Fluid Mechanics - Practice Test

[#416] If Blausius or Darcey friction factor is 'f 1 ' then the Fanning friction factor is equal to

(A) $$frac{{{{ ext{f}}_1}}}{4}$$

(B) 4f 2

(C) 2f 1

(D) $$frac{{{{ ext{f}}_1}}}{2}$$

Correct Answer

(A) $$frac{{{{ ext{f}}_1}}}{4}$$

[#417] Nature of fluid flow during the opening of a valve in a pipeline is

(A) Laminar

(B) Unsteady

(C) Steady

(D) Uniform

Correct Answer

(B) Unsteady

[#418] The equivalent diameter for pressure drop calculation for a fluid flowing through a rectangular cross-section channels having sides 'x' & 'y' is given by

(A) $$frac{{2{ ext{xy}}}}{{{ ext{x}} + { ext{y}}}}$$

(B) $$frac{{{ ext{xy}}}}{{{ ext{x}} + { ext{y}}}}$$

(C) $$frac{{{ ext{x}} + { ext{y}}}}{{2{ ext{xy}}}}$$

(D) $$frac{{{ ext{x}} + { ext{y}}}}{{{ ext{xy}}}}$$

Correct Answer

(A) $$frac{{2{ ext{xy}}}}{{{ ext{x}} + { ext{y}}}}$$

[#419] Pick out the wrong statement about cavitation.

(A) Sudden reduction of pressure in a fluid flow system caused by flow separation, vortex formation or abrupt closing of valve leads to cavitation

(B) Cavitation may be caused due to boiling of liquid by decreasing the pressure resulting in formation & collapse of vapor cavities

(C) Cavitation begins at higher static pressure and lower velocity in larger diameter pipelines resulting in audible noise

(D) Large scale cavitation can not damage pipeline, restrict fluid flow and damage steam turbine blades

Correct Answer

(D) Large scale cavitation can not damage pipeline, restrict fluid flow and damage steam turbine blades

[#420] __________ forces act on a particle moving through a stationary fluid.

(A) Gravity

(B) Drag

(C) Buoyant

(D) All of the above

Correct Answer

(D) All of the above

Fluid Mechanics - Study Mode

[#416] If Blausius or Darcey friction factor is 'f 1 ' then the Fanning friction factor is equal to

Correct Answer

[#417] Nature of fluid flow during the opening of a valve in a pipeline is

Correct Answer

[#418] The equivalent diameter for pressure drop calculation for a fluid flowing through a rectangular cross-section channels having sides 'x' & 'y' is given by

Correct Answer

[#419] Pick out the wrong statement about cavitation.

Correct Answer

[#420] __________ forces act on a particle moving through a stationary fluid.

Correct Answer