GATE Prev Year : Fluid Mechanics-6

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Question 1

The metacentric high of a passenger ship is kept lower than that of a naval or a cargo ship because

• Aapparent weight will increase
• Botherwise it will be in neutral equilibrium
• Cit will decrease the frequency of rolling
• Dotherwise it will sink and be totally immersed

Question 2

For a fully developed flow or water in a pipe having diameter 10 cm, velocity 0.1 m/s and kinematic viscosity , the value of Darcy friction factor is ____

• A0.064
• B0.0064
• C0.007
• D1.0

Question 3

Which one of the following statements is correct?

• AFor water at 100 ° Celsius at sea level, the vapour pressure is equal to atmospheric pressure.
• BSurface energy (or tension) is caused by the force of adhesion between liquid molecules.
• CViscosity of a fluid is the property exhibited by it both in static and in dynamic conditions.
• DAir is 5 00 times more compressible than water.

Question 4

A venturimeter of 20 mm throat diameter is used to measure the velocity of water in a horizontal pipe of 40 mm diameter. If the pressure difference between the pipe and throat sections is found to be 30 kPa then, neglecting frictional losses, the flow velocity is

• A0.2 m/s
• B1.0 m/s
• C1.4 m/s
• D2.0 m/s

Question 5

For fully developed laminar flow through a circular pipe with Reynolds number Rethe friction factor is

• AInversely proportional to Re
• BProportional to Re
• CProportional to square of Re
• DIndependent of Re

Question 6

For flow of the ideal fluid over a cylinder from the front stagnation point,

• Apressure first decreases then increases
• Bvelocity first decreases then increases
• Cpressure remains the same
• Dvelocity remains the same

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