Q.1

The speed of sound in an ideal gas varies as the

  • temperature
  • pressure
  • density
  • none of these
Q.2

Check valves are used

  • at high pressure.
  • in bends.
  • for controlling water flow.
  • for unidirectional flow.
Q.3

A venturimeter measures the

  • velocity head
  • pressure
  • point velocity
  • none of these
Q.4

Path followed by water jet issuing from the bottom of a water tank will be a

  • parabola (vertex being at the opening).
  • hyperbola.
  • horizontal straight line.
  • zig-zag path (which is geometrically undefined).
Q.5

Which of the following must be followed by the flow of a fluid (real or ideal)?
(I) Newton's law of viscosity.
(II) Newton's second law of motion.
(III) The continuity equation.
(IV) Velocity of boundary layer must be zero relative to boundary.
(V) Fluid cannot penetrate a boundary.

  • I, II, III
  • II, III, V
  • I, II, V
  • II, IV, V
Q.6

Location of vena-contracta in an orificemeter does not depend upon the

  • type of orifice.
  • density, viscosity & compressibility of the fluid.
  • ratio of pipe diameter to orifice diameter.
  • pipe roughness.
Q.7

One dimensional fluid flow implies the

  • flow in straight lines only.
  • uniform flow.
  • steady uniform flow.
  • flow in which transverse components are zero.
Q.8

The flow of gas along a pipe in the direction of decreasing pressure causes decrease in its

  • viscosity
  • specific volume
  • velocity
  • none of these
Q.9

Foot valve provided in the pump is a __________ valve.

  • direction control
  • back pressure
  • relief
  • pressure reduction
Q.10

The length of the tube necessary for the boundary layer to reach the centre of the tube and for fully developed flow to be established is called the __________ length.

  • equivalent
  • transition
  • Prandtl mixing
  • none of these
Q.11

A perfect gas

  • does not satisfy PV = nRT.
  • is incompressible and has zero viscosity.
  • has constant specific heat.
  • can't develop shear stresses.
Q.12

Which of the following is a dimensionless parameter ?

  • Angular velocity
  • Specific weight
  • Kinematic viscosity
  • None of these
Q.13

N. second/m2 is

  • the S.I. unit of dynamic viscosity.
  • the S.I. unit of kinematic viscosity.
  • equivalent to one poise.
  • equivalent to one stoke.
Q.14

The maximum head that can be developed by a single impeller is __________ ft.

  • 25
  • 100
  • 250-300
  • 1000
Q.15

Gradually varying fluid flow is an example of __________ flow.

  • non-steady uniform
  • non-steady non-uniform
  • steady uniform
  • steady non-uniform
Q.16

In case of a centrifugal pump, the ratio of total delivered pressure to pressure developed with the impeller is called the __________ efficiency.

  • manometric
  • mechanical
  • volumetric
  • overall
Q.17

Which of the following produces maximum pressure difference for transportation of gases ?

  • Vaccum pumps
  • Blowers
  • Fans
  • Compressors
Q.18

Mach number is defined as the ratio of the local flow velocity to the sonic velocity in the fluid. For what value of Mach number, the gases are considered incompressible ?

  • < 0.3
  • > 3
  • 50
  • 1
Q.19

At low Reynolds number

  • viscous forces are unimportant.
  • viscous forces control.
  • viscous forces control and inertial forces are unimportant.
  • gravity forces control.
Q.20

The buoyant force acting on a floating body is dependent on the

  • viscosity of the liquid.
  • weight of the liquid displaced.
  • depth of immersion of the body.
  • surface tension of the liquid.
Q.21

__________ forces act on a particle moving through a stationary fluid.

  • Gravity
  • Drag
  • Buoyant
  • all (a), (b), & (c)
Q.22

Centrifugal pump can't be used to pump

  • molten sodium (used as a coolant in Fast Breeder Reactor).
  • moderately viscous vegetable oil used in soap industry.
  • thick molten soap at 80°C.
  • none of the above.
Q.23

The discharge co-efficient for an orificemeter does not depend upon the

  • pipe length.
  • ratio of pipe diameter to orifice diameter.
  • type of orifice & the Reynolds number.
  • pipe diameter.
Q.24

Select the correct practical example of steady non-uniform flow.

  • Motion of water around a ship in a lake.
  • Motion of river around bridge piers.
  • Steadily decreasing flow through a reducing section.
  • Steadily increasing flow through a pipe.
Q.25

The temperature in isentropic flow

  • does not depend on Mach number.
  • depends on Mach number only.
  • cannot drop and then increase again downstream.
  • none of these.
Q.26

Drag is the force component exerted on an immersed object,

  • passing the centroid of the body at 60°to the direction of motion.
  • the component being parallel to theflow direction.
  • the component being normal to the flow direction.
  • none of these.
Q.27

Boundary layer exists in flow

  • of real fluids.
  • over flat surfaces only.
  • in pipes only.
  • of ideal fluids only.
Q.28

For laminar flow through a closed conduit

  • Vmax = 2Vav
  • Vmax = Vav
  • Vmax = 1.5Vav
  • Vmax = 0.5Vav
Q.29

A stream line is

  • fixed in space in steady flow.
  • always the path of particle.
  • drawn normal to the velocity vector at every point.
  • a line connecting the mid points of flow cross-section.
Q.30

Hydraulic diameter for non-circular ducts is equal to __________ times the area of flow divided by the perimeter.

  • two
  • three
  • four
  • eight
Q.31

For liquid flow through a packed bed, the superficial velocity as compared to average velocity through the channel in the bed is

  • more
  • less
  • equal
  • independent of porosity
Q.32

Rubber latex is an example of a __________ .fluid.

  • pseudoplastic
  • bingham plastic
  • dilatent
  • Newtonion
Q.33

To handle smaller quantity of fluid at higher discharge pressure, use a __________ pump.

  • reciprocating
  • centrifugal
  • volute
  • rotary vacuum
Q.34

Rubber latex is an example of __________ fluid.

  • dilatent
  • Newtonion
  • pseudoplastic
  • Bingham plastic
Q.35

The maximum head that can be developed by a single impeller is __________ ft.

  • 25
  • 100
  • 250-300
  • 1000
Q.36

In Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the __________ of its diameter.

  • inverse
  • square root
  • second power
  • first power
Q.37

As the velocity V and thus the Reynolds number of a flow past a sphere increases from very low value, the drag force for Re << 1

  • increases linearly with V.
  • decreases linearly with V.
  • decreases as V2.
  • none of these.
Q.38

N. second/m2 is

  • the S.I. unit of dynamic viscosity.
  • the S.I. unit of kinematic viscosity.
  • equivalent to one poise.
  • equivalent to one stoke.
Q.39

For a reciprocating pump, the indicator diagram is the graph between the

  • discharge and overall efficiency.
  • volume swept by piston for one complete revolution and the pressure in the cylinder.
  • angle swept by the crank pin at any instant and the discharge.
  • none of these.
Q.40

Which of the following factors does not contribute to the pressure drop in a pipeline ?

  • Velocity of fluid
  • Size of pipe
  • Length of pipe and number of bends
  • None of these
Q.41

Velocity head on sudden enlargement in a horizontal pipe is converted into __________ head.

  • elevation
  • pressure
  • both (a) & (b)
  • neither (a) nor (b)
Q.42

Which of the following produces maximum pressure difference for transportation of gases ?

  • Vaccum pumps
  • Blowers
  • Fans
  • Compressors
Q.43

Unsteady uniform flow is represented 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.44

The most important factor, which determines the maximum height to which water can be lifted by a pump at standard temperature is the

  • barometric pressure
  • speed of the impeller
  • diameter of the impeller
  • both (b) and (c)
Q.45

The phenomenon occuring during pumping of a liquid solution containing dissolved gases, which may come out of the solution giving rise to gas pockets, is termed as

  • evaporation
  • cavitation
  • sublimation
  • stripping
Q.46

High specific speed of a pump implies that, it is a/an __________ pump.

  • centrifugal
  • mixed flow
  • axial flow
  • none of these
Q.47

Working of a __________ pump characterises mixed flow.

  • turbine
  • piston
  • diaphragm
  • none of these
Q.48

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.
    40-570-1.png
  • for which shear & deformation are related as
  • none of these.
Q.49

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.
    40-570-1.png
  • for which shear & deformation are related as
  • none of these.
Q.50

A gas (density = 1.5 kg/m3 , viscosity =10-5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.at a superficial velocity of 2 m/s causes a pressure drop ofPa/m. The pressure drop for another gas, with density of 1.5kg/m3and viscosity of 3 x 10-5kg/m.s flowing at 3 m/s will be

  • 8400 Pa/m
  • 12600 Pa/m
  • 18900 Pa/m
  • 16800 Pa/m
0 h : 0 m : 1 s