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Concrete Technology - Section 1 (5)

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Concrete Technology - Section 1

This section is full with the important questions related to this field
and you can give test if you want to enhance the aptitude ability.

33. 

The maximum amount of dust which may be permitted in aggregates is

A. 5% of the total aggregates for low workability with a coarse grading
B. 10% of the total aggregates for low workability with a fine grading
C. 20% of the total aggregates for a mix having high workability with fine grading
D. all the above.

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

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34. 

The standard sand now a days used in India, is obtained from

A. Jaipur (Rajasthan)
B. Jullundur (Punjab)
C. Hyderabad (Andhra Pradesh)
D. Ennore (Madras)
E. Cuttuck (Orissa).

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

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35. 

Permissible compressive strength of M 300 concrete grade is

A. 100 kg/cm2
B. 150 kg/cm2
C. 200 kg/cm2
D. 250 kg/cm2
E. 300 kg/cm2

Answer: Option E

Explanation:

No answer description available for this question. Let us discuss.

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36. 

To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between

A. 1100° and 1200°C
B. 1200° and 1300°C
C. 1300° and 1400°C
D. 1400° and 1500°C
E. 1500° and 1600°C

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

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37. 

Hydration of cement is due to chemical action of water with

A. Tricalcium silicate and dicalcium silicate
B. Dicalcium silicate and tricalcium aluminate
C. Tricalcium aluminate and tricalcium alumino ferrite
D. All the above.

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

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38. 

After casting, an ordinary cement concrete on drying

A. expands
B. mix
C. shrinks
D. none of these.

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

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39. 

The risk of segregation is more for

A. wetter mix
B. larger proportion of maximum size aggregate
C. coarser grading
D. all the above.

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

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40. 

The mixture of different ingredients of cement, is burnt at

A. 1000°C
B. 1200°C
C. 1400°C
D. 1600°C
E. 1800°C

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

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