Hydraulics And Fluid Mechanics MCQ Questions & Answers

81

The discharge through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.

A) 0.34 times B) 0.67 times C) 0.81 times D) 0.95 times

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Answer & Solution

Answer: Option D

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82

The discharge over a rectangular weir, considering the velocity of approach, is (where H₁ = H + H_a)
(H₁ = Total height of water above the weir, H = Height of water over the crest of the weir and H_a = Height of water due to velocity of approach)

A) $$\frac{2}{3}{{\text{C}}_{\text{d}}} \times {\text{L}}\sqrt {2{\text{g}}} \left[ {{{\text{H}}_1} - {{\text{H}}_{\text{a}}}} \right]$$ B) $$\frac{2}{3}{{\text{C}}_{\text{d}}} \times {\text{L}}\sqrt {2{\text{g}}} \left[ {{\text{H}}_1^{\frac{3}{2}} - {\text{H}}_{\text{a}}^{\frac{3}{2}}} \right]$$ C) $$\frac{2}{3}{{\text{C}}_{\text{d}}} \times {\text{L}}\sqrt {2{\text{g}}} \left[ {{\text{H}}_1^2 - {\text{H}}_{\text{a}}^2} \right]$$ D) $$\frac{2}{3}{{\text{C}}_{\text{d}}} \times {\text{L}}\sqrt {2{\text{g}}} \left[ {{\text{H}}_1^{\frac{5}{2}} - {\text{H}}_{\text{a}}^{\frac{5}{2}}} \right]$$

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Answer & Solution

Answer: Option B

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83

A liquid compressed in cylinder has a volume of 0.04 m³ at 50 kg/cm² and a volume of 0.039 m³ at 150 kg/cm². The bulk modulus of elasticity of liquid is

A) 400 kg/cm² B) 4000 kg/cm² C) 40 × 10⁵ kg/cm² D) 40 × 10⁶ kg/cm²

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Answer & Solution

Answer: Option B

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84

The total energy of each particle at various places in the case of perfect incompressible fluid flowing in continuous stream

A) Keeps on increasing B) Keeps on decreasing C) Remain constant D) May increase/decrease

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Answer & Solution

Answer: Option C

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85

Select the correct statement

A) Weber's number is the ratio of inertia force to elastic force B) Weber's number is the ratio of gravity force to surface tension force C) Weber's number is the ratio of viscous force to pressure force D) Weber's number is the ratio of inertia force to surface tension force

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Answer: Option D

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86

Select the correct statement

A) Local atmospheric pressure depends upon elevation of locality only B) Standard atmospheric pressure is the mean local atmospheric pressure at sea level C) Local atmospheric pressure is always below standard atmospheric pressure D) A barometer reads the difference between local and standard atmospheric pressure

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Answer & Solution

Answer: Option B

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87

The discharge in an open channel corresponding to critical depth is

A) Zero B) Minimum C) Maximum D) None of these

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Answer & Solution

Answer: Option C

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88

A 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

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Answer: Option D

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89

When the coefficient of discharge (C_d) is 0.623, then the general equation for discharge over a rectangular weir is

A) $$1.84\left( {{\text{L}} - 0.1{\text{nH}}} \right){{\text{H}}^{\frac{3}{2}}}$$ B) $$1.84\left( {{\text{L}} - {\text{nH}}} \right){{\text{H}}^2}$$ C) $$1.84\left( {{\text{L}} - 0.1{\text{nH}}} \right){{\text{H}}^{\frac{5}{2}}}$$ D) $$1.84\left( {{\text{L}} - {\text{nH}}} \right){{\text{H}}^3}$$

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Answer & Solution

Answer: Option A

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90

The length AB of a pipe ABC in which the liquid is flowing has diameter (d₁) and is suddenly contracted to diameter (d₂) at B which is constant for the length BC. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is

A) $$\frac{{{\text{v}}_1^2}}{{2{\text{g}}}}$$ B) $$\frac{{{\text{v}}_2^2}}{{2{\text{g}}}}$$ C) $$\frac{{0.5{\text{v}}_1^2}}{{2{\text{g}}}}$$ D) $$\frac{{0.375{\text{v}}_2^2}}{{2{\text{g}}}}$$

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Answer: Option D

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Hydraulics And Fluid Mechanics MCQ Questions &amp; Answers | Mechanical Engineering

Hydraulics And Fluid Mechanics MCQ Questions & Answers | Mechanical Engineering