661. The simple pitot tube does not measure the
Static pressure
Dynamic pressure
Velocity at the stagnation point
All of the above
✅ The correct answer is option D.
Fluid Mechanics MCQs
662. Most of the centrifugal pumps used in chemical plants are usually __________ driven.
Steam
Diesel engine
Electric motor
Gas turbine
✅ The correct answer is option C.
663. __________ pumps are a group of vacuum pumps.
Hyter
Sump
Mono
Submerged
✅ The correct answer is option A.
664. Steady flow occurs, when the
Conditions change steadily with time
Conditions are the same at the adjacent points at any instant
Conditions do not change with time at any point
Rate of the velocity change is constant
✅ The correct answer is option C.
665. Interstage coolers are provided in a multistage compressor to
Save power in compressing a given volume to a given pressure
Cool the delivered air
Achieve the exact delivery pressure
None of these
✅ The correct answer is option A.
666. What is the ratio of displacement thickness to nominal thickness for a linear distribution of velocity in the boundary layer on a flat plate?
0.5
1
1.5
2
✅ The correct answer is option A.
667. Which of the following conditions must be satisfied for lift force to be developed?
The body should be bluff body
The body should be stream lined
Circulation around the body is essentially required
The main stream velocity must approach the velocity of sound in that fluid medium
✅ The correct answer is option C.
668. Plunger pumps are used for
Higher pressure
Slurries
Viscous mass
None of these
✅ The correct answer is option A.
669. While starting a centrifugal pump, its delivery valve should be kept
Opened
Closed
Either opened or closed ; it does not make any difference
Either opened or closed; depending on the fluid viscosity
✅ The correct answer is option B.
670. Stoke’s equation is valid in the Reynolds number range
0.01 to 0.1
0.1 to 2
2 to 10
10 to 100
✅ The correct answer is option A.