ISRO Mechanical Exam: Fluid Mechanics Quiz

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Question 1

Head loss in turbulent flow in a pipe

• AVaries directly as velocity
• BVaries inversely as square of velocity
• CVaries approximately as square of velocity
• DVaries inversely as velocity

Question 2

The pressure difference between the inside and outside of a liquid droplet of diameter d due to surface tension (σ) is given by the relation

• AΔP = 4σ/d
• BΔP = 8σ/d
• CΔP = 2σ/d
• DΔP = 6σ/d

Question 3

The velocity potential function satisfy the Laplace equation :
Then the flow is

• AUnsteady, incompressible, rotation
• BSteady, compressible, rotational
• CSteady, incompressible, irrotaional
• DUnsteady, compressible, irrotational

Question 4

Unstable equilibrium of a floating body implies________.

• AMetacentre M is above centre of gravity G
• BMetacentre M is below centre of gravity G
• CMetacentre M coincides with centre of gravity G
• DNone of these

Question 5

Froude number is significant in

• ASupersonics, as with projectile and jet propulsion
• BFull immersion or completely enclosed flow, as with pipes, air crafts wings, nozzles etc.
• CSimultaneous motion through two fluids where there is a surface discontinuity, gravity forces and wave making effect, as with ship’s hulls
• DAll of these

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