5921. In case of a centrifugal pump, the ratio of total delivered pressure to pressure developed with the impeller is called the __________ efficiency.
Manometric
Mechanical
Volumetric
Overall
✅ The correct answer is option A.
Chemical Engineering
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5922. With increase in temperature, the vapor pressure of liquids
Increases
Increases linearly
Decreases
Remains constant
✅ The correct answer is option A.
5923. Nominal size of the discharge pipe of a pump is usually __________ the nominal size of the inlet pipe.
Smaller than
Larger than
Same as
Twice
✅ The correct answer is option A.
5924. Uniform fluid flow occurs, when the derivative of the flow variables satisfy the following condition.
∂/∂t = 0
∂/∂t = constant
∂/∂s = 0
∂/∂t = constant
✅ The correct answer is option C.
5925. Foot valves are provided in the suction line of a centrifugal pump to
Avoid priming, every time we start the pump
Remove the contaminant present in the liquid
Minimise the fluctuation in discharge
Control the liquid discharge
✅ The correct answer is option A.
5926. For the same terminal conditions and fitting size, the least friction loss is incurred in a/an
T-joint
Union
45° elbow
90°bend
✅ The correct answer is option B.
5927. As per Newton’s law of viscosity, the shear stress for a given rate of angular deformation of fluid is proportional to(where, μ = fluid viscosity)
1/μ
μ
μ²
1/μ²
✅ The correct answer is option B.
5928. For a particle settling in water at its terminal settling velocity, which of the following is true?
Buoyancy = weight + drag
Weight = buoyancy + drag
Drag = buoyancy + weight
Drag = weight
✅ The correct answer is option B.
5929. In case of turbulent flow of fluid through a circular pipe, the
Mean flow velocity is about 0.5 times the maximum velocity
Velocity profile becomes flatter and flatter with increasing Reynolds number
Point of maximum instability exists at a distance of 2r/3 from the pipe wall (r = pipe radius)
Skin friction drag, shear stresses, random orientation of fluid particles and slope of velocity profile at the wall are more
✅ The correct answer is option D.
5930. Enamels and paints are generally __________ fluid.
Reheopectic
Pseudo-plastic
Thixotropic
Dilatant
✅ The correct answer is option B.