If radius of horizontal curve is 80 mts, design speed is 40kmph and design co-efficient of lateral friction is 0.15,then rate of super elevation of full lateral friction is will be __________ .
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Solution
A portion of wastewater sample was subjected to standard BOD test(5 days, 20°C), yielding a value of 180 mg/l. The reaction rate constant (to the base ‘e’) at 20°C was taken as 0.18 per day. The reaction rate constant at other temperature may be estimated by kT = k20(1.047)T-20. The temperature at which the other portion of the sampel should be tested,to exert the same BOD in 2.5 days, is __________ .
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Solution
An agricultural land of 437 ha is to be irrigated for a particular crop. The base period fo the crop is 90 days and the total depth of water required by the crop is 105 cm. IF a rainfall of 15 cm occurs during the base period, the duty of irrigation water is
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Solution
Two straight lines deviate at an angle of 60 degrees. The radius of curve joining the two straight lines is 600 m. The length of long chord and mid ordinates in meters of curve are
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Solution
Length of long chord = 2R sin (θ/2)
R = 600 m
θ= 60°
∴Length of long chord = 2 × 600 × sin (60/2)
Mid ordinate =R (1 –cos (θ/2))
= 600[1 – cos (60/2)]
= 80.4 m
The magnetic bearing of a line AB was N 59°30′ W, when the declination was 4°10’E. It present declination is 3°W.The W&E of line is
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Solution
Magnetic bearing N 59° 30'W
Previous declination = 4°10'E
Present declination = 3°W
Present quadrantal bearing
= 59°30'– 4°10¢– 3°
= N52°20'W
∴Present whole circle bearing (WCB)
= 307°40'
Total kjedahl nitrogen is a measure of
A stable channel is to be designed for a discharge of Qm3/s with silt factor f as per Lacey’s method. The mean flow velocity (m/s) in the channel is obtained by
The effective stress friction angle of a saturated cohesion soil is 27°. The ratio of shear stress to normal stress on failure plane is __________.
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Solution
The flow of a liquid (kinematic viscosity = 2.6 × 10–4 m2/s)in an open channel is to be modelled in a laboratory flume using water (v = 10–6 m2/s) as the flowing fluid. If both gravity and viscosity are important, what should be the length scale for maintaining dynamic similarity?
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Solution
A pipe carrying water is attached to a differential manometer. The deflection of mercury is 0.5 m, then (PA –PB) is ____________ m of water.
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Solution