If the laod, warping and frictional stresses in a cement concrete slab are 210 N/mm2, 290 N/mm2 and 10 N/mm2 respectively, the critical combination of stresses during summer midday is ____________ × 105kN/m2.
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Solution
Critical combination = 210 + 290 – 10
= 490 N/mm2= 4.9× 105kN/m2
Match List I (Elements of aerial photographs) with List II(Explanation of the elements)
List I List II
A.Perspective centre photograph. 1.The point where the perpendicular from the optical centre of the lens meets the
B.Plumb point 2.The point where the bisect or of the angle between the vertical and perpendicular from optical centre meet the photograph.
C.Principal point 3.The point where the vertical through the optical centre meets the photograph.
D.Is ocentre 4.The point where the rays from the object converge.
A stationary liquid is so stratified that its density is do (1 + h)at a depth h below the free surface. At a depth h in this liquid the pressure p in excess of δogh is
Select the incorrect statement
A thin cylindrical tube with closed ends is subjected to
1. Longitudnal stress σ1 = 14 N/mm2
2.Hoop stress σ2 = 2 N/mm2
3.Shearing stress τ= 8 N/mm2
Then the maximum shearing stress is
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Solution
As per the Mohr's circle
The minimum thickness of rectangular slab base is calculated from
Where, fy= yield stress of steel
w = the uniform pressure from below the base.
M = moment
a, b = cantilever portions of slab base.
For sand of uniform spherical particles, the ratio of void ratio’s in the loosest and the densest state is
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Solution
An aggregate is known as cyclopean aggregate if its size is more than
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Solution
Cylopean aggregate size > 75 mm
A prismatic bar of uniform cross-sectional area of 5 cm2 is subjected to axial loads as shown in the given figure.
Portion BC is subjected to an axial tensile stress of ______kg/cm2
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Solution
A pump discharges 500 lit/sec at a head of 25m. The drive motor delivers 200KW of power to the pump. At what efficiency the pump is operating ?
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Solution