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Fluid Mechanics > section 2 > Flashcards

section 2 Flashcards

1
Q
  1. Two dimensional stream function
    a. relates velocity and pressure.
    b. is constant along a stream line.
    c. is constant along an equipotential surface.
    d. none of these
A

b

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2
Q

What causes cavitation in centrifugal pump ?
a. High suction pressure
b. Low barometric pressure
c. Low suction pressure
d. High suction velocity

A

c

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3
Q

Draining of shallow pits or sump is done by a sump pump, which is a __________ pump.
a. single stage vertical
b. centrifugal
c. plunger
d. diffuser

A

a

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3
Q

The ratio of average fluid velocity to the maximum velocity in case of laminar flow of a Newtonion fluid in a circular pipe is
a. 0.5
b. 1
c. 2
d. 0.66

A

a

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3
Q

A hydraulic ram acts as a/an __________ pump.
a. centrifugal
b. reciprocating
c. impulse
d. parallel cylinder

A

c

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4
Q

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).
a. FL-2T, ML-1T-1
b. FLT, ML-1T-1
c. ML-1T-3, F-1L2T
d. F-1L2T-1, MLT-3

A

a

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5
Q

The line of action of the buoyant force passes through the centre of gravity of the
a. submerged body.
b. displaced volume of the fluid.
c. volume of fluid vertically above the body.
d. horizontal projection of the body.

A

b

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6
Q

Pick out the wrong statement.
a. The shear stress at the pipe (dia = D, length = L) wall in case of laminar flow of Newtonion fluids is

b. In the equation, the value of ‘n’ for pseudoplastic and dilatant fluids are < 1 and >1 respectively.

c. Shear stress for Newtonion fluid is proportional to the rate of shear in the direction perpendicular to motion.

d. With increase in the Mach number >0.6, the drag co-efficient decreases in case of compressible fluids.

A

d

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6
Q

The friction factor for turbulent flow in a hydraulically smooth pipe
a. depends only on Reynolds number.
b. does not depend on Reynolds number.
c. depends on the roughness.
d. none of these.

A

a

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7
Q

The pressure at a point in a fluid is not the same in all directions, when the fluid is viscous and
a. moving
b. static
c. cold
d. hot

A

a

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8
Q

What causes convective acceleration in fluid flow ?
a. Steep slope in flow
b. Unsteady nature of flow
c. Non-uniformity of flow
d. Turbulence in flow

A

c

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9
Q

The Stoke’s stream function applies to the
a. irrotational flow only.
b. ideal/non-viscous fluids only.
c. cases of axial symmetry.
d. none of these.

A

c

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10
Q

Slugging in a fluidised bed can be avoided by using
a. tall narrow vessel.
b. deep bed of solids.
c. shallow beds of solids and proper choice of particle size.
d. very large particles.

A

c

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11
Q

The ratio of width to depth for the most economical rectangular section in open channel flow is
a. 0.5
b. 1
c. 1.5
d. 2

A

d

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12
Q

The simple pitot tube measures the __________ pressure.
a. static
b. dynamic
c. total
d. none of these

A

c

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13
Q

Capacity of a hydraulic accumulator is defined in terms of maximum
a. amount of energy stored.
b. flow rate through accumulator.
c. rate of falling of ram.
d. volume available in the cylinder.

A

a

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14
Q

WORD FILE

A
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15
Q

With diminishing cross-sectional area in case of subsonic flow in a converging nozzle, the
A. velocity increases
b. pressure decreases
c. both (a) & (b)
d. neither (a) nor (b)

A

C

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16
Q

Boundary layer separation is characterised by one of the conditions given below, where ‘Re’ is the Reynolds number for the flow. Select the appropriate conditions.
a. Re &laquo_space;1, accelerating flow
b. Re&raquo_space; 1, accelerating flow
c. Re &laquo_space;1, decelerating flow
d. Re&raquo_space;1, decelerating flow

A

d

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17
Q

Manometers measure the __________ pressure.
a. vacuum as well as the
b. atmospheric
c. difference in
d. absolute gage

A

b

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18
Q

Which of the following fluid forces are not considered in the Navier-Stoke’s equation?
a. Gravity forces
b. Viscous forces
c. Pressure forces
d. Turbulent forces

A

d

19
Q

Which of the following may be termed as a variable orifice flowmeter ?
a. Rotameter
b. Pitot tube
c. V-notch
d. All (a), (b) and (c)

A

a

20
Q

In turbulent flow, a rough pipe has the same friction factor as a smooth pipe
a. in the zone of complete turbulence.
b. when the roughness projections are much smaller than the thickness of the laminar film.
c. everywhere in the transition zone.
d. when the friction factor is independent of the Reynold’s number.

A

b

21
Q

Air vessel provided in a reciprocating pump
a. smoothens the flow by avoiding pulsations.
b. increases the volumetric efficiency of the pump.
c. saves the pump from the danger of cavitation.
d. none of these.

A

d

22
Q

Bernoulli’s equation is dependent on the
a. first law of thermodynamics.
b. third law of thermodynamics.
c. law of conservation of momentum.
d. none of these.

A

d

23
Q

The capacity of an accumulator is the maximum
a. energy which it can store.
b. discharge which it can deliver.
c. liquid which it can store.
d. none of these.

A

a

24
Q

With increase in the temperature, viscosity of a liquid
a. increases
b. decreases
c. remains constant
d. may increase or decrease; depends on the liquid

A

b

25
Q

Vena-contracta pressure tapping is at a distance __________ from the position of an orificemeter fitted in a pipe of internal diameter ‘d’
a. d
b. 0.5 d
c. 2d
d. 4d

A

b

26
Q

The pump impeller and the turbine runner in a hydraulic torque converter
a. have the same diameter.
b. have different diameters.
c. are directly coupled.
d. none of these.

A

b

27
Q

Reciprocating pumps compared to centrifugal pumps
a. deliver liquid at uniform pressure.
b. can handle slurries more efficiently.
c. are not subject to air binding.
d. can be operated with delivery valve closed.

A

c

28
Q

The fluid property which matters for fall-ing rain drops to acquire spherical shape is its
a. pressure
b. height of descend
c. viscosity
d. surface tension

A

d

29
Q

The simple pitot tube does not measure the
a. static pressure.
b. dynamic pressure.
c. velocity at the stagnation point.
d. all (a), (b) and (c).

A

d

30
Q

Boundary layer separation occurs when the
a. pressure reaches a minimum.
b. cross-section of the channel is reduced.
c. valve is closed in a pipeline.
d. velocity of sound is reached.

A

b

31
Q

The head loss in turbulent flow in a pipe varies
a. directly as the velocity.
b. inversely as the square of the velocity.
c. approximately as the square of the velocity.
d. inversely as the square of the diameter.

A

c

32
Q

For flow through an orifice from a reservoir, the actual velocity at the vena con-tracta is given by
a. sqrt 2gh
b. C.V.sqrt 2gh
c. Cd sqrt2gh
d. Ccsqrt 2gh

A

b

33
Q

The ratio of the hydraulic radius to the diameter of the channel, for maximum mean velocity of flow in a circular channel, in open channel flow is
a. 0.3
b. 0.9
c. 0.03
d. 0.66

A

a

34
Q

For the free settling of a spherical particle through a fluid, the slope of, CD-log NRe , plot is
a. 1
b. -1
c. 0.5
d. -0.5

A

b

35
Q

A centrifugal pump loses prime after starting. The reason of this trouble may be
a. incomplete priming.
b. too high a suction lift.
c. low available NPSH and air leaks in the suction pipe.
d. all (a), (b), and (c).

A

d

36
Q

Venturimeter and orificemeter measures the __________ of the fluid.
a. pressure
b. maximum velocity
c. average velocity
d. point velocity

A

c

37
Q

Surge tanks are provided in high pressure water pipelines to
a. store a definte quantity ofwater all the time,
b. reduce the water hammer.
c. facilitate easy dismantling of pipeline for cleaning and maintenance.
d. none of these.

A

b

38
Q

Working principle of manometer comprises of balancing a coloumn of liquid against the pressure to be measured. Inclined tube manometer is especially used for the measurement of __________ pressure.
a. small differential
b. atmospheric
c. absolute
d. gage

A

a

39
Q

Isotropic turbulence occurs
a. where there is no velocity gradient.
b, at higher temperatures.
c. only in Newtonion fluids.
d. none of these.

A

a

40
Q

The co-efficient of drag and lift for an incompressible fluid depends on the
a. Reynolds number
b. Froude number
c. Mach number
d. all (a), (b) and (c)

A

a

41
Q

Euler’s equation of motion states, that at every point, the
a. fluid momentum is constant.
b. force per unit mass equals acceleration.
c. rate of mass outflow is equal to the rate of mass inflow.
d. none of these.

A

b

42
Q

The Navier-Stokes equation deals with the law of conservation of
a. mass
b. energy
c, both (a) & (b)
d. momentum

A

d

43
Q

Hydraulic intensifier is used for increasing the
a. rate of velocity of liquid supply.
b. rate of flow through delivery pipeline of a pump.
c. intensity of pressure of the liquid.
d. momentum rate through delivery pipe.

A

c

44
Q

word file

A
45
Q

Hydrometer measures the specific gravity of liquids based on the principles of buoyancy. Pycnometer is used to measure the specific gravity of
a. powder & grannular solids
b. liquids
c. low melting point semi-solids
d. all ‘a’, ‘b’ & ‘c’

A

d

46
Q

Euler’s equation of motion is a statement expressing
a. conservation of mass.
b. conservation of energy.
c. Newton’s first law of motion.
d. Newton’s second law of motion.

A

a

47
Q

During ageing of fluid carrying pipes, the
a. pipe becomes smoother with use.
b. friction factor increases linearly with time.
c. absolute roughness decreases with time.
d. absolute roughness increases linearly with time.

A

d

Fluid Mechanics (4 decks)

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