Questions and answers for exam Preparation

MCQs

Total Questions : 3218 | Page 321 of 322 pages

Question 3201. A globe valve is the most suitable for applications, in which____________________?

Fluid flow control is required
Fluid contains dispersed solid particles
Valve is required to be either fully open or fully closed
One way flow is required

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Answer: Option A. -> Fluid flow control is required
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3202. Pick out the correct statement?

Fanning friction factor is inversely proportional to Reynolds number always
The property of a randomly packed bed (with raschig rings) is given by the ratio of the total volume to the volume of voids in the bed
Mach number in an incompressible fluid is always unity
Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under conditions of flow

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Answer: Option D. -> Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under conditions of flow
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3203. Pick out the wrong statement?

The vacuum pressure is always the negative gauge pressure
The pressure of the liquid measured by a piezometer tube is the gauge pressure
Manometric liquid should have high surface tension
The point at which the resultant pressure on an immersed surface acts, is known as the centre of gravity

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Answer: Option D. -> The point at which the resultant pressure on an immersed surface acts, is known as the centre of gravity
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3204. Pick out the correct statement pertaining to the flow through a converging-diverging tube ?

The value of Mach number is always unity at the throat
No shock wave develops in the tube when the Mach number at exit is greater than unity
Throughout the converging portion of the tube, the density increases in the downstream direction
None of these

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Answer: Option B. -> No shock wave develops in the tube when the Mach number at exit is greater than unity
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3205. Pick out the wrong statement?

The shear stress at the pipe (dia = D, length = L) wall in case of laminar flow of Newtonian fluids is (D/4L). Δp
In the equation, T. gc = k. (du/dy)n the value of ‘n’ for pseudoplastic and Dilatant fluid are 1 respectively
Shear stress for Newtonian fluid is proportional to the rate of shear in the direction perpendicular to motion
With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids

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Answer: Option D. -> With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3206. Pick out the wrong statement ?

In a static mass of liquid, the pressure at a point is the same for all liquids
Pressure decreases exponentially with elevation in an isothermal atmosphere
Atmospheric pressure = absolute pressure ‒ gage pressure
As per Pascal’s law, the pressure at a point in a static or uniformly moving fluid is equal in all directions

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Answer: Option A. -> In a static mass of liquid, the pressure at a point is the same for all liquids
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3207. Pick out the wrong statement?

Greater is the kinematic viscosity of the liquid, greater is the thickness of the boundary layer
Blowers develop a maximum pressure of 2 atmospheres
Friction losses in pipe fittings are generally expressed in terms of velocity heads
Fanning friction factor in case of turbulent flow of liquids in pipe depends upon relative roughness & Reynolds number

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Answer: Option C. -> Friction losses in pipe fittings are generally expressed in terms of velocity heads
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3208. Pick out the wrong statement ?

Momentum transfer in laminar flow results from velocity gradient
A fluid in equilibrium is not free from shear stress
The viscosity of a non-Newtonian fluid is a function of temperature only
Both B. and C.

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Answer: Option D. -> Both B. and C.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3209. Select the correct statement?

The discharge through a Venturimeter depends upon Δp only and is independent of orientation of the meter
A Venturimeter with a given gage difference discharges at a greater rate, when the flow is vertically downward through it, than when the flow is verti
For a given pressure difference, the discharge of gas is greater through a Venturimeter, when compressibility is taken into account, than when it is n
The overall pressure loss is the same in a given pipe line, whether a Venturimeter or a nozzle with the same throat dia is used

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Answer: Option A. -> The discharge through a Venturimeter depends upon Δp only and is independent of orientation of the meter
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3210. Select the wrong statement pertaining to flow of an incompressible fluid through a Venturimeter ?

For frictionless flow, the fluid pressure entering the venturi meter will be exactly equal to that leaving the Venturimeter
Discharge of fluid through a Venturimeter depends upon the gage difference irrespective of the orientation of Venturimeter
Venturimeter occupies less space than an orificemeter
Venturimeter incurs less power loss compared to an equivalent orificemeter

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Answer: Option C. -> Venturimeter occupies less space than an orificemeter
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!