Civil Engineering - GATE Exam Questions

11. 

A pre-tensioned concrete member of section 200 mm x 250 mm contains tendons of area 500 mm2 at centre of gravity of the section. The prestress in the tendons is 1000 N/mm2. Assuming modular ratio as 10, the stress (N/mm2) in concrete is

A. 11
B. 9
C. 7
D. 5

Answer: Option B

Explanation:

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12. 

A river 5 m deep consists of a sand bed with saturated unit weight of 20 kN/m3 . vw = 9.81 kN/m3. The effective vertical stress at 5 m from the top of sand bed is

A. 41 kN/m2
B. 51 kN/m2
C. 55 kN/m2
D. 53 kN/m2

Answer: Option B

Explanation:

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13. 

Biochemical oxygen demand (BOD) of waste water is a measure of

A. total concentration of a biochemicals
B. total concentration of organic matter
C. concentration of biodegradable organic matter
D. concentration of chemically oxidisable matter

Answer: Option C

Explanation:

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14. 

The effective width of a reinforced concrete T beam flange under compression, according to IS : 456-1978, given I0 is the distance between the adjacent zero moment points, b is the breadth of the rib and D is the thickness of the flange, is

A.
B. I0 + 6D
C.
D.

Answer: Option A

Explanation:

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15. 

In using the data from a plate bearing test for determining the modulus of subgrade reaction, the value of settlement to be used is :

A. 1.25 mm
B. 2.50 mm
C. 3.75 mm
D. 1.75 mm

Answer: Option A

Explanation:

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