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
Options
A. 11
B. 9
C. 7
D. 5
Correct Answer
9
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1. Generally the maximum deflection/span ratio of a steel member should not exceed
2. In a river, discharge is 173 m3/s; water surface slope is 1 in 6000; and stage at the gauge station is 10.0 m. If during a flood, the stage at the gauge station is same and the water surface slope is 1 in 2000, the flood discharge in m3/s, is approximately
Correct Answer: transmissibility of aquifer and specific yield of aquifer
5. 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
7. A stable channel is to be designed for a discharge of Q m3 /s with silt factor f as per Lacey's method. The mean flow velocity (m/s) in the channel is obtained by
Correct Answer: concentration of biodegradable organic matter
9. While deriving an expression for loss of head due to a sudden expansion in a pipe, in addition to the continuity and impulse-momentum equations, one of the following assumptions is made :
Options
A. Head loss due to friction is equal to the head loss in eddying motion
B. The mean pressure in eddying fluid is equal to the downstream pressure
C. The mean pressure in eddying fluid is equal to the upstream pressure
Correct Answer: The mean pressure in eddying fluid is equal to the upstream pressure
10. A light house of 120 m height is just visible above the horizon from a ship. The correct distance (m) between the ship and the light house considering combined correction for curvature and refraction, is
