options
A. 30 minutes
B. 40 minutes
C. 60 minutes
D. 75 minutes
E. 90 minutes.
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Correct Answer: 30 minutes
8. If the average compressive strength is 4000 kg/cm
2
and standard deviation is 500, the co-efficient of variation is
Options
A. 10%
B. 12.5%
C. 15%
D. 18.5 %
E. 20%
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Correct Answer: 12.5%
9. Ordinary Portland cement is manufactured from
Options
A. lime stone and clay
B. gypsum and lime
C. pozzolana
D. lime, pozzolana and clay.
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Correct Answer: gypsum and lime
10. Pick up the incorrect statement from the following:
Options
A. Tricalcium silicate (C
3
S) hydrates rapidly
B. Tricalcium silicate (C
3
S) generates more heat of hydration
C. Tricalcium silicate (C
3
S) develops early strength
D. Tricalcium silicate (C
3
S) has more resistance to sulphate attack
E. None of these.
Show Answer
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Correct Answer: Tricalcium silicate (C
3
S) has more resistance to sulphate attack
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