Hydraulics And Fluid Mechanics MCQ Questions & Answers

Hydraulics And Fluid Mechanics MCQ Questions & Answers | Mechanical Engineering

Learn Hydraulics And Fluid Mechanics MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Hydraulics And Fluid Mechanics MCQ question is the important chapter for a Mechanical Engineering and GATE students. Page-10 section-1

The centrifugal pump preferred for a specific speed between 80 to 160 r.p.m. is

A) Slow speed with radial flow at outlet B) Medium speed with radial flow at outlet C) High speed with radial flow at outlet D) High speed with mixed flow at outlet

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Answer & Solution

Answer: Option D

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Which of the following pump is successfully used for lifting water to the turbines?

A) Centrifugal pump B) Reciprocating pump C) Jet pump D) Air lift pump

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Answer & Solution

Answer: Option C

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Which of the following statement is correct as regard to water wheels?

A) They have slow speeds B) They are suitable even for low water heads C) They give constant efficiency, even if the discharge is not constant D) All of the above

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Answer & Solution

Answer: Option D

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The kinematic viscosity is the

A) Ratio of absolute viscosity to the density of the liquid B) Ratio of density of the liquid to the absolute viscosity C) Product of absolute viscosity and density of the liquid D) Product of absolute viscosity and mass of the liquid

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Answer & Solution

Answer: Option A

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The viscosity of water at 20°C is

A) One stoke B) One centistoke C) One poise D) One centipoise

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Answer & Solution

Answer: Option D

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A vertically immersed surface is shown in the below figure. The distance of its centre of pressure from the water surface is
Hydraulics and Fluid Mechanics in ME mcq question image

Hydraulics and Fluid Mechanics in ME mcq question image

A) $$\frac{{{\text{b}}{{\text{d}}^2}}}{{12}} + \overline {\text{x}} $$ B) $$\frac{{{{\text{d}}^2}}}{{12\overline {\text{x}} }} + \overline {\text{x}} $$ C) $$\frac{{{{\text{b}}^2}}}{{12}} + \overline {\text{x}} $$ D) $$\frac{{{{\text{d}}^2}}}{{12}} + \overline {\text{x}} $$

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Answer & Solution

Answer: Option B

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The sheet of water flowing over a notch or a weir is known as

A) Sill or crest B) Nappe or vein C) Orifice D) None of these

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Answer & Solution

Answer: Option B

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When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as

A) Narrow-crested weir B) Broad-crested weir C) Ogee weir D) Submerged weir

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Answer & Solution

Answer: Option D

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The pressure in Pascal’s at a depth of 1 m below the free surface of a body of water will be equal to

A) 1 Pa B) 91 Pa C) 981 Pa D) 9810 Pa

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Answer & Solution

Answer: Option D

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100

The total pressure on the top of a closed cylindrical vessel completely filled up with a liquid is

A) Directly proportional to (radius)² B) Inversely proportional to (radius)² C) Directly proportional to (radius)⁴ D) Inversely proportional to (radius)⁴

Discuss

Answer & Solution

Answer: Option C

Solution:

The total pressure on the top of a closed cylindrical vessel completely filled with a liquid is directly proportional to (radius)⁴. This phenomenon is a result of the distribution of pressure in a fluid due to its weight.
When a vessel is completely filled with liquid, the pressure at a specific depth is determined by the weight of the liquid above that level. The pressure at any point within a static fluid is proportional to the height of the fluid column above that point. For a cylindrical vessel, the pressure distribution is influenced by the cross-sectional area, which is proportional to the square of the radius.
Since the pressure is directly related to the height of the liquid column and the area of the cross-section (which is proportional to the radius squared), the total pressure on the top of the vessel will be directly proportional to (radius)² * (radius)², which simplifies to (radius)⁴.

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

Hydraulics And Fluid Mechanics MCQ Questions & Answers | Mechanical Engineering