Non-steady uniform
Non-steady non-uniform
Steady uniform
Steady non-uniform
✅ The correct answer is option A.
Fluid Mechanics MCQs
__________ forces act on a particle moving through a stationary fluid.
Gravity
Drag
Buoyant
All of the above
✅ The correct answer is option D.
Which of the following is not dimension-less?
Froude number
Kinematic viscosity
Pressure co-efficient
None of these
✅ The correct answer is option B.
Centre of pressure in an immersed body is __________ the centre of gravity.
Above
Below
At
Either above or below; depends on the liquid density
✅ The correct answer is option B.
Which of the following is not concerned with the fluid-particle interaction?
Drag co-efficient
Froude number
Galileo number
Weber number
✅ The correct answer is option D.
The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is
√(HW/π)
HW/2(H + W)²
HW/4(H + W)²
2HW/(H + W)²
✅ The correct answer is option B.
A gas (density = 1.5 kg/m³ , viscosity = 2x 10⁻⁵ kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5kg/m³and viscosity of 3 x 10⁻⁵kg/m.s flowing at 3 m/s will be
8400 Pa/m
12600 Pa/m
18900 Pa/m
16800 Pa/m
✅ The correct answer is option B.
The location of centre of pressure, which defines the point of application of the total pressure force on the surface, can be calculated by applying the principle of moments according to which “sum of the moment of the resultant force about an axis is equal to the sum of the components about the same axis”. The centre of pressure of a rectangular surface (of width ‘w’) immersed vertically in a static mass of fluid is at a depth of(where, y = depth of the liquid)
1/3y
2y/3
1/4y
3y/4
✅ The correct answer is option B.
A 0.5 m high bed made up of a 1 mm dia glass sphere (density 2500 kg/m³ ) is to be fluidised by water (density 1000 kg/m³ ). If at the point of incipient fluidisation, the bed voidage is 40%, the pressure drop across the bed is
4.4 KPa
2.94 KPa
3.7 KPa
None of these
✅ The correct answer is option A.
The terminal velocity of a particle moving through a fluid varies as dpn. What is the value of n’ for Newton’s law regime?
0.5
1
1.5
3
✅ The correct answer is option A.