Civil Engineering - Concrete Technology

11. 

After casting, an ordinary cement concrete on drying

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

Answer: Option C

Explanation:

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12. 

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:

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13. 

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:

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14. 

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:

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15. 

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:

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