Fluid Mechanics MCQ Questions & Answers

1

Creeping flow around a sphere is defined, when particle Reynolds number is

A) < 2100 B) < 0.1 C) > 2.5 D) < 500

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Answer & Solution

Answer: Option B

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2

Laminar flow of a Newtonion fluid ceases to exist, when the Reynolds number exceeds

A) 4000 B) 2100 C) 1500 D) 3000

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Answer & Solution

Answer: Option B

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3

Specific speed of a centrifugal pump depends upon the __________ head.

A) Suction B) Delivery C) Manometric D) None of these

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Answer: Option D

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4

The energy equation, $${\text{E}} + \frac{{\text{P}}}{\rho } + \frac{{{{\text{V}}^2}}}{{2{\text{g}}}} + {\text{gZ}} = {\text{constant}}$$ (E = internal energy/mass), is applicable to

A) Perfect gases only B) Isothermal flow of gases C) Adiabatic unsteady flow of gases D) All of the above

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Answer: Option D

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5

The dimension of dynamic viscosity is

A) ML^-1T^-1 B) L²T^-1 C) LT^-2 D) ML^-1T^-2

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Answer & Solution

Answer: Option A

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6

Pick out the correct statement pertaining to transition/ entrance length in fluid flow.

A) The length of entrance region of pipe, in which full development of fluid flow takes place such that velocity profile does not change downstream, is called the transition length B) Transition length for laminar flow of Newtonion fluids in a pipe of diameter 'd' is equal to 0.05. D.N_Re C) Transition length for turbulent flow of Newtonion fluids in a smooth pipe of diameter 'd' is equal to 50 D D) All of the above

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Answer: Option D

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7

Head developed by a centrifugal pump depends on its

A) Speed B) Impeller diameter C) Both A and B D) Neither A nor B

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Answer & Solution

Answer: Option C

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8

Each term of the Bernoulli's equation written in the form, $$\frac{{\text{p}}}{\rho } + \frac{{\text{g}}}{{{{\text{g}}_{\text{c}}}}} \cdot {\text{Z}} + \frac{{{{\text{v}}^2}}}{{2{{\text{g}}_{\text{c}}}}} = {\text{constant,}}$$ represents the total energy per unit

A) Mass B) Volume C) Specific weight D) None of these

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Answer & Solution

Answer: Option A

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9

The rate of shear versus the shear stress curves are time dependent for __________ fluid.

A) Thixotropic B) Rheopectic C) Both A and B D) Neither A nor B

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Answer & Solution

Answer: Option C

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10

Boundary layer separation is caused by the

A) Reduction of pressure to vapour pressure B) Boundary layer thickness reducing to zero C) Adverse pressure gradient D) Reduction of pressure gradient to zero

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Answer & Solution

Answer: Option D

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Fluid Mechanics MCQ Questions & Answers | Chemical Engineering