Concrete Technology Sheet 14
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1) Question.
The effective span of a deep beam is taken as
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2) Question.
A beam whose effective span is l, effective depth is 'd' and overall depth is 'D', shall be deemed to be a deep beam when the ratio of
i) l/D is less than 2.0 for a simply supported beam
ii) l/D is less than 2.0 for a continuous beam
iii) l/d is less than 2.5 for a simply supported beam
iv) l/D is less than 2.5 for a continuous beam
Of these statements
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3) Question.
Flexural shear failure in a reinforced concrete beam
i) occurs under large bending moment and less shear force
ii) results in cracks which are normally at 90° with the horizontal
iii) occurs when shear span to effective depth ratio is less than 1
Of these statements
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4) Question.
According to IS: 456-1978, the total chloride content as percentage of mass of cement in concrete mix should be limited to
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5) Question.
According to IS : 456-1978, the total sulphate content as percentage of mass of cement in concrete mix should be limited to
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6) Question.
The water used for ordinary concrete is equal to 5% by weight of aggregate plus..... by weight of cement.
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7) Question.
The controlled concrete is used for -
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8) Question.
The ordinary concrete is not used for ....... grade of concrete mix.
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9) Question.
The concrete in which no preliminary tests are performed for designing the mix is called -
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10) Question.
The minimum quantity of cement to be used in controlled concrete is specified as -
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11) Question.
The maximum quantity of aggregate per 50 kg of cement should not exceed -
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12) Question.
The concrete in which preliminary tests are performed for designing the mix is called -
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13) Question.
If 30% excess water is added, the strength of concrete is reduced by -
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14) Question.
If the proportions of different ingredients (cement, sand and aggregate) are in the ratio of 1:2:4, then the grade of concrete is -
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15) Question.
The correct proportioning of various ingredients of concrete largely depends upon -
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16) Question.
For highly loaded columns, the concrete mix used is of proportion -
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17) Question.
In performing the works test -
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18) Question.
For mass concrete in piers and abutments, the grade of concrete mix used, is -
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19) Question.
The preliminary test should be repeated if the difference of compressive strength of three test specimens exceeds -
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20) Question.
In preliminary test, the concrete is placed in the mould in ...... layers of equal volume
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