Suitably designing the pump
Maintaining the suction head sufficiently greater than the vapour pressure
Maintaining suction head = developed head
Maintaining suction head lower than the vapour pressure
✅ The correct answer is option B.
Fluid Mechanics MCQs
Deformation drag, which is caused by widespread deformation of fluid around the immersed body
Occurs when NRe is very small
Is primarily a friction drag
Is independent of body length
Depends mainly on cross-sectional shape
✅ The correct answer is option A.
With increase in pump speed, its NPSH requirement
Decreases
Increases
Remains unaltered
Can either increase or decrease ; depends on other factors
✅ The correct answer is option B.
For the free settling of a spherical particle through a fluid, the slope of, CD-log NRe , plot is
1
-1
0.5
-0.5
✅ The correct answer is option B.
When the momentum of one fluid is used for moving another fluid, such a device is called a/an
Jet pump
Blower
Acid egg
None of these
✅ The correct answer is option A.
Weber number is the ratio of inertial force to __________ force.
Surface tension
Gravity
Viscous
Elastic
✅ The correct answer is option A.
For water, when the pressure increases, the viscosity
Also increases
Decreases
Remains constant
First decreases, and then increases
✅ The correct answer is option D.
For pipes that must be broken at intervals for maintenance, the connector used should be a/an
Union
Tee
Reducer
Elbow
✅ The correct answer is option A.
The ratio of inertial forces to gravity forces is called the __________ number.
Mach
Froude
Euler
Weber
✅ The correct answer is option B.
Boundary layer exists in flow
Of real fluids
Over flat surfaces only
In pipes only
Of ideal fluids only
✅ The correct answer is option A.