Concrete Technology Sheet 19
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1) Question.
Assertion A: The load factor for live load is greater than that for dead load.
Reason R: The live loads are more uncertain than dead loads.
Select your answer based on the coding system given below :
Answer. -
2) Question.
The main reinforcement in the toe of a T-shaped R.C. retaining wall is provided on
i) top face parallel to the wall
ii) top face perpendicular to the wall
iii) bottom face parallel to the wall
iv) bottom face perpendicular to the wall
The correct answer is
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3) Question.
Examine the following statements :
i) Factor of safety for steel should be based on its yield stress.
ii) Factor of safety for steel should be based on its ultimate stress.
iii) Factor of safety for concrete should be based on its yield stress.
iv) Factor of safety for concrete should be based on its ultimate stress.
The correct statements are
Answer. -
4) Question.
The effect of adding calcium chloride in concrete is
i) to increase shrinkage
ii) to decrease shrinkage
iii) to increase setting time
iv) to decrease setting time
The correct answer is
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5) Question.
The aggregate which pass through 75 mm US sieve and entirely retain on 4.75 mm IS sieve is known as -
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6) Question.
An aggregate is said to be......aggregate if its size is more than 75mm
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7) Question.
The material having particle size varying from 0.002 to 0.06 mm is termed as -
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8) Question.
For the manufacture of concrete of low density, he aggregate used is -
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9) Question.
For reinforced concrete, the aggregate used is -
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10) Question.
According to IS:383-1970, a good aggregate for concrete construction should be -
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11) Question.
The inert mineral material used for the manufacture of mortars and concretes is -
Answer. -
12) Question.
During field test, the cement is said to be pure and of good quality when -
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13) Question.
The cubes of cement prepared for compressive strength test should be kept at a temperature of ...... in an atmosphere of at least 90% relative humidity for 24 hours. -
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14) Question.
According to Indian standard specifications for the compressive strength test of cement, the cement and standard sand mortar in the ratio of ...... is used. -
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15) Question.
Initial setting time of ordinary Portland cement is -
Answer. -
16) Question.
To perform the compressive strength test of cement, water is added at the rate of -
[P= Percentage of water required for normal consistency paste]
Answer. -
17) Question.
Le-chatelier apparatus is used to perform -
Answer. -
18) Question.
To perform the initial setting time test, the water is added to the cement at the rate of ...... by weight of cement -
[P= Percentage of water required for normal consistency paste]
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19) Question.
The percentage of water for making a cement paste of normal consistency varies from -
Answer. -
20) Question.
The length of Vicat plunger in Vicat's apparatus varies from -
Answer.
