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Q1. | In a/an __________ , the flow rate of fluids is obtained by measuring the difference between the impact and the static pressure. |

A. | rotameter [Wrong Answer] |

B. | pitot tube [Correct Answer] |

C. | venturimeter [Wrong Answer] |

D. | flow nozzle [Wrong Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ A venturimeter can not be used for the direct measurement of

datum difference in the stretch of pipeflow

pressure difference in the flow throughpipeline.

friction loss in pipe flow.

all (a), (b) and (c).

⇒ If in a flow field, between any two points, then the flow must be

steady, incompressible, irrotational.

steady, compressible, irrotational.

steady, compressible and along a streamline.

unsteady, incompressible, irrotational.

⇒ The velocity profile for a Bingham plastic fluid flowing (under laminar conditions) in a pipe is

parabolic

flat

flat near the wall and parabolic in the middle

parabolic near the wall and flat in the middle.

⇒ For the same terminal conditions and fitting size, the least friction loss is incurred in a/an

T-joint

union

45° elbow

90°bend

⇒ __________ flow means the flow of incompressible fluid with no shear.

Potential

Streamline

Creep

Boundary layer

⇒ Bernoulli's equation for fluid flow is derived following certain assumptions. Out of the assumptions listed below, which set of assumptions is used in derivation of Bernoulli's equati

A, C, D

B, D, E

A, B, E

A, D, E

⇒ It is possible to integrate an automatic flow controller to a

flow nozzle

venturimeter

rotameter

none of these

⇒ Air vessel of a reciprocating pump is initially filled with

atmospheric air

compressed air

water

none of these

⇒ The fluid in which the shearing stress within it is proportional to the velocity gradient across the sheared section, is called a __________ fluid.

Bingham

Newtonion

perfect

none of these

⇒ Diaphragm pumps are used to transport

solids

liquids

fluids

slurries

⇒ 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 __________ is measured by a piezometric opening.

dynamic pressure

static pressure

total pressure

point velocity

⇒ In an incompressible fluid, the density is

greatly affected by moderate changes in pressure.

greatly affected only by moderate changes in temperature.

not affected with moderate change in temperature & pressure.

sensible to changes in both temperature & pressure.

⇒ In case of laminar flow of fluid through a circular pipe, the

shear stress over the cross-section is proportional to the distance from the surface of the pipe.

surface of velocity distribution is a paraboloid of revolution, whose volume equals half the volume of circumscribing cylinder.

velocity profile varies hyperbolically and the shear stress remains constant over the cross-section.

average flow occurs at a radial distance of 0.5 r from the centre of the pipe (r = pipe radius).

⇒ With the increase in depth, the hydrostatic pressure in an unaccelerated incompressible fluid (in a constant gravitational field)

decreases.

increases linearly.

increases exponentially.

remains constant.

⇒ The pressure head on sudden contraction in a horizontal pipe is converted into the __________ head.

elevation

velocity

both (a) & (b)

neither (a) nor (b)

⇒ Bernoulli's equation is not applicable, when the flow is

irrotational.

incompressible.

viscous.

all (a), (b) & (c).

⇒ Propellers are

axial flow mixers.

low speed impeller.

used for mixingliquids of high viscosity.

radial flow mixers.

⇒ The unit of bulk modulus of elasticity for a liquid in S.I. unit is

N

N/m

N/m

^{2}

N/m

^{3}

⇒ In centrifugal pumps, cavitation occurs, when pressure of the impeller eye or vane becomes

less than atmospheric pressure.

more than liquid vapor pressure.

less than liquid vapor pressure.

more than atmospheric pressure.

⇒ A bed consists of particles of density 2000 kg/m

^{3}. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is

25.61 kPa

11.77 kPa

14.86 kPa

21.13 kPa

⇒ Fluidised beds are formed, when the

fluid friction is zero

gravity force is less than the fluid friction.

pressure forces equal gravity forces.

sum of the fluid friction and pressure forces is equal and opposite to gravity forces.

⇒ Mach number is the ratio of the speed of the

fluid to that of the light.

light to that of the fluid.

fluid to that of the sound.

sound to that of the fluid.

⇒ A rotameter through which air at room temperature and atmospheric pressure is flowing gives a certain reading for a flow rate of 100 cc/sec. If helium (molecular weight 4) is used and rotameter shows the same reading, the flow rate (cc/sec) is

26

42

269

325

⇒ In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of

relative roughness.

absolute roughness.

friction co-efficient for flows at equal Reynold number.

all (a), (b) & (c).

⇒ In deriving Bernoulli's equation, fluid is assumed to be

incompressible, frictionless, steady, along a streamline.

uniform, steady, incompressible, along a streamline.

steady, density being pressure dependent, frictionless.

none of these.

⇒ The ratio of width to depth for the most economical rectangular section in open channel flow is

0.5

1

1.5

2

⇒ What is the speed of sound (m/sec) in ordinary water ?

1500

330

1000

3000

⇒ Pick out the wrong statement.

A fluid mass is free from shearing forces, when it is made to rotate with a uniform velocity.

Newton's law of viscosity is not applicable to the turbulent flow of fluid with linear velocity distribution.

Laminar flow of viscous liquids is involved in the lubrication of various types of bearings.

Rise of water in capillary tubes reduces with the increasing diameter of capillary tubes.

⇒ For very low pressure and high discharge rate, the compressor used is a/an __________ compressor.

axial

reciprocating

rotary

none of these