A. Roughness of surface of the body
B. Pressure of main flow only
C. Length of the body in flow direction
D. All A., B. and C.
Correct Answer: D. All A., B. and C. ✔
Last Updated: March 10, 2019
Related MCQs
- With increase in pump speed, its NPSH requirement__________?
- The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a __________ fluid?
- Nominal size of a pipe is an indication of its __________ diameter?
- The velocity profile for turbulent flow through a closed conduit is__________?
- Brownian movement is prominent in the particle size range of __________ microns in case of settling of a particle in a fluid?
- A fluid is the one, which__________?
- Which of the following is not a dimension-less parameter ?
- Steady uniform flow is represented by flow through a/an __________?
- With increasing flow rate, the hydraulic efficiency of a centrifugal pump__________?
- Ratio of pressure and inertia force gives __________ number?
- Most commonly used joint in the underground pipe lines is the__________?
- Gear pump__________?
- For a particle settling in water at its terminal settling velocity, which of the following is true ?
- In a fully turbulent flow (Re > 105) in a pipe of diameter ‘d’, for a constant pressure gradient, the dependence of volumetric flow rate of an incompressible fluid is__________?
- __________ pumps are axial flow pumps?
- Which of the following equations as suggested by Colebrook and White gives the increase in roughness of a new surface (ε0) with age/time (t) (where, ε = roughness of the surface after time’t’. α = a co-efficient to be experimentally determined) ?
- The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is__________?
- Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will__________?
- Which of the following denotes the effect of compressibility in fluid flow ?
- 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__________?
- Hydraulic mean depth (Dm) for a circular pipe of diameter ‘D’ flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum ?
- Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, ζ = surface tension of mercury)__________?
- Shear stress in a fluid flowing in a round pipe__________?
- Bed pressure drop in an air fluidised bed of catalyst particles (ρp = 200 kg/m3, Dp = 0.05 cm) of 60 cm bed depth and bed porosity of 0.5 expressed in cm of water (manometer) is__________?
- For the transfer of solution of thick slurry, the pump used is a __________ pump?
- In fluid flow, cavitation is caused, if the__________?
- Cavitation can be prevented by__________?
- Sewage sludge is __________ type of non-Newtonian fluid?
- At high Reynolds number__________?
- Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the__________?
- Head developed by a centrifugal pump depends on its__________?
- Pump used for the transportation of molten sodium in a fast breader reactor is a/an __________ pump?
- 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) ?
- The terminal velocity of a particle moving through a fluid varies as dp n. The value of n is equal to __________ in Stoke’s law regime?
- Maximum theoretical suction lift for water at 15°C by a centrifugal pump is 34 ft. The same for water at 90°C will be __________ ft?
- For the same terminal conditions and valve size, the pressure drop in a fully opened globe valve as compared to that in a gate valve is__________?
- A piezometer opening measures the __________ fluid pressure?
- The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10-6m2/s) ?
- A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke’s law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity ?
- With increase in the shear rate, the apparent viscosity of pseudo-plastic fluids__________?
- If the discharge of a centrifugal pump is throttled, then its suction lift__________?
- Kinetic energy of fluid per unit weight represented by the velocity head is given by__________?
- Water hammer in a pipeline results from the__________?
- Mass velocity is independent of temperature & pressure, when the flow is__________?
- Permanent loss in a Venturimeter is about __________ percent of the pressure drop in the upstream cone?
- The uniformity of a gas fluidised bed depends upon the __________ of the solid particles?
- Most of the centrifugal pumps used in chemical plants are usually __________ driven?
- Remote control valve is a __________ valve?
- With increase in temperature, the vapor pressure of liquids__________?
- Medium viscosity lubricating oil can be most ideally pumped by a __________ pump?
- Differential manometer measures the__________?