Fluid Mechanics MCQs

Dimension of absolute viscosity is

Self-priming centrifugal pump can be used for

Co-efficient of discharge (C_d) is defined as actual discharge/theoretical discharge and is equal to C_c . C_v where C_c = Co-efficient of contraction and C_v = co-efficient of velocity. C_d of an orifice is usually about

In the low Reynolds number region, the drag force on a sphere is proportional to

A fluid element has a velocity V = -y² . xi + 2yx² . j. The motion at (x, y) = (l/√2, 1) is

Which is the correct relationship for a centrifugal pump? (where, D = Impeller diameter, inches H = Head developed, ft of liquid pumped N = Speed of pump, rpm)

A pressure of 10 m head of water is equivalent to __________ kN/m².

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

A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below:
Δ P/L = 375 × 10³ V_OM + 10.94 × 10⁶ V²_OM (SI units)
If water is to be used as the fluidising medium, in actual operation, the above bed has a height = 1 m. What is the porosity of the fluidised bed?