Fluid Mechanics for Chemical Quiz 3

1 / 50

Capacity of a hydraulic accumulator is defined in terms of maximum_______?

Rate of falling of ram

Amount of energy stored

Volume available in the cylinder

Flow rate through accumulator

2 / 50

Check valves are used________?

For unidirectional flow

In bends

At high pressure

For controlling water flow

3 / 50

Cavitation occurs in a centrifugal pump when the suction pressure is_________?

Equal to the vapour pressure

Greater than the vapour pressure of the liquid at that temperature

Less than the vapour pressure of the liquid at that temperature

Equal to the developed head

4 / 50

Dimension of kinematic viscosity is_______?

MLT-1

L2T-2

L2T

L2T-1

5 / 50

Disc compensators are provided in large diameter fuel gas carrying pipelines to__________?

Keep the pipe in proper orientation

Account for contraction/expansion of pipe due to temperature changes of the surroundings

Make the pipe joint leak-proof

Account for the pressure variation side the pipeline

6 / 50

Curve III in the bellow diagram represents a/an_________?

Dilatent fluid

Ideal plastic

None of these

Pseudo plastic fluid

7 / 50

Brownian movement is prominent in the particle size range of ______ microns in case of settling of a particle in a fluid?

100 to 1000

0.01 to 0.10

2 to 3

200 to 300

8 / 50

Creeping flow around a sphere is defined, when particle Reynolds number is_____?

> 2.5

< 500

< 2100

< 0.1

9 / 50

Choose the correct set of dimensions of viscosity that are equivalent (where, F, M, L, T are dimensions for force, mass, length and time respectively) ?

FLT, ML-1T-1

F-1L2T-1, MLT-3

ML-1T-3, F-1L2T

FL-2T, ML-1T-1

10 / 50

Centrifugal pump can?t be used to pump _______?

Thick molten soap at 80?C

Molten sodium (used as a coolant in Fast Breeder Reactor)

None of the above

Moderately viscous vegetable oil used in soap industry

11 / 50

Cocks are used to control _____?

Any liquid

None of these

Solids

Water

12 / 50

Check in a centrifugal pump is_________?

Provided in the discharge line

Generally a globe valve

Provided to prevent liquid from backing up through the pump when the pump is turned off or accidently stops running

All A., B. and C.

13 / 50

Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, ? = surface tension of mercury)______?

1/?

1/d

14 / 50

Cd for the orifice plate varies from _____?

0.02 to 0.03

0.58 to 0.8

0.93 to 0.98

0.2 to 0.3

15 / 50

Cp/Cv is termed as___________?

Weber number

Mach number

Prandtl number

Adiabatic constant

16 / 50

Centrifugal pumps as compared to reciprocating pumps___________?

Deliver fluid with pulsating/fluctuating discharge

Do not need priming

Can be run with discharge line valve closed for a short interval

Run at a lower speed for the same discharge

17 / 50

Boundary layer thickness in turbulent flow over a flat plate increases as(where, d = distance from the leading edge.) ?

d1/3

d4/5

d2/3

18 / 50

Co-efficient of discharge (Cd) is defined as actual discharge/theoretical discharge and is equal to Cc . Cv; where Cc = Co-efficient of contraction and Cv = co-efficient of velocity. Cd of an orifice is usually about___________?

0.98

0.62

0.82

0.42

19 / 50

Diaphragm pumps are used to transport__________?

Fluids

Solids

Slurries

Liquids

20 / 50

Design of the casing of centrifugal pump should be such as to minimise the_________?

Loss of static head

Back flow through impeller

Loss of kinetic head

None of these

21 / 50

Dean number is concerned with the______?

Fluid-particle interaction

Psychrometry

Power consumption in agitated vessels

Fluid flow through helical pipes

22 / 50

Boundary layer separation occurs when the______?

Cross-section of the channel is reduced

Velocity of sound is reached

Valve is closed in a pipeline

Pressure reaches a minimum

23 / 50

Buckingham-? theorem states that in any physical problem including ?n? quantities having ?m? dimensions, the quantities can be arranged into ______ independent dimensionless parameters?

n/m

n-m

24 / 50

Capacity of a rotary gear pump can be varied by___________?

Changing the speed of rotation

Bleeding air into suction

Bypassing liquid from the suction or discharge line

All A., B. and C.

25 / 50

Capillary tube method of viscosity measurement is based on the _________?

None of these

Navier-stokes equation

Stoke?s law

Hagen-Poiseuille?s equation

26 / 50

Check valve is used for _________ flow?

None of these

Very precise control of

Unidirectional

Multidirectional

27 / 50

Diaphragm valves are used for handling ________ fluids?

Solid suspended

Viscous

Corrosive

Non-Newtonian

28 / 50

Consider two pipes of same length and diameter through which water is passed at the same velocity. The friction factor for rough pipe is f1 and that for smooth pipe is f2. Pick out the correct statement ?

Data not sufficient to relate f1 & f2

f1 > f2

f1 < f2

f1 = f2

29 / 50

Centrifugal pump is normally classified on the basis of the_________?

Impeller blade angle

Number of blades in impeller

Type of casing

rpm

30 / 50

Dimension of absolute viscosity is__________?

MLT

MLT-1

ML-1T

ML-1T-1

31 / 50

Choose the set of pressure intensities that are equivalent ?

4.33 psi, 10 ft. of water, 8.83 inches of Hg

10 psi, 19.7 ft. of water, 23.3 inches of Hg

4.33 psi, 10 ft. of water, 20.7 inches of Hg

10 psi, 19.7 ft. of water, 5.3 inches of Hg

32 / 50

Critical velocity in a pipe flow__________?

Increases as fluid viscosity increases

Independent of fluid density

None of these

Increases as pipe diameter increases

33 / 50

Check valve provided in the discharge line of a centrifugal pump serves the purpose of controlling the________?

All A., B. and C.

Back flow of fluid in the event of stoppage of pump

Discharge pressure

Flow of liquid during operation of the pump

34 / 50

Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation ?

Increase in thrust

Develops high pressure

Decrease in effect

Develops noise

35 / 50

Dimension of surface tension is (where, F = force, L = length) ?

F-1. L

F.L-2

F-2. L

FL-1

36 / 50

Differential manometer measures the_____?

Absolute pressure

Gauge pressure

Pressure difference

Pressure gradient

37 / 50

Cavitation in a centrifugal pump can be avoided by keeping the___________?

Inlet pressure low

Outlet pressure high

Inlet pressure high

Outlet pressure low

38 / 50

Buoyant force___________?

Depends on the depth of the submergence of the floating body

Depends on the weight of the floating body

None of these

For non-symmetrical bodies is not vertical

39 / 50

Cavitation can be prevented by_________?

Maintaining suction head = developed head

Maintaining suction head lower than the vapour pressure

Maintaining the suction head sufficiently greater than the vapour pressure

Suitably designing the pump

40 / 50

Centre of pressure of a plane surface of arbitrary shape immersed vertically in a static mass of fluid_________?

Is different for different fluids

Is independent of the specific weight of the fluid

Lies above the centroid of the plane surface

Is at the centroid of the plane surface

41 / 50

Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the ________ decreases?

BHP required by the pump

All A., B. and C.

Head of the liquid pumped

NPSH required

42 / 50

Co-efficient of velocity is _____ the coefficient of discharge?

Equal to

More than

Less than

Not related to

43 / 50

Choking in case of pipe flow means that a_____?

Restriction in flow cross-section area occurs

Specified mass flow rate cannot be achieved

None of these

Valve is closed in the line

44 / 50

Colebrook equation for friction factor in turbulent flow is given by, f-0.5 = -4 loge [(?/D) + (1.26/NRe ?F). It reduces to Nikuradse equation for a value of (?/D) equal to ___________?

0.5

45 / 50

Deformation drag, which is caused by widespread deformation of fluid around the immersed body______?

Occurs when NRe is very small

Is primarily a friction drag

Depends mainly on cross-sectional shape

Is independent of body length

46 / 50

Differential manometer measures the______?

Pressure difference between two points

Sub-atmospheric pressure

None of these

Atmospheric pressure

47 / 50

Boundary layer thickness in laminar flow over a flat plate increases as(where, d = distance from the leading edge.) ?

d1/3

d2/3

48 / 50

Centrifugal compressors compared to reciprocating compressors___________?

Require less space

All A., B. and C.

Have quieter operation

Have lower operating costs

49 / 50

Cd is always _______ Cc?

Equal to

Either more or less than

Less than

Greater than

50 / 50

Centre of pressure in an immersed body is _______ the centre of gravity?

Below

Above

Either above or below; depends on the liquid density

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