Diffusion
Centrifugal
Jet ejector
Piston
✅ The correct answer is option A.
Chemical Engineering MCQs
A perfect gas
Does not satisfy PV = nRT
Is incompressible and has zero viscosity
Has constant specific heat
Can’t develop shear stresses
✅ The correct answer is option C.
Liquid delivery by centrifugal pump starts, only when the head developed by it is equal to the __________ head.
Manometric
Total
Static
Friction
✅ The correct answer is option A.
In case of a rotameter, the density of the float material is __________ that of the liquid it replaces.
More than
Less than
Equal to
Either A or B
✅ The correct answer is option A.
Viscosity of a liquid decreases __________ with rise in temperature.
Exponentially
Linearly
Logarithmically
None of these
✅ The correct answer is option C.
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.