Q.1

A Newtonion fluid is that

  • which follows Newton's law of motion.
    40-570-1.png
  • which needs a minimum shear, before it starts deforming.
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  • for which shear & deformation are related as
  • none of these.
Q.2

Velocity at a certain point in case of streamline flow is

  • constant
  • independent of time
  • both (a) & (b)
  • neither (a) nor (b)
Q.3

In case of venturimeters, friction losses are about __________ percent of maximum velocity head.

  • 2
  • 8
  • 12
  • 20
Q.4

A bed consists of particles of densitykg/m3. If the height of the bed is 1.5 metres and its porosity 0.the pressure drop required to fluidise the bed by air is

  • 25.61 kPa
  • 11.77 kPa
  • 14.86 kPa
  • 21.13 kPa
Q.5

If Blausius or Darcey friction factor is 'f1' then the Fanning friction factor is equal to

  • f1/4
  • 4f2
  • 2f1
  • f1/2
Q.6

The rate of change of moment of momentum represents the __________ by the fluid.

  • torque applied
  • force exerted
  • work done
  • power developed
Q.7

Sewage sludge is an example of the __________ fluid.

  • Bingham plastic
  • Newtonion
  • pseudoplastic
  • dilatent
Q.8

With increase in the schedule number of a pipe of a particular nominal size, the

  • wall thickness also increases.
  • I.D. of the pipe decreases.
  • O.D. of the pipe remains constant.
  • all (a), (b) and (c)
Q.9

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

  • Decrease in effect
  • Increase in thrust
  • Develops noise
  • Develops high pressure
Q.10

When the pipe Reynold's number isthe flow is generally

  • viscous
  • laminar
  • turbulent
  • transition
Q.11

Terminal velocity is

  • a constant velocity with no acceleration.
  • a fluctuating velocity.
  • attained after moving one-half of total distance.
  • none of these.
Q.12

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

  • d
  • d1/3
  • d2
  • d2/3
Q.13

The distance between metacentre and __________ is called metacentric height.

  • water surface
  • centre of gravity
  • centre of buoyancy
  • none of these
Q.14

Cocks are used to control

  • water
  • any liquid
  • solids
  • none of these
Q.15

Pick out the wrong statement pertaining to fluid flow.

  • The ratio of average velocity to the maximum velocity for turbulent flow of Newtonion fluid in circular pipes is 0.5.
  • The Newtonion fluid velocity in a circular pipe flow is maximum at the centre of the pipe.
  • Navier-Stokes equation is applicable to the analysis of viscous flows.
  • Hagen-Poiseuille equation is applicable to the laminar flow of Newtonion fluids.
Q.16

Cd for the orifice plate varies from

  • 0.58 to 0.8
  • 0.93 to 0.98
  • 0.2 to 0.3
  • 0.02 to 0.03
Q.17

In case of a rotameter, the density of the float material is __________ that of the liquid it replaces.

  • more than
  • less than
  • equal to
  • either (a) or (b)
Q.18

Pressure drop in packed bed for turbulent flow is given by the __________ equation.

  • Kozney-Karman
  • Blake-Plummer
  • Leva's
  • Hagen-Poiseulle's
Q.19

Non-colloidal solution is an example of the __________ fluid.

  • non-Newtonion
  • Newtonion
  • dilatent
  • pseudoplastic
Q.20

Potential function is applicable only for __________ flow.

  • irrotational
  • turbulent
  • steady
  • none of these
Q.21

Turbine impeller

  • produces only radial current.
  • produces only tangential current.
  • is effective over wide range of viscosities.
  • does not produce tangential current.
Q.22

For a specific centrifugal air blower operating at constant speed & capacity, the power requirement and pressure vary

  • directly as square of gas density.
  • directly as gas density.
  • directly as square root of gas density.
  • inversely as gas density.
Q.23

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.

  • f1 = f2
  • f1 < f2
  • f1 > f2
  • data not sufficient to relate f1 & f2
Q.24

Gradually varied flow in open channel is a/an __________ flow.

  • steady uniform
  • steady non-uniform
  • unsteady uniform
  • unsteady non-uniform
Q.25

Check valve is used for __________ flow.

  • very precise control of
  • unidirectional
  • multidirectional
  • none of these
Q.26

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.
Q.27

A Newtonion liquid (ρ = density, μ = viscosity) is flowing with velocity v in a tube of diameter 'D'. Let Δp be the pressure drop across the length 'L'. For a laminar flow, Δp is proportional to

  • L ρv2/D
  • L μ;V/D2
  • D ρv2/L
  • μ V/L
Q.28

The discharge through a V-notch weir varies as

  • H3/2
  • H1/2
  • H5/2
  • H2/3
Q.29

Multistage centrifugal pumps are generally used for

  • high head.
  • low head but high discharge.
  • highly viscous liquid.
  • slurries of high solid concentration.
Q.30

In the complete turbulence zone (in rough pipes), the

  • rough and smooth pipes have the same friction factor.
  • laminar film covers the roughness projections.
  • friction factor depends upon NRe only.
  • friction factor is independent of the relative roughness.
Q.31

Boundary layer separation is caused by the

  • reduction of pressure below vapour pressure.
  • reduction of pressure gradient to zero.
  • adverse pressure gradient.
  • reduction of boundary layer thickness to zero.
Q.32

Which of the following exemplifies a three dimensional fluid flow ?

  • Fluid flow at the inlet to a nozzle
  • Fluid flow between parallel plates
  • Viscous fluid flow between converging plates
  • None of these
Q.33

Friction produced by the formation of wakes is called the __________ friction.

  • disk
  • skin
  • form
  • none of these
Q.34

Capillary tube method of viscosity measurement is based on the

  • Hagen-Poiseulle's equation
  • Stoke's law
  • Navier-stokes equation
  • none of these
Q.35

A bed of spherical particles (specific gravity 2.of uniform sizeμm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.Ergun's equation for the above fluid-particle system (in SI units) is given below :
Δ P/L =x 103 VOM + 10.x 106 V2OM (SI units)
If water is to be used as the fluidising medium, in actual operation, the above bed has a height = 1 m. What is the porosity of the fluidised bed ?

  • 0.2
  • 0.5
  • 0.7
  • 0.8
Q.36

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

  • axial
  • reciprocating
  • rotary
  • none of these
Q.37

Hydraulic __________ works on the principle of Pascal's law of transmission of fluid pressure.

  • press
  • turbine
  • pump
  • coupling
Q.38

One poise (unit of absolute/dynamic viscosity) is equivalent to one

  • gm/cm2. sec.
  • gm/cm. sec.
  • cm2/sec.
  • m2/sec.
Q.39

With a constant diameter impeller of a centrifugal pump

  • its capacity varies directly as the square of speed.
  • head varies as the square of speed.
  • horsepower input varies as the square of speed.
  • head varies as the speed.
Q.40

Out of the following flow measuring devices, which one incurs the maximum installation cost as well as pressure loss ?

  • Flow nozzle
  • Venturimeter
  • Rotameter
  • Orificemeter
Q.41

For an incompressible fluid, the bulk modulus of elasticity is

  • 5 kg/m3
  • ∞ N/m2
  • 1 N
  • 0 N/m
Q.42

The line of action of the buoyant force acts through the

  • centroid of the displaced volume of fluid.
  • centre of gravity of a submerged body.
  • centroid of the volume of any floating body.
  • none of these.
Q.43

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), (6) and (c).
Q.44

The dimension of surface tension is

  • ML-2
  • MT-2
  • MLT-2
  • ML-2T
Q.45

While starting a centrifugal pump, its delivery valve should be kept

  • opened.
  • closed.
  • either opened or closed ; it does not make any difference.
  • either opened or closed; depending on the fluid viscosity.
Q.46

Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an

  • pitot tube
  • venturimeter
  • orificemeter
  • rotameter
Q.47

The fluid jet discharging from adiameter orifice has a diameter of 1.at its vena-contracta. The co-efficient of contraction is

  • 1.3
  • 0.766
  • 0.87
  • none of these
Q.48

Which of the following has the minimum compressibility ?

  • Water at room temperature
  • Air at room temperature
  • Oxygen at room temperature
  • Nitrogen at room temperature
Q.49

The head loss in turbulent flow in pipe is proportional to(where, V = velocity of fluid through the pipe)

  • V2
  • 1/V2
  • 1/V
  • V
Q.50

Identification of pipelines carrying different liquids and gases is done by the __________ of the pipe.

  • diameter
  • colour
  • altitude
  • none of these
0 h : 0 m : 1 s