20 m/sec
10 m/sec
5√2 m/sec
5 m/sec
✅ The correct answer is option B.
Fluid Mechanics MCQs
With a constant diameter impeller of a centrifugal pump
Its capacity varies directly as the square of speed
Head varies as the square of speed
Horsepower input varies as the square of speed
Head varies as the speed
✅ The correct answer is option B.
In Newton’s law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the __________ of its diameter.
Inverse
Square root
Second power
First power
✅ The correct answer is option B.
The equivalent diameter for fluid flow through square cross section channel of side ‘x’, for pressure drop calculation purpose is given by
4x
2x
x
√x
✅ The correct answer is option C.
In isotropic turbulence, the __________ are equal to each other.
Temporal velocity components
Mean square of velocity fluctuations in the three co-ordinate directions
Root mean square of velocity fluctuations in the three co-ordinate directions
None of these
✅ The correct answer is option B.
Assuming flow to be laminar, if the diameter of the pipe is halved, then the pressure drop will
Increase
Decrease
Remain same
Be quadrupled
✅ The correct answer is option A.
Air vessel of a reciprocating pump is initially filled with
Atmospheric air
Compressed air
Water
None of these
✅ The correct answer is option B.
Pressure drag does not depend upon the
Roughness of surface of the body
Pressure of main flow only
Length of the body in flow direction
All of the above
✅ The correct answer is option D.
Isothermal turbulent flow of a fluid results in decrease of its pressure, which depends on the
Wall roughness
Reynolds number
Both A and B
Neither A nor B
✅ The correct answer is option C.
The discharge through a venturimeter depends upon
Pressure drop only
Its orientation
Co-efficient of contraction only
None of these
✅ The correct answer is option A.