6461. Friction produced by the formation of wakes is called the __________ friction.
Disk
Skin
Form
None of these
✅ The correct answer is option C.
Chemical Engineering
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6462. The unit of dynamic viscosity in SI unit is
kg/m . sec
N/m²
m² /sec
m/N. sec
✅ The correct answer is option A.
6463. What is the force required (in Newtons) to hold a spherical balloon stationary in water at a depth of H from the air-water iterface? The balloon is of radius 0.1 m and is filled with air.
4πg/3
0.01πgH/4
0.01πgH/8
0.04πgH/3
✅ The correct answer is option A.
6464. Which of the following is not an advantage of fluidisation from transfer operation point of view?
Intimate contact of the fluid with all parts of the solid particles
Lower fluid pumping power requirement
Minimisation of temperature variation
Prevention of particle seggregation
✅ The correct answer is option B.
6465. Newton’s law of viscosity relates the
Shear stress and velocity
Velocity gradient and pressure intensity
Shear stress and rate of angular deformation in a fluid
Pressure gradient and rate of angular deformation
✅ The correct answer is option C.
6466. Vena-contracta formed during flow of a liquid through an orificemeter has
Minimum liquid cross-section
More diameter compared to orifice diameter
Minimum velocity of fluid stream
None of these
✅ The correct answer is option A.
6467. Which of the following options will facilitate the achievement of a very high head (say 30 metres) in case of a centrifugal pump?
Increasing the impeller speed and the volute area
Increasing the number of vanes in the impeller
Mounting of two or more impellers in series on a single shaft
Either of A, B or C
✅ The correct answer is option C.
6468. Path followed by water jet issuing from the bottom of a water tank will be a
Parabola (vertex being at the opening)
Hyperbola
Horizontal straight line
Zig-zag path (which is geometrically undefined)
✅ The correct answer is option A.
6469. __________ pumps are axial flow pumps.
Turbine
Propeller
Diffuser
None of these
✅ The correct answer is option B.
6470. Turbine impeller
Produces only radial current
Produces only tangential current
Is effective over wide range of viscosities
Does not produce tangential current
✅ The correct answer is option C.