Concrete Technology Sheet 17
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1) Question.
Percentage of steel for balanced design of a singly reinforced rectangular section by limit state method depends on
i) characteristic strength of concrete
ii) yield strength of steel
iii) modulus of elasticity of steel
iv) geometry of the section
The correct answer is
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2) Question.
For a given water-cement ratio in concrete, with passage of time, the permeability
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3) Question.
According to IS : 456-1978, minimum period stipulated for moist curing of concrete using ordinary portland cement is
Answer. -
4) Question.
Assertion A: Retarders are useful when concreting is done in hot water.
Reason R: In hot weather normal setting time of concrete is reduced due to higher temperature.
Select your answer based on the coding system given below.
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5) Question.
Calcium chloride as accelerating admixture is not recommended for use with
i) ordinary portland cement
ii) rapid hardening cement
iii) high alumina cement
The correct answer is
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6) Question.
The standard sand now used in India is obtained from -
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7) Question.
If sea water is used for preparing concrete mix, it -
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8) Question.
The admixtures are added in concrete to -
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9) Question.
The presence of ..... in water has an adverse effect on the setting time of cement. -
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10) Question.
If the fineness modulus of sand is 3, then the sand is graded as -
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11) Question.
The value of fineness modulus for fine sand may range between -
Answer. -
12) Question.
The fineness modulus of an aggregate is roughly proportional to -
Answer. -
13) Question.
The ratio of the volume of moist sand to the volume of dry sand is known as -
Answer. -
14) Question.
When the sand is fuly saturated, its volume is ...... the volume of dry and loose sand
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15) Question.
With the moisture content of 5 to 10% by weight, the bulking of sand is increased by -
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16) Question.
Bulking of sand is -
Answer. -
17) Question.
The resistance of an aggregate to the effect of hydration of cement and weather is called -
Answer. -
18) Question.
The resistance of an aggregate to wear is known as -
Answer. -
19) Question.
The resistance of an aggregate to compressive forces is known as -
Answer. -
20) Question.
The deleterious materials present in the aggregate -
Answer.
