221. For one dimensional flow of an incompressible fluid in unsteady state in x-direction, the continuity equation is given by
∂u/∂x = 0
∂(ρu)/∂x = 0
∂u/∂x = – ∂ρ/∂t
∂ρ/∂t = 0
✅ The correct answer is option A.
Fluid Mechanics MCQs
222. Fluid flow in a/an __________ is an example of pressure flow.
Partially filled pipeline
Pipe
Open channel
River
✅ The correct answer is option B.
223. Transition length for turbulent flow in smooth pipe is equal to __________ times the pipe diameter.
0.5
5
50
100
✅ The correct answer is option C.
224. Hydraulic radius of 6″ x 12″ cross-section, is __________ inches.
2
0.5
1.5
None of these
✅ The correct answer is option A.
225. Nominal Pipe Size (NPS) of a pipe less than 12 inches in diameter indicates its
Inner diameter
Outer diameter
Thickness
Neither inner nor outer diameter
✅ The correct answer is option D.
226. Flow measurement in an open channel is done by a/an
Venturimeter
Orificemeter
Weir
Rotameter
✅ The correct answer is option C.
227. Flow rate of high velocity flue gas discharged through a stack to the atmosphere can be most conveniently measured by a
Pitot tube
Manometer
Rotameter
None of these
✅ The correct answer is option A.
228. Centrifugal pumps as compared to reciprocating pumps
Run at a lower speed for the same discharge
Do not need priming
Deliver fluid with pulsating/fluctuating discharge
Can be run with discharge line valve closed for a short interval
✅ The correct answer is option D.
229. The fluid velocity varies as the cube of the cylinderical pipe diameter in case of steady state laminar flow at constant pressure drop for __________ fluid.
Newtonion
Pseudoplastic
Dilatent
Bingham plastic
✅ The correct answer is option B.
230. Two piping system are said to be equivalent, when the __________ are same.
Fluid flow rate & friction loss
Length & friction factor
Diameter & friction factor
Length & diameter
✅ The correct answer is option A.