551. In frictional fluid flow, the quantity, P/ρ + V²/2gc + gz/gc, is
Constant along a streamline
Not constant along a streamline
Increased in the direction of flow
None of these
✅ The correct answer is option B.
Fluid Mechanics MCQs
552. Out of the following flow measuring devices, which one incurs the maximum installation cost as well as pressure loss?
Flow nozzle
Venturimeter
Rotameter
Orificemeter
✅ The correct answer is option B.
553. Power requirement of fans having constant wheel diameter varies __________ fan speed.
As square of
Directly as
As cube of
None of these
✅ The correct answer is option C.
554. Location of vena-contracta in an orificemeter does not depend upon the
Type of orifice
Density, viscosity & compressibility of the fluid
Ratio of pipe diameter to orifice diameter
Pipe roughness
✅ The correct answer is option A.
555. The boundary layer thickness at a given section along a flat plate __________ with increasing Reynold’s number.
Increases
Decreases
Remains same
May increase or decrease
✅ The correct answer is option B.
556. One poise (unit of absolute/dynamic viscosity) is equivalent to one
Gm/cm². sec
Gm/cm. sec
Cm²/sec
M²/sec
✅ The correct answer is option B.
557. Centrifugal compressors compared to reciprocating compressors
Require less space
Have quieter operation
Have lower operating costs
All of the above
✅ The correct answer is option D.
558. A pitched-blade turbine draws __________ a straight blade turbine.
Less power than
More power than
Same power as
Data insufficient to predict
✅ The correct answer is option A.
559. Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the
Back flow of fluid in the event of stoppage of pump
Discharge pressure
Flow of liquid during operation of the pump
All of the above
✅ The correct answer is option A.
560. Which of the following is not an advantage of fluidisation from transfer operation point of view?
Intimate contact of the fluid with all parts of the solid particles
Lower fluid pumping power requirement
Minimisation of temperature variation
Prevention of particle seggregation
✅ The correct answer is option B.