Fluid Mechanics - Study Mode

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[#176] The location of centre of pressure, which defines the point of application of the total pressure force on the surface, can be calculated by applying the principle of moments according to which "sum of the moment of the resultant force about an axis is equal to the sum of the components about the same axis". The centre of pressure of a rectangular surface (of width 'w') immersed vertically in a static mass of fluid is at a depth of (where, y = depth of the liquid)

(A) $$frac{1}{{3{ ext{y}}}}$$

(B) $$frac{{2{ ext{y}}}}{3}$$

(C) $$frac{1}{{4{ ext{y}}}}$$

(D) $$frac{{3{ ext{y}}}}{4}$$

Correct Answer

(B) $$frac{{2{ ext{y}}}}{3}$$

[#177] A special type of liquid transporting device is the diffuser pump, in which __________ are minimised.

(A) Bearing losses

(B) Disk friction

(C) Shock losses

(D) Cavitation

Correct Answer

(C) Shock losses

[#178] A pipe of I.D. 4 m is bifurcated into two pipes of I.D. 2 m each. If the average velocity of water flowing through the main pipe is 5 m/sec, the average velocity through the bifurcated pipes is

(A) 20 m/sec

(B) 10 m/sec

(C) $$5sqrt 2 $$ xa0m/sec

(D) 5 m/sec

Correct Answer

(B) 10 m/sec

[#179] Weber number is the ratio of inertial force to __________ force.

(A) Surface tension

(B) Gravity

(C) Viscous

(D) Elastic

Correct Answer

(A) Surface tension

[#180] One stoke (unit of kinematic viscosity) is equivalent to

(A) 1 cm 2 /second

(B) 1 m 2 /second

(C) 1 gm/cm.second

(D) 1 kg.m/second

Correct Answer

(A) 1 cm 2 /second