Q.1

Which of the following valves will incur maximum pressure drop for the same discharge of water ?

  • Globe valve
  • Gate valve
  • Needle valve
  • Butterfly valve
Q.2

Pressure gradient in the pipe flow is influenced by the

  • diameter of pipe.
  • velocity of the fluid.
  • density & viscosity of the fluid.
  • all (a), (b) and (c).
Q.3

Pressure drop in a fluidised bed reactor is __________ that in a similar packed bed reactor.

  • less than
  • more than
  • same as
  • none of these
Q.4

__________ pump is the most suitable device for discharging a liquid against a pressure of ≥kgf/cm2.

  • Centrifugal
  • Piston
  • Plunger
  • Vane
Q.5

Viscosity of a liquid decreases __________ with rise in temperature.

  • exponentially
  • linearly
  • logarithmically
  • none of these
Q.6

The maximum discharge through a circular channel takes place, when the depth of the fluid flow is __________ times the pipe diameter.

  • 0.25
  • 0.5
  • 0.66
  • 0.95
Q.7

In deriving Bernoulli's equation, fluid is assumed to be

  • incompressible, frictionless, steady, along a streamline.
  • uniform, steady, incompressible, along a streamline.
  • steady, density being pressure dependent, frictionless.
  • none of these.
Q.8

With increase in molecular weight of the gas, the head developed by a centrifugal compressor will

  • decrease
  • increase
  • remain same
  • unpredictable
Q.9

For flow through a venturi at a particular discharge, the correct relationships among heads at points X, Y, and Z are

  • h1 > h2 < h3
  • h1 > h2 > h3
  • h2 < h1 < h3
  • h1 < h2 < h3
Q.10

Major loss in sudden contraction in pipe flow is due to

  • boundary friction.
  • flow contraction.
  • expansion of flow after sudden contraction.
  • none of these.
Q.11

The continuity equation

  • relates mass flow rate along a stream tube.
  • relates work and energy.
  • stipulates that Newton's second law of motion must be satisfied at every point in the fluid.
  • none of these.
Q.12

__________ pumps are a group of vacuum pumps.

  • Hyter
  • Sump
  • Mono
  • Submerged
Q.13

Boiler feed water pump is usually a __________ pump.

  • reciprocating
  • gear
  • multistage centrifugal
  • diaphragm
Q.14

In case of a pipe of constant cross-sectional area, the maximum fluid velocity obtainable is

  • the velocity of sound.
  • dependent on its cross-sectional area.
  • dependent on fluid viscosity.
  • dependent on fluid density.
Q.15

Discharge in laminar flow through a pipe varies

  • as the square of the radius.
  • inversely as the pressure drop.
  • inversely as the viscosity.
  • as the square of the diameter.
Q.16

When the head pumped against is less than the head of the fluid used for pumping, the usual device is a/an

  • ejector
  • blower
  • injector
  • airlift
Q.17

Two fluids are flowing through two similar pipes of the same diameter. The Reynold's number is same. For the same flow rate if the viscosity of a fluid is reduced to half the value of the first fluid, the pressure drop will

  • increase
  • decrease
  • remain unchanged
  • data insufficient to predict relative pressure drop.
Q.18

Forces acting on a particle settling in fluid are __________ forces.

  • gravitational & buoyant.
  • centrifugal & drag.
  • gravitational or centrifugal buoyant drag.
  • external, drag & viscous.
Q.19

Unit of mass velocity is

  • kg/hr
  • kg/m2. hr
  • kg/m2
  • kg/m3. hr
Q.20

Pressure difference between two points in vessels, pipelines or in two different pipelines can be measured by a differential manometer. The pressure difference measured as the mm of water coloumn in case of mercury-water, differential manometer is equal to (where, H = difference in height of mercury column in mm).

  • H
  • 12.6 H
  • 13.6 H
  • 14.6 H
Q.21

The boundary layer thickness at a given section along a flat plate __________ with increasing Reynold's number.

  • increases
  • decreases
  • remains same
  • may increase or decrease
Q.22

In magnetic flow meters, voltage generation is

  • due to the motion of conducting fluid through an externally generated uniform field.
  • proportional to the fluid velocity.
  • both (a) and (b).
  • neither (a) nor (b).
Q.23

Which of the following can be used to create a flow of gas, where no significant compression is required ?

  • Reciprocating compressor
  • Blower
  • Axial flow compressor
  • Centrifugal compressor
Q.24

The ratio of actual discharge to theoretical discharge through an orifice is equal to

  • Cc . Cv
  • Cc . Cd
  • Cv . Cd
  • Cd/Cv
Q.25

The energy loss over a length of pipeline according to Darcy-Weisbach equation for pipe flow is.....the mean velocity of flow.

  • directly proportional to
  • directly proportional to square of
  • inversely proportional to
  • inversely proportional to square of
Q.26

Plunger pumps are used for

  • higher pressure
  • slurries
  • viscous mass
  • none of these
Q.27

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

  • 0.5
  • 2
  • 4
  • 1
Q.28

The lift of a ballon is

  • increased, as it rises to a higher altitude.
  • due to the weight of the atmospheric air, that it displaces.
  • not dependent on the temperature of the atmosphere.
  • none of these.
Q.29

What is the value of co-efficient of discharge for square edged circular orifice (for β = 0.3 to 0.?

  • 0.61 - 0.63
  • 0.5 - 0.75
  • 0.75 - 0.90
  • 0.35 - 0.55
Q.30

A lubricanttimes more viscous than water would have a viscosity (in Pa.s)

  • 0.01
  • 0.1
  • 1
  • 10
Q.31

For a fluid rotating at constant angular velocity about vertical axis as a rigid body, the pressure intensity varies as the

  • square of the radial distance.
  • radial distance linearly.
  • inverse of the radial distance.
  • elevation along vertical direction.
Q.32

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

  • axial flow
  • centrifugal
  • mixed flow
  • none of these
Q.33

Cp/Cv is termed as

  • adiabatic constant
  • Mach number
  • Weber number
  • Prandtl number
Q.34

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

  • Kozney-Karman
  • Blake-Plummer
  • Leva's
  • Fanning friction factor
Q.35

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

  • Newtonion
  • pseudoplastic
  • dilatent
  • Bingham plastic
Q.36

What is the ratio of displacement thickness to nominal thickness for a linear distribution of velocity in the boundary layer on a flat plate ?

  • 0.5
  • 1
  • 1.5
  • 2
Q.37

Transition length for turbulent flow in smooth pipe is equal to __________ times the pipe diameter.

  • 0.5
  • 5
  • 50
  • 100
Q.38

Hot wire anemometer is used to measure the

  • velocity of liquids.
  • temperature of liquids.
  • velocity of gases.
  • pressure of liquids.
Q.39

Diaphragm pumps are used to transport

  • solids
  • liquids
  • fluids
  • slurries
Q.40

In which of the following body shapes, the pressure drag is large compared to the friction drag ?

  • Stream line body
  • Two dimensional body
  • Bluff body
  • None of these
Q.41

Froude number is the ratio of

  • shear stress to gravitational stress.
  • drag stress to shear stress.
  • inertial stress to shear stress.
  • inertial stress to gravitational stress.
Q.42

The schedule number of a pipe is an indication of its

  • size
  • roughness
  • material density
  • wall thickness
Q.43

__________ is an example of axial flow impeller.

  • Paddle
  • Turbine
  • Propeller
  • all (a), (b) and(c)
Q.44

Pitot tube measures the __________ of a fluid.

  • pressure
  • average velocity
  • average flow rate
  • point velocity
Q.45

In a dry packed bed, the pressure drop will be changed by increasing the flow rate as

  • V1.8
  • V-0.8
  • V
  • V-1
Q.46

Design of the casing of centrifugal pump should be such as to minimise the

  • back flow through impeller
  • loss of kinetic head
  • loss of static head
  • none of these
Q.47

Stoke's law is valid, when NRe, p is less than

  • 2
  • 100
  • 2100
  • 700
Q.48

In turbulent flow, the

  • fluid particles move in an orderly manner.
  • momentum transfer is on molecular scale only.
  • shear stress is caused more effectively by cohesion than momentum transfer.
  • shear stresses are generally larger than in a similar laminar flow.
Q.49

Momentum correction factor used in fluid flow problems accounts for the

  • change in direction of flow.
  • change in total energy.
  • change in pressure.
  • non uniform direction of velocities at inlet & outlet sections.
Q.50

Disc compensators are provided in large diameter fuel gas carrying pipelines to

  • keep the pipe in proper orientation.
  • make the pipe joint leak-proof.
  • account for contraction/expansion of pipe due to temperature changes of the surroundings.
  • account for the pressure variation side the pipeline.
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