Mechanical Engineering Hydraulics MCQ Test - Set 23

Practice Test: Question Set - 23

1. The velocity corresponding to Reynold number of 2800, is called
    (A) Sub-sonic velocity
    (B) Super-sonic velocity
    (C) Lower critical velocity
    (D) Higher critical velocity

2. For a floating body to be in equilibrium
    (A) Meta centre should be above e.g.
    (B) Centre of buoyancy and e.g. must lie on same vertical plane
    (C) A righting couple should be formed
    (D) All of the above

3. When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece, and H = Height of liquid above the mouthpiece)
    (A) 0.5 a. √2gH
    (B) 0.707 a. √2gH
    (C) 0.855 a. √2gH
    (D) a. √2gH

4. A uniform body 3 m long, 2 m wide and 1 m deep floats in water. If the depth of immersion is 0.6 m, then the weight of the body is
    (A) 3.53 kN
    (B) 33.3 kN
    (C) 35.3 kN
    (D) None of these

5. The force per unit length is the unit of
    (A) Surface tension
    (B) Compressibility
    (C) Capillarity
    (D) Viscosity

6. When the Mach number is more than 6, the flow is called
    (A) Sub-sonic flow
    (B) Sonic flow
    (C) Super-sonic flow
    (D) Hyper-sonic flow

7. The upper surface of a weir over which water flows is known is
    (A) Crest
    (B) Nappy
    (C) Sill
    (D) Weir top

8. One cubic metre of water weighs
    (A) 100 liters
    (B) 250 liters
    (C) 500 liters
    (D) 1000 liters

9. Kinematic viscosity is dependent upon
    (A) Pressure
    (B) Distance
    (C) Density
    (D) Flow

10. The discharge through a large rectangular orifice is given by (where H1 = Height of the liquid above the top of the orifice, H2 = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice, and Cd = Coefficient of discharge)
    (A) Q = (2/3) Cd × b × (2g) × (H2 - H1)
    (B) Q = (2/3) Cd × b × (2g) × (H21/2 - H11/2)
    (C) Q = (2/3) Cd × b × (2g) × (H23/2 - H13/2)
    (D) Q = (2/3) Cd × b × (2g) × (H22 - H12)

11. An error of 1% in measuring head over the apex of the notch (H) will produce an error of _________ in discharge over a triangular notch.
    (A) 1 %
    (B) 1.5 %
    (C) 2 %
    (D) 2.5 %

12. The Euler's equation for the motion of liquids is based upon the assumption that
    (A) The fluid is non - viscous, homogeneous and incompressible
    (B) The velocity of flow is uniform over the section
    (C) The flow is continuous, steady and along the stream line
    (D) All of the above

13. The ratio of the inertia force to the viscous force is called
    (A) Reynold's number
    (B) Froude's number
    (C) Weber's number
    (D) Euler's number

14. The total energy of a liquid particle in motion is equal to
    (A) Pressure energy + kinetic energy + potential energy
    (B) Pressure energy - (kinetic energy + potential energy)
    (C) Potential energy - (pressure energy + kinetic energy
    (D) Kinetic energy - (pressure energy + potential energy)

15. Which of the following instrument can be used for measuring speed of a submarine moving in deep sea?
    (A) Venturimeter
    (B) Orifice plate
    (C) Hot wire anemometer
    (D) Pitot tube

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Item Reviewed: Mechanical Engineering Hydraulics MCQ Test - Set 23 Rating: 5 Reviewed By: Pranab Debnath
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