Description : The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is (A) 0.5 (B) 1 (C) 1.5 (D) 2
Last Answer : (D) 2
Description : In open channel flow in a rectangular channel, the ratio between the critical depth and the initial depth, when a hydraulic jump occurs is (A) 0.5 (B) 0.84 (C) 1.84 (D) 1.25
Last Answer : (C) 1.84
Description : The most economical section of a rectangular channel is one which has hydraulic mean depth or hydraulic radius equal to (A) Half the depth (B) Half the breadth (C) Twice the depth (D) Twice the breadth
Last Answer : Answer: Option A
Description : The ratio of the hydraulic radius to the diameter of the channel, for maximum mean velocity of flow in a circular channel, in open channel flow is (A) 0.3 (B) 0.9 (C) 0.03 (D) 0.66
Last Answer : (A) 0.3
Description : The losses in open channel flow generally vary as the (A) Inverse of the roughness (B) First power of the roughness (C) Square of the velocity (D) Inverse square of hydraulic radius
Last Answer : (B) First power of the roughness
Description : According to Chezy's formula, the discharge through an open channel is (where A = Area of flow, C = Chezy's constant, m = Hydraulic mean depth, and i = Uniform slope in bed) (A) A × m × i) (B) C × m × i) (C) AC × m × i) (D) mi × A × C)
Last Answer : Answer: Option C
Description : The critical depth meter is used to measure (A) Velocity of flow in an open channel (B) Depth of flow in an open channel (C) Hydraulic jump (D) Depth of channel
Description : The ratio of width to depth for the most economical rectangular section in open channel flow is (A) 0.5 (B) 1 (C) 1.5 (D) 2
Description : Hydraulic mean depth (Dm) for a circular pipe of diameter 'D' flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum (A) Flow rate (B) Mean velocity (C) Both 'a' & 'b' (D) Neither 'a' nor 'b
Last Answer : (B) Mean velocity
Description : Pick up the incorrect statement from the following: (A) The rate of flow of water through a unit cross-sectional area under a unit hydraulic gradient, is called coefficient of permeability (B) ... aquifers, is governed by the Darcy's law (D) The term 'transmissibility' was introduced by Meinzer
Last Answer : Answer: Option D
Description : The hydraulic mean depth or the hydraulic radius is the ratio of (A) Area of flow and wetted perimeter (B) Wetted perimeter and diameter of pipe (C) Velocity of flow and area of flow (D) None of these
Description : The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to (A) 1/2 × depth (B) 1/2 × breadth (C) 1/2 × sloping side (D) 1/4 × (depth + breadth)
Description : For hydraulically efficient rectangular channel of bed width 4.0 m, the depth of flow is (a) 4 m (b) 0.5 m (c) 1 m (d) 2 m
Last Answer : (d) 2 m
Description : The discharge through a channel of trapezoidal section is maximum when (A) Width of channel at the top is equal to twice the width at the bottom (B) Depth of channel is equal to the width at the bottom ... equal to half the width at the top (D) The sloping side is equal to the width at the bottom
Description : Normal depth in open channel flow is the depth of flow in the channel (A) Corresponding to uniform flow (B) Measured normal to the channel bed (C) Corresponding to steady flow (D) None of these
Last Answer : (A) Corresponding to uniform flow
Description : The ratio of the depth of flow to the diameter of the channel for maximum discharge in a circular channel in open channel flow is (A) 0.1 (B) 0.55 (C) 0.95 (D) 1.85
Last Answer : (C) 0.95
Description : Define hydraulic radius for trapezoidal channel.
Last Answer : Hydraulic Radius: It is the ratio of the wetted area to wetted perimeter. It is also called as Hydraulic mean depth. R= Wetted area / Wetted perimeter = A/P
Description : The equivalent diameter for fluid flow through square cross section channel of side 'x', for pressure drop calculation purpose is given by (A) 4x (B) 2x (C) x (D) √x
Last Answer : (C) x
Description : Hydraulic radius is the ratio of (A) Wetted perimeter to flow area (B) Flow area to wetted perimeter (C) Flow area to square of wetted perimeter (D) Square root of flow area to wetted perimeter
Last Answer : (B) Flow area to wetted perimeter
Description : 12. The flow at critical depth in an open channel is called torrential flow. A) Yes B) No
Last Answer : B
Description : If the depth of water in an open channel is greater than the critical depth, the flow is called (A) Critical flow (B) Turbulent flow (C) Tranquil flow (D) Torrential flow
Description : Normal depth in open channel flow is the depth of flow corresponding to (A) Steady flow (B) Unsteady flow (C) Laminar flow (D) Uniform flow
Description : If the depth of water in an open channel is less than the critical depth, the flow is called (A) Critical flow (B) Turbulent flow (C) Tranquil flow (D) Torrential flow
Description : The critical depth in a channel can be produced (A) By raising the bottom of the channel (B) By lowering the bottom of the channel (C) By decreasing the width of the channel (D) Both (a) and (c) of above
Description : Assertion A: Depth and width required at the entrance to a harbour are more than those required in the channel. Reason R: The entrance to a harbour is usually more exposed to waves as compared to the harbour itself. ... explanation of A (C) A is true but R is false (D) A is false but R is true
Last Answer : (A) Both A and R is true and R is the correct explanation of A
Description : With respect to a channel of distribution, the number of intermediary levels within the channel indicates the ____________ of a channel. A. width B. depth C. length D. similarity
Last Answer : C. length
Description : In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is A. D B. D /2 C. D/3 D. D/4
Last Answer : ANS: D
Description : A hydraulic jump in a control meter will be formed above the control, if its original (A) Depth is more than critical depth (B) Depth is less than the critical depth (C) Depth is equal to critical depth (D) None of these
Last Answer : Answer: Option B
Description : The location of centre of pressure, which defines the point of application of the total pressure force on the surface, can be calculated by applying the principle of moments according to which "sum of the moment of the resultant force about an ... liquid) (A) 1/(y/3) (B) 2y/3 (C) 1/(y/4) (D) 3y/4
Last Answer : (B) 2y/3
Description : The maximum discharge through a circular channel takes place, when the depth of the fluid flow is __________ times the pipe diameter. (A) 0.25 (B) 0.5 (C) 0.66 (D) 0.95
Last Answer : (D) 0.95
Description : The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is A. 100 cm B. 110 cm C. 120 cm D. 150 cm
Last Answer : ANS: C
Description : The dimensions of a rectangular settling tank are: length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is A. 204 cu.m B. 208 cu.m C. 212 cu.m D. 216 cu.m
Description : If the velocities of flow of a stream of 10 m depth recorded by a current meter at depths of 2 m and 8 m are 0.7 m and 0.3 m respectively, the discharge per unit width of the stream in cubic metres, is (A) 2 (B) 3 (C) 4 (D) 5
Description : Consider the following statements: The time of BOD assimilation in a stream can be affected by 1. Ratio of stream depth to flow width. 2. Stream BOD value 3. BOD rate constant. Which of these statements are correct? (a) 1, 2 & 3 (b) 1 & 2 only (c) 2 & 3 only (d) 1 & 3 only
Last Answer : (a) 1, 2 & 3
Description : Consider the following statements: Mitra's hyperbolic transition design is based on the principle that : 1. Flow depth in the canal, as well as the discharge, is constant 2. width of the canal varies along with the discharge 3. Rate ... a) 1, 2 and 3 b) 1 and 2 only c) 2 and 3 only d) 1 and 3 only
Last Answer : d) 1 and 3 only
Description : weight of water, the hydraulic mean depth of the sewer and the bed slope w is the unit of the sewer, then the tractive force exerted by flowing water, is A. w r S S B. w r1/2 C. w r S D. w r2/3
Last Answer : ANS: A
Description : In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said ... co-efficient for flows at equal Reynold number (D) All (A), (B) & (C)
Last Answer : (C) Friction co-efficient for flows at equal Reynold number
Description : Hydraulic diameter for non-circular ducts is equal to __________ times the area of flow divided by the perimeter. (A) Two (B) Three (C) Four (D) Eight
Last Answer : (C) Four
Description : Which one of the following statements regarding septic tanks is wrong? A. A gap of 7.5 cm between the bottom of the covering slab and the top level of scum is provided B. The outlet invert level is kept ... . The minimum width of septic level is 90 cm D. The depth of tank is kept equal to its width
Description : A foundation is called shallow if its depth, is (A) One-fourth of its width (B) Half of its width (C) Three-fourth of its width (D) Equal to its width
Description : A well is sunk in an unconfined aquifer having a saturated depth of 100 m. Assuming the equilibrium flow conditions and a homogeneous aquifer and radius of influence to be same, the ratio of discharges at 20 m and 40 m draw downs, is (A) 2/3 (B) 5/4 (C) 4/5 (D) 8/7
Description : Hydraulic radius of 6" × 12" cross-section, is __________ inches. (A) 2 (B) 0.5 (C) 1.5 (D) None of these
Last Answer : (A) 2
Description : Which of the following quantities are computed by using the hydraulic radius for non-circular ducts? (A) Velocity and relative roughness (B) Head loss and velocity (C) Reynold number, relative roughness and head loss (D) Reynolds number and friction factor
Last Answer : (C) Reynold number, relative roughness and head loss
Description : With increasing flow rate, the hydraulic efficiency of a centrifugal pump (A) Monotonically decreases (B) Decreases and then increases (C) Remains constant (D) Increases and then decreases
Last Answer : (A) Monotonically decreases
Description : The discharge in an open channel corresponding to critical depth is (A) Zero (B) Minimum (C) Maximum (D) None of these
Description : A structure, whose width is __________ the width of the channel, is called a flumed structure. (A) Less than (B) More than (C) Equal (D) None of these
Description : If D is the depth of scour below original bed, then the width of launching apron is generally taken as (A) 1.2 D (B) 1.5 D (C) 2.0 D (D) 2.5 D
Description : Best side slope for most economical trapezoidal section in open channel flow, wherein side slopes are defined by : X horizontal to 1 vertical, is when X equals : (a) 0.404 (b) 0.500 (c) 0.577 (d) 0.673
Last Answer : (c) 0.577
Description : A circular sewer section is preferred to because A. It is cheaper in construction B. It provides maximum area for a given perimeter C. It provides maximum hydraulic mean depth D. All the above