Q.1

Propeller type centrifugal pumps are most suitable for

  • high capacity at high heads.
  • high capacity at low heads.
  • low capacity at high heads.
  • low capacity at low heads.
Q.2

Which is not a variable head meter ?

  • Venturimeter
  • Pitot tube
  • Rotameter
  • None of these
Q.3

The fluid velocity varies as the square of the cylindrical pipe diameter, in case of steady state laminar flow at constant pressure drop, for __________ fluid.

  • Newtonion
  • dilatant
  • pseudoplastic
  • non-Newtonion
Q.4

For steady ideal fluid flow, the Bernoulli's equation states that the

  • velocity is constant along a stream line.
  • energy is constant throughout the fluid
  • energy is constant along a stream line, but may vary across stream lines
  • none of these
Q.5

Normal depth in open channel flow is the depth of flow in the channel

  • corresponding to uniform flow.
  • measured normal to the channel bed.
  • corresponding to steady flow.
  • none of these.
Q.6

Minimum porosity for fluidisation is

  • that corresponding to static bed.
  • that corresponding to completely fluidised bed.
  • the porosity of the bed when true fluidisation begins.
  • less than that of the' static bed.
Q.7

Reynolds number for flow of water at room temperature through 2 cm dia pipe at an average velocity of 5 cm/sec is around

  • 2000
  • 10
  • 100
  • 1000
Q.8

Froude number is not a factor

  • for Reynolds number greater than 300.
  • when there is no vortex formation.
  • for unbaffled tank.
  • none of these.
Q.9

Which of the following is not dimension-less?

  • Froude number
  • Kinematic viscosity
  • Pressure co-efficient
  • None of these
Q.10

The __________ pressure is measured by a static tube.

  • dynamic
  • static
  • total
  • none of these
Q.11

Specific speed of a centrifugal pump depends upon the __________ head.

  • suction
  • delivery
  • manometric
  • none of these
Q.12

Which of the following is used for pumping crude oil from oil well ?

  • Single stage centrifugal pump
  • Gear pump
  • Screw pump
  • Duplex/triplex reciprocating pump
Q.13

Discharge from ainch pipe of water atft/sec will be __________ ft3/sec.

  • 7.65
  • 32.36
  • 48.22
  • 125.6
Q.14

Paper pulp is an example of __________ fluid.

  • dilatant
  • bingham plastic
  • Newtonion
  • pseudoplastic
Q.15

Momentum transfer in laminar flow of fluids results due to the

  • viscosity
  • density
  • velocity gradient
  • none of these
Q.16

For motion of spherical particles in a stationary fluid, the drag co-efficient in hindered settling compared to that in free settling is

  • more
  • less
  • equal
  • more or less, depending on the type of particle
Q.17

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

  • irrotational.
  • incompressible.
  • viscous.
  • all (a), (b) & (c).
Q.18

Viscosity of water is about __________ times that of air at room temperature.

  • 15
  • 55
  • 155
  • 1050
Q.19

In case of a centrifugal pump, the theoretical head developed is dependent on the __________ the impeller.

  • speed of
  • diameter of
  • fluid velocity leaving
  • all (a), (b) and (c)
Q.20

A hydraulic press has a ram ofcms in diameter and a plunger of 1 cm in diameter. The force required on the plunger to raise a weight oftons on the ram is __________ kg.

  • 10
  • 100
  • 1000
  • 10000
Q.21

Open channel liquid flow is most conveniently measured by a

  • hot wire anemometer
  • notch
  • rotameter
  • segmental orifice
Q.22

Which of the following is most prone to pulsating discharge flow ?

  • Centrifugal pump
  • Reciprocating pump
  • Gear pump
  • Axial flow pump
Q.23

The ratio of the depth of flow to the diameter of the channel for maximum discharge in a circular channel in open channel flow is

  • 0.1
  • 0.55
  • 0.95
  • 1.85
Q.24

Which of the following flow measuring devices is an area meter ?

  • Venturimeter
  • Orifice meter
  • Anemometer
  • Rotameter
Q.25

With decrease in particle size to be fluidised by a particular fluid, the operating range of fluidisation velocity

  • widens
  • squeezes
  • does not change
  • unpredictable from the data
Q.26

A centrifugal pump used to pump water is used to pump an oil with specific gravity of 0.8 at the same rate. The power consumption will now

  • increase
  • decrease
  • remain same
  • data insufficient to predict
Q.27

Steady non-uniform flow is exemplified by flow through a/an

  • long pipe at constant rate.
  • long pipe at decreasing rate.
  • expanding tube at increasing rate.
  • expanding tube at constant rate.
Q.28

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.
Q.29

What type of motion the fluid element undergoes, when it changes from one position to another position, such that the angle between the two sides change ?

  • Rotation
  • Translation
  • Linear deformation
  • Angular deformation
Q.30

If three pipes of different diameters, lengths & friction factors are connected in parallel, then (where, Q = flow rate, V= fluid velocity f = friction factor).

  • Q = Q1 + Q2 + Q3
  • V1 = V2 = V3
  • Q1 = Q2 = Q3
  • f = f1 + f2 + f3
Q.31

In laminar flow through a round tube, the discharge varies

  • linearly as the viscosity.
  • inversely as the pressure drop.
  • inversely as the viscosity.
  • as the square of the radius.
Q.32

The speed of a sound wave in a gas is analogous to the speed of

  • an elementary wave in an open channel.
  • flow in an open channel.
  • a disturbance travelling upstream in moving fluid.
  • none of these.
Q.33

Navier-Stokes equation is useful in the analysis of __________ fluid flow problems.

  • non-viscous
  • viscous
  • turbulent
  • rotational
Q.34

The energy loss in flow through ven-turimeter is less than that through flow nozzle, because in case of a flow nozzle, the

  • length is shorter.
  • throat diameter is more.
  • sudden expansion of flow in the downstream occurs.
  • distance between the throat and the inlet is more.
Q.35

The capillary rise of mercury is maximum in glass tube of dia __________ mm.

  • 0.5
  • 1
  • 2
  • 5
Q.36

Specific speed of a centrifugal pump relates it with another pump having the

  • dynamic similarity
  • same efficiency
  • same speed
  • geometrical similarity
Q.37

The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by(where, x = each side of the square duct)

  • x
  • πx
  • 2x
  • x/2
Q.38

Net positive suction head (NPSH) of a centrifugal pump must be

  • greater than the vapour pressure of the liquid.
  • less than the vapour pressure of the liquid.
  • equal to the vapour pressure of the liquid.
  • less than barometric pressure.
Q.39

Absolute viscosity of a fluid is a function of the __________ of the fluid.

  • motion
  • pressure & temperature
  • shearing stress
  • both(b)&(c)
Q.40

A fluid is the one, which

  • cannot remain at rest under the action of shear force.
  • continuously expands till it fills any container.
  • is incompressible.
  • permanently resists distortion.
Q.41

Choose the set of pressure intensities that are equivalent.

  • 4.33 psi, 10 ft. of water, 8.83 inches of Hg.
  • 4.33 psi, 10 ft. of water, 20.7 inches of Hg.
  • 10 psi, 19.7 ft. of water, 23.3 inches of Hg.
  • 10 psi, 19.7 ft. of water, 5.3 inches of Hg.
Q.42

Toothpaste is a

  • Bingham plastic
  • pseudoplastic
  • Newtonion liquid
  • dilatent
Q.43

A streamline is

  • the line connecting the mid-points of flow cross-sections.
  • defined for uniform flow only.
  • drawn normal to the velocity vector at every point.
  • always the path of a particle.
Q.44

Diaphragm valves are used for handling __________ fluids.

  • corrosive
  • viscous
  • non-Newtonion
  • solid suspended
Q.45

The maximum depth from which a centrifugal pump can draw water is

  • dependent on the speed of the pump.
  • dependent on the power of the pump.
  • 34 feet.
  • 150 feet.
Q.46

In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant ?

  • Rotational
  • Unsteady
  • Turbulent
  • Non-uniform
Q.47

Horsepower requirement for given pump capacity depends upon the

  • specific gravity of the liquid
  • suction lift
  • discharge head
  • all (a), (b) and (c)
Q.48

Mercury is an ideal barometric fluid mainly due to its

  • high density.
  • low compressibility.
  • low capillary action.
  • very low vapor pressure.
Q.49

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

  • Potential
  • Streamline
  • Creep
  • Boundary layer
Q.50

Air vessel fitted to a reciprocating pump

  • increases the work done.
  • decreases the work done.
  • causes cavitation.
  • results in non-uniform discharge.
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