1. Vacuum pressure at any point equal to (a) atmospheric pressure + absolute pre
ID: 2116504 • Letter: 1
Question
1. Vacuum pressure at any point equal to
(a) atmospheric pressure + absolute pressure
(b) atmospheric pressure + gauge pressure
(c) atmospheric pressure %u2212 absolute pressure
(d) none of the above
3. Newton's law of viscosity relates
(a) pressure and viscosity
(b) shear stress and pressure
(c) temperature and viscosity
(d) shear stress and velocity gradient
4. The centre of pressure for a vertical plane surface is always:
(a) At the centroid of the surface area
(b) Above the centroid of the surface area
(c) Below the centroid of the surface area
(d) None of the above
5. A floating body is stable (i.e. a small displacement from equilibrium produces a righting lever to restore the body to the equilibrium position) if:
(a) The centre of gravity is above the centre of buoyancy
(b) The metacentre of the floating body is above the centre of gravity
(c) The centre of gravity is above the metacentre
(d) The centre of gravity and the metacentre coincide
6. A neutral buoyant body submerged in water is stable (i.e. a small displacement from equilibrium produces a righting lever to restore the body to the equilibrium position) if:
(a) The centre of gravity is above the centre of buoyancy
(b) The centre of gravity and the centre of buoyancy coincide
(c) The centre of buoyancy is above the centre of gravity
(d) The metacentre is above the centre of gravity
7. A floating body in water displaces a volume of water equal to:
(a) Its own volume
(b) Its own weight
(c) Its submerged weight
(d) None of the above
8. Water flows in a 60 mm diameter at a pressure of 200 kPa. It flows out a 30 mm diameter nozzle to the atmosphere. Calculate the nozzle flow velocity.
(a) 6.12 m/s
(b) 5.16 m/s
(c) 7.30 m/s
(d) 8.94 m/s
9. The liquid in a piezometer stands 1.5 m above a point A in a pipe line. What is the pressure at A in N/m2 if the liquid has a specific gravity of 1.24?
(a) 14.7 kN/m2
(b) 12.5 kN/m2
(c) 200 kN/m2
(d) 18.3 kN/m2
10. The assumptions made in the derivation of Bernoulli's equation are that flow is
(a) incompressible and uniform
(b) incompressible, steady and uniform
(c) incompressible, steady and non-viscous
(d) incompressible, steady, non-viscous and irrotational
11. The average density of icebergs is about 917 kg/m3. Determine the percentage of the total volume of an iceberg submerged in seawater of density 1042 kg/m3.
(a) 12%
(b) 50%
(c) 88%
(d) 92%
12. A wooden block of width 3.0 m and depth 2.0, floats horizontally in water. The specific gravity of block is 0.7 and its length is 5 m. The weight of water displaced by the block will be
(a) 196.2 kN
(b) 206.0 kN
(c) 215.8 kN
(d) 225.6 kN
15. The hydraulic diameter of a duct with square cross section with each side having a length %u20182a%u2019
(a) 4a
(b) a
(c) a/4
(d) 2a
16. A pipeline of constant diameter is inclined upwards and carries water from point A to point B which is at 300 mm above. If the pressure at point A is 9.3 kN/m2, the pressure at B assuming no losses is
(a) 9 kN/m2
(b) 12.24 kN/m2
(c) 6.36 kN/m2
(d) 9.6 kN/m2
17. A liquid flows in a pipe at a Reynolds number of 3000. The flow is
(a) Laminar
(b) Turbulent
(c) Transitory, oscillating between laminar and turbulent
(d) Any of the above
18. Flow over which object can be considered as incompressible
(a) High speed aircraft
(b) Rocket
(c) Missile
(d) Submarine
19. For a turbulent flow in a pipe, which statement is correct?
(a) Pipe roughness, %u03B5 is a function of Reynolds number
(b) At very large Reynolds number, friction factor, f depends on the Reynolds number
(c) Friction factor, f can be computed using Moody diagram
(d) Relative roughness will vary with Reynolds number
20. Losses through fittings, valves, bends, elbows, tees etc. are called
(a) Major losses
(b) Darcy friction factor
(c) Dynamic pressure
(d) Minor losses
Please give the correct answers and necessary process, Thanks!
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