Q.1

It is possible to integrate an automatic flow controller to a

  • flow nozzle
  • venturimeter
  • rotameter
  • none of these
Q.2

Dimension of kinematic viscosity is

  • MLT-1
  • L2 . T-1
  • L2T
  • L2 . T-2
Q.3

Pumping of a corrosive liquid is generally preferred to be done by a __________ pump, as it can be made of a variety of materials including plastics.

  • piston
  • gear
  • positive displacement
  • sump
Q.4

Agate valve fitted in a pipe is replaced by a similar globe valve. Pressure drop in gate valve was Δp. For the same discharge, the pressure drop across globe valve is

  • Δp
  • < Δp
  • > Δp
  • Δp2
Q.5

The equation relating friction factor to Reynold number, f-0.5 = 4 loge (NRe/f)-0.4, is called the __________ equation.

  • Nikuradse
  • Von-Karman
  • Blausius
  • Colebrook
Q.6

For water, when the pressure increases, the viscosity

  • also increases
  • decreases
  • remains constant
  • first decreases, and then increases
Q.7

For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance).

  • V/Vmax = (x/r)1/7
  • V/Vmax = (r/x)1/7
  • V/Vmax = (x.r)1/7
  • none of these
Q.8

A fluid is a substance, that

  • has to be kept in a closed container.
  • is almost incompressible.
  • has zero shear stress.
  • flows when even a small shear is applied to it.
Q.9

Cavitation in a centrifugal pump can be avoided by keeping the

  • inlet pressure high
  • outlet pressure low
  • inlet pressure low
  • outlet pressure high
Q.10

For a given Reynolds number, in a hydraulically smooth pipe, further smoothening __________ the friction factor.

  • brings about no further reduction of
  • increases
  • decreases
  • none of these
Q.11

Pick out the correct statement.

  • Fanning friction factor is inversely proportional to Reynolds number always.
  • The property of a randomly packed bed (with raschig rings) is given by the ratio of the total volume to the volume of voids in the bed.
  • Mach number in an incompressible fluid is always unity.
  • Mach number is given by the ratio of the speed of the fluid to that of sound in the fluid under conditions of flow.
Q.12

For flow past a flat plate, if x is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to

  • x
  • 1/x
  • x
  • 1/x
Q.13

The specific speed of a pump is defined as the speed of a unit of such a size, that it

  • delivers unit discharge at unit head.
  • requires unit power for unit head.
  • delivers unit discharge at unit power.
  • none of these.
Q.14

In case of centrifugal fan or blower, the gas capacity varies as

  • speed
  • (speed)2
  • (speed)3
  • (speed)0.5
Q.15

Unsteady non-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.16

Pick out the correct statement.

  • Human blood is a Newtonion fluid.
  • A Newtonion fluid obeys Newton's law of cooling.
  • For a non-Newtonion fluid, a straight line passes through the origin in a plot between shear stress and shear gradient.
  • Thin lubricating oil is an example of a non-Newtonion fluid.
Q.17

The head loss due to sudden contraction is proportional to

  • velocity
  • velocity head
  • turbulence
  • none of these
Q.18

The capacity of a centrifugal pump Can be increased by increasing the

  • impeller diameter or speed.
  • number of pumps and joining them in series,
  • number of pumps and joining them in parallel.
  • all (a), (b) and (c).
Q.19

The range of a particular rotameter can be increased by

  • use of floats of different densities.
  • no means.
  • increasing the diameter of the float.
  • decreasing the diameter of the float.
Q.20

Glass pipes can be joined by

  • flanges
  • welding
  • soldering
  • bell and spigot joint
Q.21

A streamline is a line in flow field,

  • that is traced by all the fluid particles passing through a given point.
  • along which a fluid particle travels.
  • such that at every point on it, the velocity is tangential to it.
  • none of these.
Q.22

The main factor on which the behaviour of a mass of fluidised solid depends mainly is the

  • fluid characteristics
  • particle size
  • both (a) and (b)
  • neither (a) nor (b)
Q.23

The contraction co-efficient for Borda's mouthpiece (for frictionless fluid) is

  • 0.1
  • 0.5
  • 0.94
  • 1
Q.24

Which of the following has the maximum compression ratio ?

  • Blower
  • Compressor
  • Vacuum pump
  • Fan
Q.25

The pressure intensity is the same in all directions at a point in a fluid

  • only when the fluid is frictionless.
  • only when the fluid is at rest having zero velocity.
  • when there is no motion of one fluid layer relative to an adjacent layer.
  • regardless of the motion of one fluid layer relative to an adjacent layer.
Q.26

Vane anemometer

  • is an area meter.
  • is a variable head meter.
  • rotates an element at a speed determined by the velocity of the fluid in which the meter is immersed.
  • none of these.
Q.27

Power number is the ratio of

  • drag stress to inertial stress.
  • inertial stress to drag stress.
  • inertial stress to gravitational stress.
  • gravitational stress to drag stress.
Q.28

The friction factor is

  • always inversely proportional to the Reynolds number.
  • not dimensionless.
  • not dependent on the roughness of the pipe.
  • none of these.
Q.29

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.
Q.30

Prandtl number is a measure of the

  • heat conduction to viscosity of a fluid.
  • Cp/Cv of a fluid.
  • elastic force to pressure force in the fluid flow.
  • inertial force to elastic force in the fluid flow.
Q.31

What is the unit of kinematic viscosity in SI unit ?

  • M2/sec
  • N/m2 . sec
  • Kg . sec/m
  • None of these
Q.32

Cavitation occurs in a centrifugal pump when the suction pressure is

  • less than the vapour pressure of the liquid at that temperature.
  • greater than the vapour pressure of the liquid at that temperature.
  • equal to the vapour pressure.
  • equal to the developed head.
Q.33

Which law is followed by the velocity distribution in the turbulent boundary layer?

  • Parabolic law
  • Linear law
  • Logarithmic law
  • None of these
Q.34

Which of the following is dimensionless ?

  • Angular velocity
  • Fanning friction factor
  • Specific volume
  • None of these
Q.35

If two capillary tubes of dia 0.5 mm and 1 mm are dipped in a pot containing mercury, then the rise of mercury is

  • same in both the tubes.
  • greater in 1 mm dia tube.
  • greater in 0.5 mm dia tube.
  • zero in both the tubes.
Q.36

While starting an axial flow pump, its delivery valve should be kept

  • open
  • closed
  • either open or closed
  • none of these
Q.37

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

  • 1500
  • 330
  • 1000
  • 3000
Q.38

Purpose of air lift pump is to

  • compress air.
  • lift compressed air.
  • lift water from a well by using compressed air.
  • lift air under negative pressure.
Q.39

What is the co-efficient of contraction, if a fluid jet discharging from amm diameter orifice has amm diameter at its vena-contracta ?

  • 0.64
  • 1.65
  • 0.32
  • 0.94
Q.40

Scale up of agitator design requires

  • geometrical similarity only.
  • dynamic similarity only.
  • both geometrical and dynamic similarity.
  • all geometrical, dynamic and kinematic similarity.
Q.41

A centrifugal pump has the following specifications:
Power = 4 H.P.; Speed =rpm
Head = 8 metres
Flow =litres/minutes.
If its speed is halved, then the new head will be __________ metres.

  • 2
  • 4
  • 8
  • 5.5
Q.42

The head loss due to sudden expansion is

Q.43

The losses in open channel flow generally vary as the

  • inverse of the roughness.
  • first power of the roughness.
  • square of the velocity.
  • inverse square of hydraulic radius.
Q.44

A liquid is pumped at the rate oflitres usingrpm. If the rpm is changed tothe liquid pumped is __________ litres.

  • 600
  • 660
  • 1.1
  • 60
Q.45

For laminar flow of a shear thinning liquid in a pipe, if the volumetric flow rate is doubled, the pressure gradient will increase by a factor of

  • 2
  • <2
  • >2
  • 1/2
Q.46

__________ forces do not act in case of fluid flow.

  • Elastic
  • Tensile
  • Vibratory
  • Centrifugal
Q.47

Two piping system are said to be equivalent, when the __________ are same.

  • fluid flow rate & friction loss
  • length & friction factor
  • diameter & friction factor
  • length & diameter
Q.48

Pick out the correct statement pertaining to venturimeter.

  • A venturimeter with a fixed pressure drop discharges more, when the flow is vertically downward, than when the flow is vertically upward.
  • The co-efficient of contraction of a venturimeter is always unity.
  • For a fixed pressure drop, the discharge of a gas through a venturimeter is greater, when compressibility is taken into account, than when it is neglected.
  • none of these.
Q.49

For an unstable equilibrium of a floating body (where, M = metacentre.)

  • M is above G
  • M is below G
  • M & G coincide
  • none of these
Q.50

The actual velocity at vena-contracta for flow through an orifice from a reservoir is given by

  • Cv . 2gH
  • Cc . 2gH
  • Cd . 2gH
  • Cv . Va
0 h : 0 m : 1 s