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-1 section-3

The type of centrifugal pump preferred for a specific speed of 20 r.p.m. is

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

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Answer & Solution

Answer: Option A

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A Pelton wheel develops 1750 kW under a head of 100 meters while running at 200 r.p.m. and discharging 2500 liters of water per second. The unit speed of the wheel is

A) 10 r.p.m. B) 20 r.p.m. C) 40 r.p.m. D) 80 r.p.m.

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Answer & Solution

Answer: Option B

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An orifice is said to be large, if

A) The size of orifice is large B) The velocity of flow is large C) The available head of liquid is more than 5 times the height of orifice D) The available head of liquid is less than 5 times the height of orifice

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Answer & Solution

Answer: Option D

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A flow in which __________ force is dominating over the viscosity is called turbulent flow.

A) Elastic B) Surface tension C) Viscous D) Inertia

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Answer & Solution

Answer: Option D

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Which of the following meters is not associated with viscosity?

A) Red wood B) Say bolt C) Engler D) Orsat

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Answer & Solution

Answer: Option D

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The maximum hydraulic efficiency of an impulse turbine is (where $$\varphi $$ = Angle of blade tip at outlet)

A) $$\frac{{1 + \cos \varphi }}{2}$$ B) $$\frac{{1 - \cos \varphi }}{2}$$ C) $$\frac{{1 + \sin \varphi }}{2}$$ D) $$\frac{{1 - \sin \varphi }}{2}$$

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Answer & Solution

Answer: Option A

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According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, $$l$$ = Length of pipe, v = Velocity of liquid in pipe and d = Diameter of pipe)

A) $$\frac{{{\text{f}}l{{\text{v}}^2}}}{{2{\text{gd}}}}$$ B) $$\frac{{{\text{f}}l{{\text{v}}^2}}}{{{\text{gd}}}}$$ C) $$\frac{{3{\text{f}}l{{\text{v}}^2}}}{{2{\text{gd}}}}$$ D) $$\frac{{{\text{4f}}l{{\text{v}}^2}}}{{2{\text{gd}}}}$$

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Answer & Solution

Answer: Option D

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A flow whose streamline is represented by a straight line, is called __________ dimensional flow.

A) One B) Two C) Three D) Four

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Answer & Solution

Answer: Option A

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Which of the following pump is suitable for small discharge and high heads?

A) Centrifugal pump B) Axial flow pump C) Mixed flow pump D) Reciprocating pump

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Answer & Solution

Answer: Option D

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Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the

A) Force of adhesion B) Force of cohesion C) Force of friction D) Force of diffusion

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Answer & Solution

Answer: Option B

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

Hydraulics And Fluid Mechanics MCQ Questions & Answers | Mechanical Engineering