691. A rotameter works on the principle of __________ pressure drop.
Constant
Variable
Both A & B
Neither A nor B
✅ The correct answer is option A.
Fluid Mechanics MCQs
692. The valve commonly used in pipes larger than 2″ dia is a
Globe valve
Plug-cock
Gate valve
Check valve
✅ The correct answer is option C.
693. Laminar flow is characterised by the nonexistence of
Pressure fluctuation
Eddies
Deviating velocities
All of the above
✅ The correct answer is option D.
694. The continuity equation of fluid mechanics utilises the principle of conservation of
Momentum
Mass
Energy
Both B & C
✅ The correct answer is option B.
695. In turbulent flow, the
Fluid particles move in an orderly manner
Momentum transfer is on molecular scale only
Shear stress is caused more effectively by cohesion than momentum transfer
Shear stresses are generally larger than in a similar laminar flow
✅ The correct answer is option D.
696. Stoke’s law is valid, when the particle Reynolds number is
< 1
> 1
< 5
None of these
✅ The correct answer is option A.
697. Which of the following has the minimum compressibility?
Water at room temperature
Air at room temperature
Oxygen at room temperature
Nitrogen at room temperature
✅ The correct answer is option A.
698. The capacity of an accumulator is the maximum
Energy which it can store
Discharge which it can deliver
Liquid which it can store
None of these
✅ The correct answer is option A.
699. If Blausius or Darcey friction factor is ‘f₁’ then the Fanning friction factor is equal to
f₁/4
4F₂
2f₁
f₁/2
✅ The correct answer is option A.
700. If the head over the triangular notch is doubled, the discharge will increase by __________ times.
2
2.828
5.657
4
✅ The correct answer is option C.