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Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. Two pipe systems can be said to be equivalent, when the following quantities are same

  2. A.

     Friction loss and flow

    B.

     Length and diameter

    C.

     Flow and length

    D.

     Friction factor and diameter


  3. At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be

  4. A.

     Minimum

    B.

     Maximum

    C.

     Zero

    D.

     Could be any value


  5. If the ratio's of the corresponding forces acting at corresponding points are equal, then the model and the prototype are said to have.

  6. A.

     Geometric similarity

    B.

     Kinematic similarity

    C.

     Dynamic similarity

    D.

     None of these


  7. The discharge through a reaction turbine with increase in unit speed

  8. A.

     Increases

    B.

     Decreases

    C.

     Remain unaffected

    D.

     First increases and then decreases


  9. The specific speed of a centrifugal pump, delivering 750 liters of water per second against a head of 15 meters at 725 r.p.m., is

  10. A.

     24.8 r.p.m.

    B.

     48.2 r.p.m

    C.

     82.4 r.p.m.

    D.

     248 r.p.m


  11. The specific weight of sea water is __________ that of pure water.

  12. A.

     Same as

    B.

     Less than

    C.

     More than

    D.

     None of these


  13. When a body is immersed wholly or partially in a liquid, it is lifted up by a force equal to the weight of liquid displaced by the body. This statement is called

  14. A.

     Pascal’s law

    B.

     Archimedes’s principle

    C.

     Principle of flotation

    D.

     Bernoulli’s theorem


  15. For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called

  16. A.

     Continuity equation

    B.

     Bernoulli’s equation

    C.

     Pascal’s law

    D.

     Archimedes’s principle


  17. The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called

  18. A.

     Newton's law of motion

    B.

     Newton's law of cooling

    C.

     Newton's law of viscosity

    D.

     Newton's law of resistance


  19. A moving fluid mass may be brought to a static equilibrium position, by applying an imaginary inertia force of the same magnitude as that of the accelerating force but in the opposite direction. This statement is called

  20. A.

     Pascal’s law

    B.

     Archimedes’s principle

    C.

     D-Alembert’s principle

    D.

     None of these