Fluid Mechanics Exam Questions & Answers PDF | Complete Engineering Practice Test
surface tension The fluid property, due to which, mercury does not wet the glass is
surface tension
viscosity
cohesion
adhesion
2100 Laminar flow of a Newtonion fluid ceases to exist, when the Reynolds number
exceeds
4000
2100
1500
3000
jet pump When the momentum of one fluid is used for moving another fluid, such a device is
called a/an
jet pump
blower
acid egg
none of these
having no motion of one fluid layer relative to the other. The normal stress is the same in all directions at a point in a fluid, when the fluid is
non-viscous.
incompressible.
both (a) and (b).
having no motion of one fluid layer relative to the other.
both (a) and (b) Head developed by a centrifugal pump depends on its
speed
impeller diameter
both (a) and (b)
neither (a) nor (b)
mean velocity Hydraulic mean depth (Dm) for a circular pipe of diameter 'D' flowing full is 0.25 D.
For a circular channel, at Dm = 0.3 D, gives the condition for the maximum
flow rate
mean velocity
both 'a' & 'b'
neither 'a' nor 'b'
as (velocity)^2 The head loss in turbulent flow in a pipe varies
as velocity
as (velocity)^2
inversely as the square of diameter
inversely as the velocity
sleevejoint Most commonly used joint in the underground pipe lines is the
sleevejoint
coupling
flange
expansion joint
1000 P'/S Schedule number of a pipe, which is a measure of its wall thickness, is given by
1000 P'/S
100 P'/S
1000 S/P'
10000 P'/S
Stuvia 2026-2027
, Fluid Mechanics Exam Questions & Answers PDF | Complete Engineering Practice Test
suction minus vapor pressure of the liquid at suction The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of
temperature. the velocity head and the pressure head at the
discharge.
suction.
suction minus vapor pressure of the liquid at suction temperature.
discharge minus vapor pressure of the liquid at the discharge temperature.
monotonically decreases. With increasing flow rate, the hydraulic efficiency of a centrifugal pump
monotonically decreases.
decreases and then increases.
remains constant.
increases and then decreases.
logarithmic The velocity profile for turbulent flow through a closed conduit is
logarithmic
parabolic
hyperbolic
linear
friction co-efficient for flows at equal Reynold number. In case of hydraulically smooth pipe, the resistance to flow depends only on the
Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is
governed by the relative roughness. Two pipes are said to have the same hydraulic
roughness, when they have equal values of
relative roughness.
absolute roughness.
friction co-efficient for flows at equal Reynold number.
all (a), (b) & (c).
rapid pressure change due to a rapid change in the rate of Water hammer in a pipeline results from the
flow.
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.
centrifugal Molten soap mass is transported by a __________ pump.
diaphragm
reciprocating
gear
centrifugal
Mach number Which of the following denotes the effect of compressibility in fluid flow ?
Weber number
Mach number
Euler number
Reynolds number
smaller than Nominal size of the discharge pipe of a pump is usually __________ the nominal
size of the inlet pipe.
smaller than
larger than
same as
twice
inverse of the fluid viscosity. The terminal velocity of a small sphere settling in a viscous fluid varies as the
first power of its dimeter.
inverse of the fluid viscosity.
inverse square of the diameter.
square of the difference in specific weights of solid & fluid.
Stuvia 2026-2027
, Fluid Mechanics Exam Questions & Answers PDF | Complete Engineering Practice Test
increases If the discharge of a centrifugal pump is throttled, then its suction lift
increases
decreases
remains unchanged
data insufficient to predict
directional control Foot valves provided in pumps are __________ valves.
relief
three/four way
pressure reducing
directional control
inertial forces control and viscous forces are unimportant. At high Reynolds number
inertial forces control and viscous forces are unimportant.
viscous forces predominate.
inertial forces are unimportant and viscous forces control.
none of these.
more than Power loss in an orificemeter is __________ that in a venturimeter.
less than
same as
more than
data insufficient, cannot be predicted
0.5 The terminal velocity of a particle moving through a fluid varies as dpn. What is the
value of n' for Newton's law regime ?
0.5
1
1.5
3
7 to 15 What is the normal range of exit cone angle of a venturimeter ?
2 to 5
7 to 15
15 to 25
>25
ML^-1^T-1 The dimension of dynamic viscosity is
ML^-1^T-1
L2T^-1
LT^-2
ML^-1T^-2
one fourth as that of A. A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and
viscosity 10 poise under Stoke's law. A particle B with diameter 20 microns settling
in the same oil will have a settling velocity
same as that of A.
one fourth as that of A.
twice as that of A.
four times as that of A.
all (a), (b) and (c) The pitot static tube does not measure the __________ pressure.
static
total
difference in static & dynamic
all (a), (b) and (c)
Stuvia 2026-2027
, Fluid Mechanics Exam Questions & Answers PDF | Complete Engineering Practice Test
Newtonion The fluid in which the shearing stress within it is proportional to the velocity gradient
across the sheared section, is called a __________ fluid.
Bingham
Newtonion
perfect
none of these
flow pressure approaches its vapor pressure at the In fluid flow, cavitation is caused, if the
prevailing temperature.
fluid velocity decreases to zero.
total energy decreases.
both (a) and (b).
flow pressure approaches its vapor pressure at the prevailing temperature.
2 The ratio of the depth of flow to the hydraulic radius for the most economical
trapezoidal section, in open channel flow is
0.5
1
1.5
2
0.44 The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the
following order of magnitude (assume size of the bacterium to be 1 micron and
kinematic viscosity of water to be 10-6m2/s).
24000
24
0.24
0.44
Vs/Dp^2 For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is
the superficial liquid velocity and Dp is the particle diameter)
Vs/Dp^2
Vs^2/Dp^2
Vs^2/Dp^3
Vs/Dp^3
1000 he maximum delivery pressure of compressors can be upto __________
atmospheres.
10
100
250
1000
FL^-1 Dimension of surface tension is(where, F = force, L = length)
FL^-1
F^-1 . L
F.L^-2
F^-2 . L
None of these Which of the following is not a dimension-less parameter ?
Euler number
Specific gravity
Fanning friction factor
None of these
more than Co-efficient of velocity is __________ the coefficient of discharge.
less than
more than
equal to
not related to
Stuvia 2026-2027
surface tension The fluid property, due to which, mercury does not wet the glass is
surface tension
viscosity
cohesion
adhesion
2100 Laminar flow of a Newtonion fluid ceases to exist, when the Reynolds number
exceeds
4000
2100
1500
3000
jet pump When the momentum of one fluid is used for moving another fluid, such a device is
called a/an
jet pump
blower
acid egg
none of these
having no motion of one fluid layer relative to the other. The normal stress is the same in all directions at a point in a fluid, when the fluid is
non-viscous.
incompressible.
both (a) and (b).
having no motion of one fluid layer relative to the other.
both (a) and (b) Head developed by a centrifugal pump depends on its
speed
impeller diameter
both (a) and (b)
neither (a) nor (b)
mean velocity Hydraulic mean depth (Dm) for a circular pipe of diameter 'D' flowing full is 0.25 D.
For a circular channel, at Dm = 0.3 D, gives the condition for the maximum
flow rate
mean velocity
both 'a' & 'b'
neither 'a' nor 'b'
as (velocity)^2 The head loss in turbulent flow in a pipe varies
as velocity
as (velocity)^2
inversely as the square of diameter
inversely as the velocity
sleevejoint Most commonly used joint in the underground pipe lines is the
sleevejoint
coupling
flange
expansion joint
1000 P'/S Schedule number of a pipe, which is a measure of its wall thickness, is given by
1000 P'/S
100 P'/S
1000 S/P'
10000 P'/S
Stuvia 2026-2027
, Fluid Mechanics Exam Questions & Answers PDF | Complete Engineering Practice Test
suction minus vapor pressure of the liquid at suction The net positive suction head (NPSH) of a centrifugal pump is defined as the sum of
temperature. the velocity head and the pressure head at the
discharge.
suction.
suction minus vapor pressure of the liquid at suction temperature.
discharge minus vapor pressure of the liquid at the discharge temperature.
monotonically decreases. With increasing flow rate, the hydraulic efficiency of a centrifugal pump
monotonically decreases.
decreases and then increases.
remains constant.
increases and then decreases.
logarithmic The velocity profile for turbulent flow through a closed conduit is
logarithmic
parabolic
hyperbolic
linear
friction co-efficient for flows at equal Reynold number. In case of hydraulically smooth pipe, the resistance to flow depends only on the
Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is
governed by the relative roughness. Two pipes are said to have the same hydraulic
roughness, when they have equal values of
relative roughness.
absolute roughness.
friction co-efficient for flows at equal Reynold number.
all (a), (b) & (c).
rapid pressure change due to a rapid change in the rate of Water hammer in a pipeline results from the
flow.
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.
centrifugal Molten soap mass is transported by a __________ pump.
diaphragm
reciprocating
gear
centrifugal
Mach number Which of the following denotes the effect of compressibility in fluid flow ?
Weber number
Mach number
Euler number
Reynolds number
smaller than Nominal size of the discharge pipe of a pump is usually __________ the nominal
size of the inlet pipe.
smaller than
larger than
same as
twice
inverse of the fluid viscosity. The terminal velocity of a small sphere settling in a viscous fluid varies as the
first power of its dimeter.
inverse of the fluid viscosity.
inverse square of the diameter.
square of the difference in specific weights of solid & fluid.
Stuvia 2026-2027
, Fluid Mechanics Exam Questions & Answers PDF | Complete Engineering Practice Test
increases If the discharge of a centrifugal pump is throttled, then its suction lift
increases
decreases
remains unchanged
data insufficient to predict
directional control Foot valves provided in pumps are __________ valves.
relief
three/four way
pressure reducing
directional control
inertial forces control and viscous forces are unimportant. At high Reynolds number
inertial forces control and viscous forces are unimportant.
viscous forces predominate.
inertial forces are unimportant and viscous forces control.
none of these.
more than Power loss in an orificemeter is __________ that in a venturimeter.
less than
same as
more than
data insufficient, cannot be predicted
0.5 The terminal velocity of a particle moving through a fluid varies as dpn. What is the
value of n' for Newton's law regime ?
0.5
1
1.5
3
7 to 15 What is the normal range of exit cone angle of a venturimeter ?
2 to 5
7 to 15
15 to 25
>25
ML^-1^T-1 The dimension of dynamic viscosity is
ML^-1^T-1
L2T^-1
LT^-2
ML^-1T^-2
one fourth as that of A. A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and
viscosity 10 poise under Stoke's law. A particle B with diameter 20 microns settling
in the same oil will have a settling velocity
same as that of A.
one fourth as that of A.
twice as that of A.
four times as that of A.
all (a), (b) and (c) The pitot static tube does not measure the __________ pressure.
static
total
difference in static & dynamic
all (a), (b) and (c)
Stuvia 2026-2027
, Fluid Mechanics Exam Questions & Answers PDF | Complete Engineering Practice Test
Newtonion The fluid in which the shearing stress within it is proportional to the velocity gradient
across the sheared section, is called a __________ fluid.
Bingham
Newtonion
perfect
none of these
flow pressure approaches its vapor pressure at the In fluid flow, cavitation is caused, if the
prevailing temperature.
fluid velocity decreases to zero.
total energy decreases.
both (a) and (b).
flow pressure approaches its vapor pressure at the prevailing temperature.
2 The ratio of the depth of flow to the hydraulic radius for the most economical
trapezoidal section, in open channel flow is
0.5
1
1.5
2
0.44 The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the
following order of magnitude (assume size of the bacterium to be 1 micron and
kinematic viscosity of water to be 10-6m2/s).
24000
24
0.24
0.44
Vs/Dp^2 For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is
the superficial liquid velocity and Dp is the particle diameter)
Vs/Dp^2
Vs^2/Dp^2
Vs^2/Dp^3
Vs/Dp^3
1000 he maximum delivery pressure of compressors can be upto __________
atmospheres.
10
100
250
1000
FL^-1 Dimension of surface tension is(where, F = force, L = length)
FL^-1
F^-1 . L
F.L^-2
F^-2 . L
None of these Which of the following is not a dimension-less parameter ?
Euler number
Specific gravity
Fanning friction factor
None of these
more than Co-efficient of velocity is __________ the coefficient of discharge.
less than
more than
equal to
not related to
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