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Which of the following valves will incur maximum pressure drop for the same discharge of water
globe valve
needle valve
Butterfly valve
gate valve
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
Capillary tube method of viscosity measurement is based on the
Navier-stokes equation
NONE OF THESE
Stoke's law
Hagen-Poiseulle's equation
For steady ideal fluid flow, the Bernoulli's equation states that the
energy is constant throughout the fluid
NONE OF THESE
velocity is constant along a stream line.
energy is constant along a stream line, but may vary across stream lines
Two dimensional stream function
is constant along a stream line.
is constant along an equipotential surface.
None of these.
relates velocity and pressure.
In power law, , then the fluid is
rheopectic
dilatant
newtonian
thixotropic
The time taken for gravity flow of a fixed volume of liquid
(as in Redwood viscometer) is directly proportional to its
density.
Reynolds number.
ratio of absolute viscosity to density.
absolute viscosity.
In centrifugal pump operation, the cavitation can be eliminated by maintaining suction pressure __________ the vapor pressure of the liquid at the suction temperature
Equal to
NONE OF THESE
higher than
lower than
__________ forces act on a particle moving through a stationary fluid
Gravity
Buoyant
all (a), (b), & (c)
drag
In case of a centrifugal pump, the theoretical head developed is dependent on the __________ the impeller
All (A), (B) and (C)
speed of
fluid velocity leaving
diameter of
A fluid which has a linear relationship between the magnitude of applied shear-stress and the resulting rate of deformation is called a/an __________ fluid
incompressible
Newtonion
Ideal
non-Newtonion
An ideal plastic substance indicates no deformation, when stressed upto yield stress, but behaves like a Newtonion fluid beyond yieldstress.
Which of the following is an ideal plastic
Rubber latex
Blood
Sewage sludge
sugar solution
Check valve is used for __________ flow
very precise control of
NONE OF THESE
Unidirectional
Multidirectional
The boundary layer thickness at a given section along a flat plate __________ with increasing Reynold's number
Remains same
May increase or decrease
Decreases
Increases
Choose the set of pressure intensities that are equivalent
10 psi, 19.7 ft. of water, 23.3 inches of Hg.
4.33 psi, 10 ft. of water, 20.7 inches of Hg.
10 psi, 19.7 ft. of water, 5.3 inches of Hg.
4.33 psi, 10 ft. of water, 8.83 inches of Hg.
Euler's equation of motion states, that at every point, the
None of these.
rate of mass outflow is equal to the rate of mass inflow.
force per unit mass equals acceleration.
fluid momentum is constant.
For an unstable equilibrium of a floating body (where, M =metacentre.
)
M & G coincide
M is below G
NONE OF THESE
M is above G
A rotameter works on the principle of __________ pressure drop
constant
Neither (A) Nor (B)
Both (a) & (b)
Variable
Curve III in the above diagram represents a/an
dilatent fluid
ideal plastic
NONE OF THESE
pseudo plastic fluid
The terminal velocity of a particle moving through a fluid varies asdpn.
The value of n is equal to __________ in Stoke's law regime
2
1.5
0.5
1
1
2
18
36
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