Mechanical Engineering Hydraulics online Test - Set 22

Practice Test: Question Set - 22


1. When a cylindrical vessel containing liquid is revolved about its vertical axis at a constant angular velocity, the pressure
    (A) Varies as the square of the radial distance
    (B) Increases linearly as its radial distance
    (C) Increases as the square of the radial distance
    (D) Decreases as the square of the radial distance

2. Property of a fluid by which its own molecules are attracted is called
    (A) Adhesion
    (B) Cohesion
    (C) Viscosity
    (D) Compressibility

3. According to Bazin's formula, the discharge over a rectangular weir is mL2g x H3/2where m is equal to
    (A) 0.405 + (0.003/H)
    (B) 0.003 + (0.405/H)
    (C) 0.405 + (H/0.003)
    (D) 0.003 + (H/0.405)

4. Which of the following is the unit of kinematic viscosity?
    (A) Pascal
    (B) Poise
    (C) Stoke
    (D) Faraday

5. The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly contracted to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is
    (A) v₁²/2g
    (B) v₂²/2g
    (C) 0.5 v₁²/2g
    (D) 0.375 v₂²/2g

6. Operation of McLeod gauge used for low pressure measurement is based on the principle of
    (A) Gas law
    (B) Boyle's law
    (C) Charles law
    (D) Pascal's law

7. Reynold's number is the ratio of the inertia force to the
    (A) Surface tension force
    (B) Viscous force
    (C) Gravity force
    (D) Elastic force

8. A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is
    (A) 1
    (B) 5
    (C) 7
    (D) 6

9. A differential manometer is used to measure
    (A) Atmospheric pressure
    (B) Pressure in pipes and channels
    (C) Pressure in Venturimeter
    (D) Difference of pressures between two points in a pipe

10. In a lock-gate, the reaction between two gates is (where P = Resultant pressure on the lock gate, and α = Inclination of the gate with the normal to the side of the lock)
    (A) p/sinα
    (B) 2p/sinα
    (C) p/2sinα
    (D) 2p/sin (α/2)

11. In a venturi-flume, the flow takes place at
    (A) Atmospheric pressure
    (B) Gauge pressure
    (C) Absolute pressure
    (D) None of these

12. The normal stress is same in all directions at a point in a fluid
    (A) Only when the fluid is frictionless
    (B) Only when the fluid is incompressible and has zero viscosity
    (C) When there is no motion of one fluid layer relative to an adjacent layer
    (D) Irrespective of the motion of one fluid layer relative to an adjacent layer

13. The highest efficiency is obtained with a channel of __________ section.
    (A) Circular
    (B) Square
    (C) Rectangular
    (D) Trapezoidal

14. A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall per unit length is (where w = Specific weight of liquid, and H = Height of liquid)
    (A) wH
    (B) wH/2
    (C) wH2/2
    (D) wH2/3

15. Which of the following manometer has highest sensitivity?
    (A) U-tube with water
    (B) Inclined U-tube
    (C) U-tube with mercury
    (D) Micro-manometer with water

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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
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