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) 2The 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

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
by

1 Answer

Answer :

(D) 2
by

Related questions

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

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

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

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

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

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

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

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

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

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

What is most economical channel section ? Write conditions for rectangular channel section to be economical .

Description : What is most economical channel section ? Write conditions for rectangular channel section to be economical . 

Last Answer : Most Economical Channel Section: - A channel which gives max. discharge for a given c/s area & bed slope and coefficient of roughness is called as Most Economical Channel Section. OR The most economical channel ... amount of excavation. Condition for rectangular channel: - i) b = 2d ii) R = d/2

The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be (A) Parabolic (B) Hyperbolic (C) Straight line (D) None of these

Description : The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be (A) Parabolic (B) Hyperbolic (C) Straight line (D) None of these

Last Answer : (A) Parabolic

For economical consideration, the ratio of overall depth to width should be [ A ] less than 1.5 [ B ] between 1.50 and 2.0 [ C ] between 2.0 to 2.5 [ D ] greater than 2.5

Description : For economical consideration, the ratio of overall depth to width should be [ A ] less than 1.5 [ B ] between 1.50 and 2.0 [ C ] between 2.0 to 2.5 [ D ] greater than 2.5

Last Answer : [ B ] between 1.50 and 2.0

For economical consideration, the ratio of overall depth to width should be [ A ] less than 1.5 [ B ] between 1.50 and 2.0 [ C ] between 2.0 to 2.5 [ D ] greater than 2.5

Description : For economical consideration, the ratio of overall depth to width should be [ A ] less than 1.5 [ B ] between 1.50 and 2.0 [ C ] between 2.0 to 2.5 [ D ] greater than 2.5

Last Answer : [ B ] between 1.50 and 2.0

If 'x' is the depth of flow in an open channel of large width, then the hydraulic radius is equal to (A) x (B) x/2 (C) x/3 (D) 2x/3

Description : If 'x' is the depth of flow in an open channel of large width, then the hydraulic radius is equal to (A) x (B) x/2 (C) x/3 (D) 2x/3

Last Answer : (A) x

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 : 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)

Last Answer : Answer: Option A

The moment of inertia of a rectangular section of width and depth about an axis passing through C.G. and parallel to its width is (A) BD²/6 (B) BD3 /6 (C) BD3 /12 (D) B²D/6

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Last Answer : (C) BD3 /12 

The section modulus of a rectangular section is proportional to (A) Area of the section (B) Square of the area of the section (C) Product of the area and depth (D) Product of the area and width

Description : The section modulus of a rectangular section is proportional to  (A) Area of the section  (B) Square of the area of the section  (C) Product of the area and depth  (D) Product of the area and width

Last Answer : (A) Area of the section

A uniformly distributed load of 20 kN/m acts on a simply supported beam of rectangular cross section of width 20 mm and depth 60 mm. What is the maximum bending stress acting on the beam of 5m? a. 5030 Mpa b. 5208 Mpa c. 6600 Mpa d. Insufficient data

Description : A uniformly distributed load of 20 kN/m acts on a simply supported beam of rectangular cross section of width 20 mm and depth 60 mm. What is the maximum bending stress acting on the beam of 5m? a. 5030 Mpa b. 5208 Mpa c. 6600 Mpa d. Insufficient data

Last Answer : b. 5208 Mpa

For a strongest rectangular beam cut from a circular log, the ratio of the width and depth, is (A) 0.303 (B) 0.404 (C) 0.505 (D) 0.707

Description : For a strongest rectangular beam cut from a circular log, the ratio of the width and depth, is  (A) 0.303  (B) 0.404  (C) 0.505  (D) 0.707 

Last Answer : (D) 0.707 

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

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

The discharge through a channel of rectangular section will be maximum, if (A) Its depth is twice the breadth (B) Its breadth is twice the depth (C) Its depth is thrice the breadth (D) Its breadth is thrice the depth

Description : The discharge through a channel of rectangular section will be maximum, if (A) Its depth is twice the breadth (B) Its breadth is twice the depth (C) Its depth is thrice the breadth (D) Its breadth is thrice the depth

Last Answer : Answer: Option B

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 : 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

Last Answer : ANS: D

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 (C) The sloping side is equal to half the width at the top (D) The sloping side is equal to the width at the bottom

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

Last Answer : Answer: Option C

A cantilever beam rectangular in cross-section is subjected to an isolated load at its free end. If the width of the beam is doubled, the deflection of the free end will be changed in the ratio of (A) 8 (B) 1/8 (C) 1/2 (D) 3

Description : A cantilever beam rectangular in cross-section is subjected to an isolated load at its free end. If the  width of the beam is doubled, the deflection of the free end will be changed in the ratio of  (A) 8  (B) 1/8  (C) 1/2  (D) 3

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The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is A. 0.68 m B. 0.88 m C. 1.36 m D. 1.76 m

Description : The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is A. 0.68 m B. 0.88 m C. 1.36 m D. 1.76 m

Last Answer : ANS: C

The effective depth of a singly reinforced rectangular beam is 300mm. the section is over-reinforced and the neutral axis is 120mm below the top. If the maximum stress attained by concrete is 5N/mn2 and the modular ratio is 18, then the stress developed in the steel will (a) 130N/mm2 (b) 135N/mm2 (c) 160N/mm2 (d) 180N/mm2

Description : The effective depth of a singly reinforced rectangular beam is 300mm. the section is over-reinforced and the neutral axis is 120mm below the top. If the maximum stress attained by concrete is 5N/mn2 and the modular ratio ... in the steel will (a) 130N/mm2 (b) 135N/mm2 (c) 160N/mm2 (d) 180N/mm2

Last Answer : (b) 135N/mm2

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

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

If permissible working stresses in steel and concrete are respectively 1400 kg/cm2 and 80 kg/cm2 and modular ratio is 18, in a beam reinforced in tension side and of width 30 cm and having effective depth 46 cm, the lever arms of the section, is (A) 37 cm (B) 38 cm (C) 39 cm (D) 40 cm

Description : If permissible working stresses in steel and concrete are respectively 1400 kg/cm2 and 80 kg/cm2 and modular ratio is 18, in a beam reinforced in tension side and of width 30 cm and having effective depth 46 cm, the lever arms of the section, is (A) 37 cm (B) 38 cm (C) 39 cm (D) 40 cm

Last Answer : Answer: Option D

The deflection of any rectangular beam simply supported, is (A) Directly proportional to its weight (B) Inversely proportional to its width (C) Inversely proportional to the cube of its depth (D) Directly proportional to the cube of its length

Description : The deflection of any rectangular beam simply supported, is (A) Directly proportional to its weight (B) Inversely proportional to its width (C) Inversely proportional to the cube of its depth (D) Directly proportional to the cube of its length

Last Answer : (C) Inversely proportional to the cube of its depth

channel is said to be of most economical cross-section, if (A) It gives maximum discharge for a given cross-sectional area and bed slope (B) It has minimum wetted perimeter (C) It involves lesser excavation for the designed amount of discharge (D) All of the above

Description : channel is said to be of most economical cross-section, if (A) It gives maximum discharge for a given cross-sectional area and bed slope (B) It has minimum wetted perimeter (C) It involves lesser excavation for the designed amount of discharge (D) All of the above

Last Answer : Answer: Option D

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

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

If the permissible stress in steel in tension is 140 N/mm², then the depth of neutral axis for a singly reinforced rectangular balanced section will be (A) 0.35 d (B) 0.40 d (C) 0.45 d (D) Dependent on grade of concrete also

Description : If the permissible stress in steel in tension is 140 N/mm², then the depth of neutral axis for a singly reinforced rectangular balanced section will be (A) 0.35 d (B) 0.40 d (C) 0.45 d (D) Dependent on grade of concrete also

Last Answer : Answer: Option B

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

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

The equivalent diameter for flow through a rectangular duct of width B and height H is (A) HB/2 (H + B) (B) HB/(H + B) (C) 2HB/(H + B) (D) 4HB/(H + B)

Description : The equivalent diameter for flow through a rectangular duct of width B and height H is (A) HB/2 (H + B) (B) HB/(H + B) (C) 2HB/(H + B) (D) 4HB/(H + B)

Last Answer : (C) 2HB/(H + B)

For the same height, the bottom width for no tension, (A) For triangular section is more than rectangular section (B) For rectangular section is more than triangular section (C) For triangular section is same as that of a rectangular section (D) None of these

Description : For the same height, the bottom width for no tension,  (A) For triangular section is more than rectangular section  (B) For rectangular section is more than triangular section  (C) For triangular section is same as that of a rectangular section  (D) None of these 

Last Answer : (C) For triangular section is same as that of a rectangular section 

A rectangular bar of width b and height h is being used as a cantilever. The loading is in a plane parallel to the side b. The section modulus is (A) bh3 /12 (B) bh²/6 (C) b²h/6 (D) None of these

Description : A rectangular bar of width b and height h is being used as a cantilever. The loading is in a plane parallel to the side b. The section modulus is (A) bh3 /12 (B) bh²/6 (C) b²h/6 (D) None of these

Last Answer : (C) b²h/6

An R.C.C. beam of 25 cm width and 50 cm effective depth has a clear span of 6 metres and carries a U.D.L. of 3000 kg/m inclusive of its self weight. If the lever arm constant for the section is 0.865, the maximum intensity of shear stress, is (A) 8.3 kg/cm2 (B) 7.6 kg/cm2 (C) 21.5 kg/cm2 (D) 11.4 kg/cm2

Description : An R.C.C. beam of 25 cm width and 50 cm effective depth has a clear span of 6 metres and carries a U.D.L. of 3000 kg/m inclusive of its self weight. If the lever arm constant for the section is 0.865, the maximum intensity ... , is (A) 8.3 kg/cm2 (B) 7.6 kg/cm2 (C) 21.5 kg/cm2 (D) 11.4 kg/cm2

Last Answer : Answer: Option A

12. The flow at critical depth in an open channel is called torrential flow. A) Yes B) No

Description : 12. The flow at critical depth in an open channel is called torrential flow. A) Yes B) No

Last Answer : B

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)

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

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)

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

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 : 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

Last Answer : Answer: Option C

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 : 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

Last Answer : Answer: Option D

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 : 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

Last Answer : Answer: Option D

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 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

Last Answer : Answer: Option C

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

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

A simply supported beam is of rectangular section.It carries a uniformly distributed load over the whole span.The deflection at the centre is y.If the depth of beam is doubled ,the deflection at the centre would be a.2y b.4y c.y/2 d.y/8.

Description : A simply supported beam is of rectangular section.It carries a uniformly distributed load over the whole span.The deflection at the centre is y.If the depth of beam is doubled ,the deflection at the centre would be a.2y b.4y c.y/2 d.y/8.

Last Answer : d.y/8.

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 : 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

Last Answer : Answer: Option D

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. Select your answer based on the coding system given below: (A) Both A and R is true and R is the correct explanation of A (B) Both A and R is true but R is not the correct explanation of A (C) A is true but R is false (D) A is false but R is true

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

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

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

The most efficient section of a channel is (A) Triangular (B) Rectangular (C) Square (D) Trapezoidal

Description : The most efficient section of a channel is (A) Triangular (B) Rectangular (C) Square (D) Trapezoidal

Last Answer : Answer: Option D

The highest efficiency is obtained with a channel of __________ section. (A) Circular (B) Square (C) Rectangular (D) Trapezoidal

Description : The highest efficiency is obtained with a channel of __________ section. (A) Circular (B) Square (C) Rectangular (D) Trapezoidal

Last Answer : Answer: Option D

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

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

A weir is used to measure the large water discharge rate from a river or from an open channel. A weir is not of __________ shape. (A) Circular (B) Rectangular (C) Triangular (D) Trapezoidal

Description : A weir is used to measure the large water discharge rate from a river or from an open channel. A weir is not of __________ shape. (A) Circular (B) Rectangular (C) Triangular (D) Trapezoidal

Last Answer : (A) Circular