Q.1

A venturimeter can not be used for the direct measurement of

  • datum difference in the stretch of pipeflow
  • pressure difference in the flow throughpipeline.
  • friction loss in pipe flow.
  • all (a), (b) and (c).
Q.2

A centrifugal pump is called a turbine pump, if it is having a

  • turbine type impeller.
  • vaned diffusion casing.
  • rotating vaned volute.
  • none of these.
Q.3

When the water is warm, the height to which it can be lifted by a pump

  • decreases due to reduced viscosity.
  • decreases due to reduced vapour pressure.
  • increases due to increased vapour pressure
  • decreases due to increased frictional resistance.
Q.4

Check valves are used

  • at high pressure.
  • in bends.
  • for controlling water flow.
  • for unidirectional flow.
Q.5

A mercury (specific gravity = 13.manometer connected across an orificemeter fitted in a pipe shows a manometer reading of 2 cms. If the manometer liquid is changed to carbon tetrachloride (specific gravity = 1.6), then for the same flow rate of water the new manometer reading will be __________ cms.

  • 17
  • 42
  • 84
  • 1.8
Q.6

Where does the maximum stress occur in case of laminar flow of incompressible fluid in a closed conduit of diameter 'd'?

  • At the centre
  • At d/4 from the wall
  • At the wall
  • At d/8 from the wall
Q.7

In a fluidised bed reactor

  • temperature gradients are very high.
  • temperature is more or less uniform.
  • hot spots are formed.
  • segregation of the solids occurs.
Q.8

Experimental study of laminar fluid flow through a circular tube was conducted by

  • Reynolds
  • Hagen and Poiseuille
  • Pascal
  • Blake-Plummer
Q.9

The uniformity of a gas fluidised bed depends upon the __________ of the solid particles.

  • size
  • surface properties
  • both (a) and (b)
  • neither (a) nor (b)
Q.10

Fluid flow at increasing rate through a diverging pipe is an example of __________ flow.

  • steady uniform
  • non-steady uniform
  • steady non-uniform
  • non-steady non-uniform
Q.11

Theoretical head developed by a centrifugal pump does not depend upon the __________ the impeller.

  • radius of
  • speed of
  • fluid velocity leaving
  • none of these
Q.12

If more than two branches of pipes are to be connected at the same point, then use a/an

  • elbow
  • union
  • tee
  • none of these.
Q.13

Reciprocating pumps are not able to compete with the centrifugal pump for industrial use, mainly because these pumps have

  • very low speeds.
  • smaller discharge.
  • higher capital &maintenance cost.
  • high vibrations.
Q.14

Turbulent flow generally occurs for cases involving

  • highly viscous fluid
  • very narrow passages
  • very slow motion
  • none of these
Q.15

Reynolds number is the ratio of

  • viscous forces to gravity forces.
  • inertial forces to viscous forces.
  • viscous forces to inertial forces.
  • inertial forces to gravity forces.
Q.16

A mercury (specific gravity = 13.manometer connected across an orificemeter fitted in a pipe shows a manometer reading of 2 cms. If the manometer liquid is changed to carbon tetrachloride (specific gravity = 1.6), then for the same flow rate of water the new manometer reading will be __________ cms.

  • 17
  • 42
  • 84
  • 1.8
Q.17

An equipotential line is __________ to the velocity vector at every point.

  • normal
  • normal
  • tangential
  • none of these
Q.18

In area meter (e.g., rotameter), with increase in the fluid flow rate, the

  • pressure drop increases linearly.
  • pressure drop is almost constant.
  • area through which fluid flows does not vary.
  • none of these.
Q.19

Drag co-efficient in hindered settling is __________ that in free settling.

  • less than
  • equal to
  • not necessarily greater than
  • always greater than
Q.20

In case of end to end connection of two or more pipes in series, the __________ each pipe.

  • same rate of flow passes through
  • head loss is same through
  • rate of flow in each pipe is proportional to the length of
  • total flow rate is the sum of flow rate in
Q.21

The general relationship between speed N, head H, power P and discharge Q for a centrifugal pump is

  • Q∝N : H∝N2 : P∝N3
  • Q∝N2 : H∝N3 : P∝N
  • Q∝N : H∝N3 : P∝N2
  • Q∝N3 : H∝N : P∝N2
Q.22

The peripherial velocity at inlet of a centrifugal pump having inlet diameter ofcms and rotating atrpm is __________ m/sec.

  • 1.8
  • 12.4
  • 186.2
  • 736.4
Q.23

A double acting reciprocating pump compared to a single acting pump (of almost same size working under same pressure levels) would give almost double

  • head
  • discharge
  • efficiency
  • none of these
Q.24

Drag co-efficient in hindered settling is __________ that in free settling.

  • less than
  • equal to
  • not necessarily greater than
  • always greater than
Q.25

Pipes having diameterinches or more are designated by their

  • outside diameter
  • inside diameter
  • schedule number
  • none of these
Q.26

The flow of a liquid through tapering pipe at a constant rate is an example of __________ flow.

  • steady uniform
  • steady non uniform
  • unsteady uniform
  • unsteady non uniform
Q.27

The most economical flow control valve for use with large diameter pipes is a

  • butterfly valve
  • globe valve
  • needle valve
  • none of these
Q.28

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.29

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.30

Which is the correct relationship for a centrifugal pump ? (where, D = Impeller diameter, inches H = Head developed, ft of liquid pumped N = Speed of pump, rpm)

  • D = 1840 H0.5/N
  • D = 1840 N/H0.5
  • H = 1840 D0.5/N
  • D = 1840 H/N
Q.31

Lower BWG means __________ of the tube.

  • lower thickness
  • lower cross-section
  • outer diameter
  • inner diameter
Q.32

Liquid delivery by centrifugal pump starts, only when the head developed by it is equal to the __________ head.

  • manometric
  • total
  • static
  • friction
Q.33

The frictional resistance in laminar flow does not depend on the

  • area of surface in contact.
  • flow velocity.
  • fluid temperature.
  • pressure of flow.
Q.34

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.35

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.36

Efficiency of power transmission (η) through a circular pipe is given by (ht - hf)/ht, which has a maximum value of __________ percent.

  • 33:3
  • 50
  • 66.6
  • 88.8
Q.37

Which of the following equations applies to the fluid flow through a packed bed for very large Reynolds number ?

  • Fanning equation
  • Blake-Pllummer equation
  • Hagen-Poiseulle equation
  • Kozney-Karman equation
Q.38

What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition ?

  • 0.5
  • 0.67
  • 1
  • 2
Q.39

Laminar flow is characterised by the nonexistence of

  • pressure fluctuation.
  • eddies.
  • deviating velocities.
  • all (a), (b)&(c).
Q.40

Which of the following is used for very accurate measurement of flow of gas at low velocity ?

  • Pitot tube
  • Rotameter
  • Segmental orificemeter
  • Hot wire annemometer
Q.41

Viscosity of water at 40°C lies in the range of

  • 1 x 10-3 to 2 x 10-3 kg/m.s
  • 0.5 x 10-3 to 1 x 10-3 kg/m.s
  • 1 to 2 kg/m.s
  • 0.5 to 1 kg/m.s
Q.42

Pick out the correct statement pertaining to transition/ entrance length in fluid flow.

  • The length of entrance region of pipe, in which full development of fluid flow takes place such that velocity profile does not change downstream, is called the transition length.
  • Transition length for laminar flow of Newtonion fluids in a pipe of diameter 'd' is equal to 0.05. D.NRe.
  • Transition length for turbulent flow of Newtonion fluids in a smooth pipe of diameter 'd' is equal to 50 D.
  • all (a), (b) and (c).
Q.43

Each term in Bernaulli's equation represents the __________ of the fluid.

  • energy per unit mass
  • energy per unit weight
  • force per unit mass
  • none of these
Q.44

Which of the following is used for very accurate measurement of flow of gas at low velocity ?

  • Pitot tube
  • Rotameter
  • Segmental orificemeter
  • Hot wire annemometer
Q.45

The discharge through a venturimeter depends upon

  • pressure drop only.
  • its orientation.
  • co-efficient of contraction only.
  • none of these.
Q.46

The speed of sound in an ideal gas varies as the

  • temperature
  • pressure
  • density
  • none of these
Q.47

Check valves are used

  • at high pressure.
  • in bends.
  • for controlling water flow.
  • for unidirectional flow.
Q.48

A venturimeter measures the

  • velocity head
  • pressure
  • point velocity
  • none of these
Q.49

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.50

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
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