Q.1

Which of the following is not concerned with the fluid-particle interaction ?

  • Drag co-efficient
  • Froude number
  • Galileo number
  • Weber number
Q.2

The resistance wire used in a hot wire anemometer for conducting electrical current is made of

  • copper
  • tungsten
  • chromium
  • aluminium
Q.3

For the free settling of a spherical particle through a fluid, the slope of, CD-log NRe , plot is

  • 1
  • -1
  • 0.5
  • -0.5
Q.4

Most commonly used joint in the underground pipe lines is the

  • sleevejoint
  • coupling
  • flange
  • expansion joint
Q.5

Molten soap mass is transported by a __________ pump.

  • diaphragm
  • reciprocating
  • gear
  • centrifugal
Q.6

The ratio of the depth of flow to the hydraulic radius for the most economical trapezoidal section, in open channel flow is

  • 0.5
  • 1
  • 1.5
  • 2
Q.7

Dimension of absolute viscosity is

  • ML-1T-1
  • MLT-1
  • ML-1T
  • MLT
Q.8

The fluid property which matters for fall-ing rain drops to acquire spherical shape is its

  • pressure
  • height of descend
  • viscosity
  • surface tension
Q.9

Which of the following fluid forces are not considered in the Navier-Stoke's equation?

  • Gravity forces
  • Viscous forces
  • Pressure forces
  • Turbulent forces
Q.10

What causes convective acceleration in fluid flow ?

  • Steep slope in flow
  • Unsteady nature of flow
  • Non-uniformity of flow
  • Turbulence in flow
Q.11

The terminal velocity of a small sphere settling in a viscous fluid varies as the

  • first power of its dimeter.
  • inverse of the fluid viscosity.
  • inverse square of the diameter.
  • square of the difference in specific weights of solid & fluid.
Q.12

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.

  • small differential
  • atmospheric
  • absolute
  • gage
Q.13

At high Reynolds number

  • inertial forces are unimportant and viscous forces control.
  • inertial forces control and viscous forces are unimportant.
  • viscous forces predominate.
  • none of these.
Q.14

Pick out the correct statement.

  • A forced vortex occurs when fluid rotates as a solid about an axis.
  • In laminar flow, Newton's law of viscosity does not apply.
  • A free vortex occurs, when fluidrotates as a solid.
  • In turbulent flow, there are neither cross-currents nor eddies.
Q.15

Maximum theoretical suction lift for water at 15°C by a centrifugal pump isft. The same for water at 90°C will be __________ ft.

  • 40
  • 34
  • 8
  • 37
Q.16

With diminishing cross-sectional area in case of subsonic flow in a converging nozzle, the

  • velocity increases
  • pressure decreases
  • both (a) & (b)
  • neither (a) nor (b)
Q.17

A centrifugal pump loses prime after starting. The reason of this trouble may be

  • incomplete priming.
  • too high a suction lift.
  • low available NPSH and air leaks in the suction pipe.
  • all (a), (b), and (c).
Q.18

Schedule number of a pipe, which is a measure of its wall thickness, is given by

  • 1000 P'/S
  • 100 P'/S
  • 1000 S/P'
  • 10000 P'/S
Q.19

__________ pumps are axial flow pumps.

  • Turbine
  • Propeller
  • Diffuser
  • none of these
Q.20

The simple pitot tube does not measure the

  • static pressure.
  • dynamic pressure.
  • velocity at the stagnation point.
  • all (a), (b) and (c).
Q.21

Which of the following may be termed as a variable orifice flowmeter ?

  • Rotameter
  • Pitot tube
  • V-notch
  • All (a), (b) and (c)
Q.22

The Stoke's stream function applies to the

  • irrotational flow only.
  • ideal/non-viscous fluids only.
  • cases of axial symmetry.
  • none of these.
Q.23

If the discharge of a centrifugal pump is throttled, then its suction lift

  • increases
  • decreases
  • remains unchanged
  • data insufficient to predict
Q.24

Isotropic turbulence occurs

  • where there is no velocity gradient.
  • at higher temperatures.
  • only in Newtonion fluids.
  • none of these.
Q.25

Power loss in an orificemeter is __________ that in a venturimeter.

  • less than
  • same as
  • more than
  • data insufficient, cannot be predicted
Q.26

The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10-6m2/s).

  • 24000
  • 24
  • 0.24
  • 0.44
Q.27

The fluid property, due to which, mercury does not wet the glass is

  • surface tension
  • viscosity
  • cohesion
  • adhesion
Q.28

Velocity distribution for flow between two fixed parallel plates

  • varies parabolically across the section.
  • is constant over the entire cross-section.
  • is zero at the plates and increases linearly to the midplane.
  • none of these.
Q.29

Shear stress in a fluid flowing in a round pipe

  • varies parabolically across the cross-section.
  • remains constant over the cross-section.
  • is zero at the centre and varies linearly with the radius.
  • is zero at the wall and increases linearly to the centre.
Q.30

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.

  • Re << 1, accelerating flow
  • Re >> 1, accelerating flow
  • Re << 1, decelerating flow
  • Re >>1, decelerating flow
Q.31

Venturimeter and orificemeter measures the __________ of the fluid.

  • pressure
  • maximum velocity
  • average velocity
  • point velocity
Q.32

The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of the velocity head and the pressure head at the

  • discharge.
  • suction.
  • suction minus vapor pressure of the liquid at suction temperature.
  • discharge minus vapor pressure of the liquid at the discharge temperature.
Q.33

The ratio of wall drag to total drag in the Stoke's law range is

  • 0.5
  • 1
  • 1/3
  • 2/3
Q.34

In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where, T = absolute temperature )

  • 1/T
  • 1/T
  • T
  • T
Q.35

A fluid element has a velocity V = -y2 . xi + 2yx2 . j. The motion at (x, y) = (l/2,is

  • rotational and incompressible
  • rotational and compressible
  • irrotational and compressible
  • irrotational and incompressible
Q.36

Brownian movement is prominent in the particle size range of __________ microns in case of settling of a particle in a fluid.

  • 2 to 3
  • 0.01 to 0.10
  • 200 to 300
  • 100 to 1000
Q.37

Boundary layer separation occurs when the

  • pressure reaches a minimum.
  • cross-section of the channel is reduced.
  • valve is closed in a pipeline.
  • velocity of sound is reached.
Q.38

Remote control valve is a __________ valve.

  • gate
  • butterfly
  • needle
  • globe
Q.39

In turbulent flow, a rough pipe has the same friction factor as a smooth pipe

  • in the zone of complete turbulence.
  • when the roughness projections are much smaller than the thickness of the laminar film.
  • everywhere in the transition zone.
  • when the friction factor is independent of the Reynold's number.
Q.40

Slugging in a fluidised bed can be avoided by using

  • tall narrow vessel.
  • deep bed of solids.
  • shallow beds of solids and proper choice of particle size.
  • very large particles.
Q.41

Foot valves provided in pumps are __________ valves.

  • relief
  • three/four way
  • pressure reducing
  • directional control
Q.42

The co-efficient of drag and lift for an incompressible fluid depends on the

  • Reynolds number
  • Froude number
  • Mach number
  • all (a), (b) and (c)
Q.43

The terminal velocity of a particle moving through a fluid varies as dpn. What is the value of n' for Newton's law regime ?

  • 0.5
  • 1
  • 1.5
  • 3
Q.44

For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is the superficial liquid velocity and Dp is the particle diameter)

  • Vs/Dp2
  • Vs2/Dp2
  • Vs2/Dp3
  • Vs/Dp3
Q.45

Laminar flow of a Newtonion fluid ceases to exist, when the Reynolds number exceeds

  • 4000
  • 2100
  • 1500
  • 3000
Q.46

Priming is needed in a __________ pump.

  • reciprocating
  • gear
  • centrifugal
  • diaphragm
Q.47

Manometers measure the __________ pressure.

  • vacuum as well as the atmospheric
  • difference in
  • absolute
  • gage
Q.48

Surge tanks are provided in high pressure water pipelines to

  • store a definte quantity ofwater all the time,
  • reduce the water hammer.
  • facilitate easy dismantling of pipeline for cleaning and maintenance.
  • none of these.
Q.49

Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg.

  • 1
  • 0.1
  • 0.01
  • 0.001
Q.50

Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is

  • Q/2
  • Q/4
  • Q/8
  • Q/16
0 h : 0 m : 1 s