Hydraulics and Fluid Mechanics MCQ - Set 01

Practice Test: Question Set - 01

1. When a body is placed over a liquid, it will sink down if
    (A) Gravitational force is equal to the up-thrust of the liquid
    (B) Gravitational force is less than the up-thrust of the liquid
    (C) Gravitational force is more than the up-thrust of the liquid
    (D) None of the above

2. The property by virtue of which a liquid opposes relative motion between its different layers is called
    (A) Surface tension
    (B) Coefficient of viscosity
    (C) Viscosity
    (D) Osmosis

3. A weir is said to be narrow-crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.
    (A) Equal to
    (B) Less than
    (C) More than
    (D) None of these

4. Euler's dimensionless number relates the following
    (A) Inertial force and gravity
    (B) Viscous force and inertial force
    (C) Viscous force and buoyancy force
    (D) Pressure force and inertial force

5. When a body floating in a liquid, is displaced slightly, it oscillates about
    (A) C.G. of body
    (B) Center of pressure
    (C) Center of buoyancy
    (D) Metacentre

6. The pressure of the liquid flowing through the divergent portion of a Venturimeter
    (A) Remains constant
    (B) Increases
    (C) Decreases
    (D) Depends upon mass of liquid

7. When the Mach number is between __________ the flow is called super-sonic flow.
    (A) 1 and 2.5
    (B) 2.5 and 4
    (C) 4 and 6
    (D) 1 and 6

8. In an immersed body, centre of pressure is
    (A) At the centre of gravity
    (B) Above the centre of gravity
    (C) Below be centre of gravity
    (D) Could be above or below e.g. depending on density of body and liquid

9. A vertically immersed surface is shown in the below figure. The distance of its centre of pressure from the water surface is

    (A) (bd²/12) +
    (B) (d²/12 ) +
    (C) b²/12 +
    (D) d²/12 +

10. The torque required to overcome viscous resistance of a collar bearing is              (where R1 and R2 = External and internal radius of collar)
    (A) (μπ²N/60t) × (R₁ - R₂)
    (B) (μπ²N/60t) × (R₁² - R₂²)
    (C) μπ²N/60t) × (R₁³ - R₂³)
    (D) (μπ²N/60t) × (R₁⁴ - R₂⁴)

11. Steady flow occurs when
    (A) The direction and magnitude of the velocity at all points are identical
    (B) The velocity of successive fluid particles, at any point, is the same at successive periods of time
    (C) The magnitude and direction of the velocity do not change from point to point in the fluid
    (D) The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane

12. A flow is called super-sonic if the
    (A) Velocity of flow is very high
    (B) Discharge is difficult to measure
    (C) Mach number is between 1 and 6
    (D) None of these

13. In a forced vortex, the velocity of flow everywhere within the fluid is
    (A) Maximum
    (B) Minimum
    (C) Zero
    (D) Nonzero finite

14. The depth of centre of pressure (h) for a vertically immersed surface from the liquid surface is given by (where IG = Moment of inertia of the immersed surface about horizontal axis through its centre of gravity, A = Area of immersed surface, and x = Depth of centre of gravity of the immersed surface from the liquid surface)
    (A) (IG/A) -
    (B) (IG/x̅) - A
    (C) (A/IG) +
    (D) (IG/A) +

15. Mach number is significant in
    (A) Supersonics, as with projectiles and jet propulsion
    (B) Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
    (C) Simultaneous motion through two fluids where there is a surface of discontinuity, gravity force, and wave making effects, as with ship's hulls
    (D) All of the above

Show and hide multiple DIV using JavaScript View All Answers

Hydraulics and Fluid Mechanics:
  Set 01      Set 02      Set 03      Set 04      Set 05      Set 06      Set 07      Set 08      Set 09
  Set 10      Set 11      Set 12      Set 13      Set 14      Set 15      Set 16      Set 17      Set 18
  Set 19      Set 20      Set 21      Set 22      Set 23      Set 24      Set 25      Set 26      Set 27
  Set 28      Set 29      Set 30      Set 31      Set 32      Set 33      Set 34
Share on Google Plus

    FB Comments


Post a Comment