Mechanical Engineering MCQ Test Hydraulics - Set 28 - ObjectiveBooks

# Practice Test: Question Set - 28

1. Flow occurring in a pipeline when a valve is being opened is
(C) Laminar
(D) Vortex

2. The water pressure per metre length on a vertical masonry wall of dam is (where w = Specific weight of the liquid, and H = Height of the liquid)
(A) wH/2
(B) wH
(C) wH2/2
(D) wH2/4

3. Euler's equation in the differential form for the motion of liquids is given by
(A) dp/ρ + g.dz + v.dv = 0
(B) dp/ρ - g.dz + v.dv = 0
(C) ρ.dp + g.dz + v.dv = 0
(D) ρ.dp - g.dz + v.dv = 0

4. An open tank containing liquid is made to move from rest with a uniform acceleration. The angle 0 which the free surface of liquid makes with the horizontal is such that (where a = Horizontal acceleration of the tank, and g = Acceleration due to gravity)
(A) tanθ = a/g
(B) tanθ = 2 a/g
(C) tanθ = a/2g
(D) tanθ = a2/2g

5. The discharge through a small rectangular orifice is given by (where Cd = Coefficient of discharge for the orifice, a = Cross-sectional area of the orifice, h = Height of the liquid above the centre of the orifice)
(A) Q = Cd × a × 2gh
(B) Q = (2/3). Cd × a × h
(C) Q = (Cd × a)/√(2gh)
(D) Q = (3Cd × a)/√(2h)

6. When a body is placed over a liquid, it will float 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

7. A point, in a compressible flow where the velocity of fluid is zero, is called
(A) Critical point
(B) Vena contracta
(C) Stagnation point
(D) None of these

8. For very great pressures, viscosity of moss gases and liquids
(A) Remain same
(B) Increases
(C) Decreases
(D) Shows erratic behavior

9. A weir, generally, used as a spillway of a dam is
(A) Narrow crested weir
(C) Ogee weir
(D) Submerged weir

10. The angle of contact in case of a liquid depends upon
(A) The nature of the liquid and the solid
(B) The material which exists above the free surface of the liquid
(C) Both of die above
(D) Any one of the above

11. A flow in which each liquid particle has a definite path, and the paths of individual particles do not cross each other, is called
(B) Uniform flow
(C) Streamline flow
(D) Turbulent flow

12. The stability of a dam is checked for
(A) Tension at the base
(B) Overturning of the wall or dam
(C) Sliding of the wall or dam
(D) All of these

13. Water is _________ liquid.
(A) A compressible
(B) An incompressible
(C) Both A and B
(D) None of these

14. The unit of kinematic viscosity in S. I. units is
(A) N-m/s
(B) N-s/m2
(C) m2/s
(D) N-m

15. Bernoulli's equation is applied to
(A) Venturimeter
(B) Orifice meter
(C) Pitot tube
(D) All of these

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