Civil Engineering - Concrete Technology

31. 

The dimensions of a 35 litre forma for measuring aggregates by volume, are :

A. length 30 cm, breadth 25 cm, height 30 cm
B. length 39 cm, breadth 25 cm, height 32 cm
C. length 27 cm, breadth 27 cm, height 48 cm
D. length 220 cm, breadth 25 cm, height 40 cm
E. none of these.

Answer: Option C

Explanation:

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32. 

The shuttering of a hall measuring 4 m x 5 m, can be removed after

A. 5 days
B. 7 days
C. 10 days
D. 14 days
E. 21 days

Answer: Option B

Explanation:

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33. 

Pick up the correct statement from the following:

A. There should not be any loss of cement from the charged drum of the mixer
B. Cement should be mixed for at least one minute
C. 10% of water is placed in the rotating drum before adding dry material
D. 10% of water is added after placing the other ingredients in the drum
E. All the above.

Answer: Option E

Explanation:

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34. 

If 50 kg of fine aggregates and 100 kg of coarse agregates are mixed in a concrete whose water cement ratio is 0.6, the weight of water required for harsh mix, is

A. 8 kg
B. 10 kg
C. 12 kg
D. 14 kg
E. 15 kg.

Answer: Option C

Explanation:

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35. 

The entrained air in concrete

A. increases workability
B. decreases workability
C. decreases resistance to weathering
D. increases strength
E. neither affects workability nor strength.

Answer: Option A

Explanation:

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