Protect the pump against developing excessive pressure
Facilitate unidirectional flow of liquid
Reduce the discharge pressure
Control the rate of discharge
✅ The correct answer is option A.
Fluid Mechanics MCQs
632. The capacity of a centrifugal pump Can be increased by increasing the
Impeller diameter or speed
Number of pumps and joining them in series
Number of pumps and joining them in parallel
All of the above
✅ The correct answer is option D.
633. In parallel pipe problems, the
Head loss is the same through each pipe
Discharge is the same through all the pipes
Total head loss is equal to the sum of the head losses through each pipe
None of these
✅ The correct answer is option A.
634. The pipe wall thickness is minimum for a pipe of given nominal size having schedule number
160
120
80
40
✅ The correct answer is option D.
635. The maximum delivery pressure of compressors can be upto __________ atmospheres.
10
100
250
1000
✅ The correct answer is option D.
636. Glass pipes can be joined by
Flanges
Welding
Soldering
Bell and spigot joint
✅ The correct answer is option D.
637. Which of the fluid forces are not considered in the Reynold’s equation of flow?
Viscous forces
Turbulent forces
Pressure forces
Compressibility forces
✅ The correct answer is option D.
638. Two dimensional stream function
Relates velocity and pressure
Is constant along a stream line
Is constant along an equipotential surface
None of these
✅ The correct answer is option B.
639. The equation relating friction factor to Reynold number, f-0.5 = 4 loge (NRe/√f)-0.4, is called the __________ equation.
Nikuradse
Von-Karman
Blausius
Colebrook
✅ The correct answer is option A.
640. Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg.
1
0.1
0.01
0.001
✅ The correct answer is option C.