Fluid Mechanics - Practice Test

[#286] 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

Correct Answer

(D) All of the above

[#287] Head developed by a centrifugal pump depends on its

(A) Speed

(B) Impeller diameter

(C) Both A and B

(D) Neither A nor B

Correct Answer

(C) Both A and B

[#288] Each term of the Bernoulli's equation written in the form, $$frac{{ ext{p}}}{
ho } + frac{{ ext{g}}}{{{{ ext{g}}_{ ext{c}}}}} cdot { ext{Z}} + frac{{{{ ext{v}}^2}}}{{2{{ ext{g}}_{ ext{c}}}}} = { ext{constant,}}$$ xa0 xa0 xa0represents the total energy per unit

(A) Mass

(B) Volume

(C) Specific weight

(D) None of these

Correct Answer

(A) Mass

[#289] 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

Correct Answer

(C) Both A and B

[#290] 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

(E) Reduction of pressure below vapour pressure

(F) Reduction of pressure gradient to zero

(G) Adverse pressure gradient

(H) Reduction of boundary layer thickness to zero

Correct Answer

(D) Reduction of pressure gradient to zero
(G) Adverse pressure gradient

Fluid Mechanics - Study Mode

[#286] Pick out the correct statement pertaining to transition/ entrance length in fluid flow.

Correct Answer

[#287] Head developed by a centrifugal pump depends on its

Correct Answer

[#288] Each term of the Bernoulli's equation written in the form, $$frac{{ ext{p}}}{ ho } + frac{{ ext{g}}}{{{{ ext{g}}_{ ext{c}}}}} cdot { ext{Z}} + frac{{{{ ext{v}}^2}}}{{2{{ ext{g}}_{ ext{c}}}}} = { ext{constant,}}$$ xa0 xa0 xa0represents the total energy per unit

Correct Answer

[#289] The rate of shear versus the shear stress curves are time dependent for __________ fluid.

Correct Answer

[#290] Boundary layer separation is caused by the

Correct Answer

[#288] Each term of the Bernoulli's equation written in the form, $$frac{{ ext{p}}}{
ho } + frac{{ ext{g}}}{{{{ ext{g}}_{ ext{c}}}}} cdot { ext{Z}} + frac{{{{ ext{v}}^2}}}{{2{{ ext{g}}_{ ext{c}}}}} = { ext{constant,}}$$ xa0 xa0 xa0represents the total energy per unit