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Category: Fluid Mechanics for Chemical
Gear pump_________________?
A. Is a positive displacement pump
B. Is a centrifugal pump
C. Is a non-positive displacement pump
D. Can be started with delivery valve closed
Cp/Cv is termed as__________________?
A. Adiabatic constant
B. Mach number
C. Weber number
D. Prandtl number
A gas (density = 1.5 kg/m3, viscosity = 2 × 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 1.5 kg/m3and viscosity of 3 × 10‒5kg/m.s flowing at 3 m/s will be________________?
A. 8400 Pa/m
B. 12600 Pa/m
C. 18900 Pa/m
D. 16800 Pa/m
The rate of change of moment of momentum represents the ______________ by the fluid?
A. Torque applied
B. Force exerted
C. Work done
D. Power developed
For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance) ?
A. V/Vmax = (x/r)1/7
B. V/Vmax = (r/x)1/7
C. V/Vmax = (x.r)1/7
D. None of these
The Prandtl mixing length is_________________?
A. Zero at the pipe wall and is a universal constant
B. Independent of radial distance from the pipe axis
C. Independent of the shear stress
D. Useful for computing laminar flow problems
The inherent characteristic of an equal percentage valve relating flow rate ‘q’ with valve stem movement ‘x’ are described by the equation_________________?
A. dq/dx = K
B. dq/dx = K.q
C. dq/dx = K/q
D. dq/dx = Kq2
In case of a pipe exit fitted with a nozzle, the____________________?
A. Conversion of kinetic head to pressure head is facilitated
B. Conversion of pressure head to kinetic head is facilitated
C. Power transmitted through the nozzle is maximum, when the head lost due to friction in the
pipe is equal to one third of the total supply head
D. Both B. and C.
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