Civil Engineering - Building Materials

41. 

Upto a maximum of 72% of iron, is available in

A. Magnetite
B. Red haemetite
C. Limonite
D. Siderite
E. Iron pyrites.

Answer: Option A

Explanation:

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42. 

For lime concrete,

A. slump is 50 to 75 mm
B. flexural strength at 90 days is 0.2 N/mm2
C. compressive strength at 90 days is 1.5 N/mm2
D. compressive strength at 26 days is 1.2 N/mm2
E. all the above.

Answer: Option E

Explanation:

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43. 

Pig iron made from heamatite ores free from sulphur, phosphorus and copper, is known as

A. Bessemer pig
B. Grey or foundry pig
C. White or forge pig
D. Mottled pig
E. All the above.

Answer: Option A

Explanation:

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44. 

Pick up the correct statement from the following:

A. Blistering may be cured by applying water paint finished with oil paint dried with a little copal varnish
B. Cracked paints may be cured by removing paint and giving a fresh coat of paint
C. Crawling paints may be cured by sand preparing the surface and giving a fresh coat with plenty of turps
D. All the above.

Answer: Option D

Explanation:

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45. 

The material generally not used as extender in paints, is

A. powdered silica
B. gypsum
C. talc
D. zinc white.

Answer: Option D

Explanation:

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