231. The inherent characteristic of an equal percentage valve relating flow rate ‘q’ with valve stem movement ‘x’ are described by the equation
dq/dx = K
dq/dx = K.q
dq/dx = K/q
dq/dx = Kq²
✅ The correct answer is option A.
Fluid Mechanics MCQs
232. Mach number is defined as the ratio of the local flow velocity to the sonic velocity in the fluid. For what value of Mach number, the gases are considered incompressible?
< 0.3
> 3
50
1
✅ The correct answer is option A.
233. A centrifugal pump loses prime after starting. The reason of this trouble may be
Incomplete priming
Too high a suction lift
Low available NPSH and air leaks in the suction pipe
All of the above
✅ The correct answer is option D.
234. The time taken for gravity flow of a fixed volume of liquid (as in Redwood viscometer) is directly proportional to its
Absolute viscosity
Ratio of absolute viscosity to density
Density
Reynolds number
✅ The correct answer is option B.
235. An ideal nozzle design aims at
Minimising wall friction
Suppressing boundary layer separation
Both A & B
Neither A nor B
✅ The correct answer is option C.
236. Slugging in a fluidised bed can be avoided by using
Tall narrow vessel
Deep bed of solids
Shallow beds of solids and proper choice of particle size
Very large particles
✅ The correct answer is option C.
237. A pressure of 10 m head of water is equivalent to __________ kN/m².
98
147
196
49
✅ The correct answer is option A.
238. Which of the following facilitates close control of flow of fluids?
Gate valve
Globe valve
Butterfly valve
Check valve
✅ The correct answer is option B.
239. To handle smaller quantity of fluid at higher discharge pressure, use a __________ pump.
Reciprocating
Centrifugal
Volute
Rotary vacuum
✅ The correct answer is option A.
240. The buoyant force acting on a floating body is dependent on the
Viscosity of the liquid
Weight of the liquid displaced
Depth of immersion of the body
Surface tension of the liquid
✅ The correct answer is option B.