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Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. Francis, Kaplan and propeller turbines fall under the category of

  2. A.

     Impulse turbines

    B.

     Reaction turbines

    C.

     Axial flow turbines

    D.

     Mixed flow turbines

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  3. Which of the following pump is successfully used for lifting water to the boilers?

  4. A.

     Centrifugal pump

    B.

     Reciprocating pump

    C.

     Jet pump

    D.

     Airlift pump

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  5. The value of mass density in kg-sec-V-m⁴ for water at 0°C is

  6. A.

     1

    B.

     1000

    C.

     100.9

    D.

     101.9

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  7. If a pump is handling water and is discharging a certain flow Q at a constant total dynamic head requiring a definite B.H.P., the same pump when handling a liquid of specific gravity 0.75 and viscosity nearly same as of water would discharge

  8. A.

     Same quantity of liquid

    B.

     0.75 Q

    C.

     Q/0.75

    D.

     1.5 Q

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  9. The torque required to overcome viscous resistance of a collar bearing is (where R1 and R2 = External and internal radius of collar)

  10. A.

     (μπ²N/60t) × (R₁ - R₂)

    B.

     (μπ²N/60t) × (R₁² - R₂²)

    C.

     μπ²N/60t) × (R₁³ - R₂³)

    D.

     (μπ²N/60t) × (R₁⁴ - R₂⁴)

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  11. In a reaction turbine, the draft tube is used

  12. A.

     To run the turbine full

    B.

     To prevent air to enter the turbine

    C.

     To increase the head of water by an amount equal to the height of the runner outlet above the tail race

    D.

     To transport water to downstream

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  13. In reaction turbine, draft tube is used

  14. A.

     To transport water downstream without eddies

    B.

     To convert the kinetic energy to flow energy by a gradual expansion of the flow cross-section

    C.

     For safety of turbine

    D.

     To increase flow rate

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  15. The flow rate in gear pump

  16. A.

     Increases with increase in pressure

    B.

     Decreases with increase in pressure

    C.

     More or less remains constant with increase in pressure

    D.

     Unpredictable

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  17. The increase of temperature results in

  18. A.

     Increase in viscosity of gas

    B.

     Increase in viscosity of liquid

    C.

     Decrease in viscosity of gas

    D.

     Decrease in viscosity of liquid

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  19. Runaway speed of a hydraulic turbine is

  20. A.

     Full load speed

    B.

     The speed at which turbine runner will be damaged

    C.

     The speed if the turbine runner is allowed to revolve freely without load and with the wicket gates wide open

    D.

     The speed corresponding to maximum overload permissible

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