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Quiz 13
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Q.1
An equipotential line is __________ to the velocity vector at every point.
Normal
Normal
Tangential
None of these
Q.2
Which of the following relationship is valid for the equilibrium position of the float in a rotameter ?(where, D
f
= Drag force on the float B
f
= Buoyant force on the float W
f
= Weight of the float)
D
f
+ B
f
= W
f
D
f
= B
f
+ W
f
D
f
+ B
f
+ W
f
=0
None of these
Q.3
With increasing flow rate, the hydraulic efficiency of a centrifugal pump
Monotonically decreases
Decreases and then increases
Remains constant
Increases and then decreases
Q.4
What is the ratio of fluid carrying capacity of two pipes having diameters d₁ and d₂ respectively?
(d₁/d₂)
0.8
(d₁/d₂)
0.5
(d₁/d₂)
(d₁/d₂)
2
Q.5
What is the pipe called which lifts water from a reservoir to a greater height than the initial level in the supply reservoir?
Penstock
Siphon
Tunnel
Pressure pipeline
Q.6
Which is the most efficient and best for measuring very small flow rate of gases?
Venturimeter
Orifice meter
Rotameter
Flow nozzle
Q.7
Each term of the Bernoulli's equation written in the form, P/ρ + g/g
c
.Z + v²/2g
c
= constant , represents the total energy per unit
Mass
Volume
Specific weight
None of these
Q.8
The rate of shear versus the shear stress curves are time dependent for __________ fluid.
Thixotropic
Rheopectic
Both A and B
Neither A nor B
Q.9
Specific speed of a centrifugal pump depends upon the __________ head.
Suction
Delivery
Manometric
None of these
Q.10
The energy equation, E + P/ρ + V²/2g +gZ (E = internal energy/mass), is applicable to
Perfect gases only
Isothermal flow of gases
Adiabatic unsteady flow of gases
All of the above
Q.11
The dimension of dynamic viscosity is
ML⁻¹T⁻¹
L²T⁻¹
LT⁻²
ML⁻¹T⁻²
Q.12
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.13
Pressure drop in packed bed for turbulent flow is given by the __________ equation.
Kozney-Karman
Blake-Plummer
Leva's
Hagen-Poiseulle's
Q.14
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.15
Fluid flow through a packed bed is represented by the __________ equation.
Fanning's
Ergun's
Hagen-Poiseuille's
None of these
Q.16
Volute of a centrifugal pump should be designed in a fashion, such that the
Kinetic head gets converted into static head
Moving stream gradually reduces velocity
Mean velocity remains constant
None of these
Q.17
One poise (unit of absolute/dynamic viscosity) is equivalent to one
Gm/cm². sec
Gm/cm. sec
Cm²/sec
M²/sec
Q.18
Poise is converted into stoke by
Multiplying with density (gm/c.c)
Dividing by density (gm/c.c)
Multiplying with specific gravity
Dividing by specific gravity
Q.19
Boundary layer separation is caused by the
Reduction of pressure to vapour pressure
Boundary layer thickness reducing to zero
Adverse pressure gradient
Reduction of pressure gradient to zero
Q.20
Pressure drop in a packed bed for laminar flow is given by the __________ equation.
Kozney-Karman
Blake-Plummer
Leva's
Fanning friction factor
Q.21
Discharge from a 24 inch pipe of water at 10 ft/sec will be __________ ft³/sec.
7.65
32.36
48.22
125.6
Q.22
Minimum fluidisation velocity for a specific system depends upon the
Particle size
Fluid viscosity
Density of both the particle & the fluid
All of the above
Q.23
When the pipe Reynold's number is 6000, the flow is generally
Viscous
Laminar
Turbulent
Transition
Q.24
The maximum delivery pressure of compressors can be upto __________ atmospheres.
10
100
250
1000
Q.25
In case of a rotameter, the density of the float material is __________ that of the liquid it replaces.
More than
Less than
Equal to
Either A or B
Q.26
A centrifugal pump has the following specifications:
Power = 4 H.P.; Speed = 800 rpm
Head = 8 metres
Flow = 1000 litres/minutes.
If its speed is halved, then the new head will be __________ metres.
2
4
8
5.5
Q.27
In hindered settling, the particles are
Placed farther from the wall
Not affected by other particles and the wall
Near each other
None of these
Q.28
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.29
Fluidised beds are formed, when the
Fluid friction is zero
Gravity force is less than the fluid friction
Pressure forces equal gravity forces
Sum of the fluid friction and pressure forces is equal and opposite to gravity forces
Q.30
Isotropic turbulence occurs
Where there is no velocity gradient
At higher temperatures
Only in Newtonion fluids
None of these
Q.31
Pick out the wrong statement.
Surface tension of a liquid is because of the difference in magnitude of adhesive & cohesive forces
A hydrometer used for the determination of specific gravities of liquids works on the principle of buoyant forces
In case of unsteady fluid flow, the velocity at any given point does not change with time
Turbulent fluid flow is characterised by the rapid fluctuation of instantaneous pressure & velocity at a point
Q.32
Which of the following flow measuring devices is an area meter?
Venturimeter
Orifice meter
Anemometer
Rotameter
Q.33
For a given fluid flow rate, which of the following incurs maximum head loss?
Orifice meter
Venturimeter
Flow nozzle
All of the above
Q.34
The ratio of width to depth for the most economical rectangular section in open channel flow is
0.5
1
1.5
2
Q.35
Drag is defined as the force exerted by the
Fluid on the solid in a direction opposite to flow
Fluid on the solid in the direction of flow
Solid on the fluid
None of these
Q.36
Which of the following is a dimensionless parameter?
Angular velocity
Specific weight
Kinematic viscosity
None of these
Q.37
For very low pressure and high discharge rate, the compressor used is a/an __________ compressor.
Axial
Reciprocating
Rotary
None of these
Q.38
Capacity of a hydraulic accumulator is defined in terms of maximum
Amount of energy stored
Flow rate through accumulator
Rate of falling of ram
Volume available in the cylinder
Q.39
A mercury (specific gravity = 13.6) 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.40
Hydrometer measures the specific gravity of liquids based on the principles of buoyancy. Pycnometer is used to measure the specific gravity of
Powder & grannular solids
Liquids
Low melting point semi-solids
All of the above
Q.41
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.42
The momentum correction factor for the velocity distribution of laminar flow is
1.3
1.66
2.5
None of these
Q.43
The dimension of surface tension is
ML⁻²
MT⁻²
MLT⁻²
ML⁻²T
Q.44
With a constant diameter impeller of a centrifugal pump
Its capacity varies directly as the square of speed
Head varies as the square of speed
Horsepower input varies as the square of speed
Head varies as the speed
Q.45
Water hammer in a pipeline results from the
Bursting of pipelines due to closure by a valve
Rapid pressure change due to a rapid change in the rate of flow
Pressure increase due to closure of a valve resulting in decrease in rate of flow
None of these
Q.46
Air vessel provided in a reciprocating pump is for
Increasing the acceleration head
Making the friction in pipe uniform
Decreasing the acceleration head
None of these
Q.47
In parallel pipe problems, the
Head loss is the same through each pipe
Discharge is the same through all the pipes
Total head loss is equal to the sum of the head losses through each pipe
None of these
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
A rotameter through which air at room temperature and atmospheric pressure is flowing gives a certain reading for a flow rate of 100 cc/sec. If helium (molecular weight 4) is used and rotameter shows the same reading, the flow rate (cc/sec) is
26
42
269
325
Q.50
A weir is used to measure the large water discharge rate from a river or from an open channel. A weir is not of __________ shape.
Circular
Rectangular
Triangular
Trapezoidal
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