Civil Engineering - Concrete Technology

36. 

Pick up the incorrect statement from the following:

A. Tricalcium silicate (C3S) hydrates rapidly
B. Tricalcium silicate (C3S) generates more heat of hydration
C. Tricalcium silicate (C3S) develops early strength
D. Tricalcium silicate (C3S) has more resistance to sulphate attack
E. None of these.

Answer: Option D

Explanation:

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37. 

Permissible compressive strength of M 200 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 C

Explanation:

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38. 

In slump test, each layer of concrete is compacted by a steel rod 60 cm long and of 16 mm diameter for

A. 20 times
B. 25 times
C. 30 times
D. 40 times
E. 50 times

Answer: Option B

Explanation:

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39. 

If the average compressive strength is 4000 kg/cm2 and standard deviation is 500, the co-efficient of variation is

A. 10%
B. 12.5%
C. 15%
D. 18.5 %
E. 20%

Answer: Option B

Explanation:

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40. 

For preparing ordinary concrete, the quantity of water used, is

A. 5% by weight of aggregates plus 20% of weight of cement
B. 10% by weight of aggregates plus 10% of weight of cement
C. 5% by weight of aggregates plus 30% of weight of cement
D. 30% by weight of aggregates plus 10% of weight of cement
E. none of these.

Answer: Option C

Explanation:

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