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Which of the following valves will incur maximum pressure drop for the same discharge of water
Butterfly valve
gate valve
needle valve
globe valve
Nominal size of the discharge pipe of a pump is usually __________ the nominal size of the inlet pipe
Twice
larger than
smaller than
same as
Capillary tube method of viscosity measurement is based on the
Hagen-Poiseulle's equation
NONE OF THESE
Navier-stokes equation
Stoke's law
For steady ideal fluid flow, the Bernoulli's equation states that the
energy is constant throughout the fluid
velocity is constant along a stream line.
energy is constant along a stream line, but may vary across stream lines
NONE OF THESE
Two dimensional stream function
relates velocity and pressure.
is constant along an equipotential surface.
is constant along a stream line.
None of these.
In power law, , then the fluid is
dilatant
thixotropic
newtonian
rheopectic
The time taken for gravity flow of a fixed volume of liquid
(as in Redwood viscometer) is directly proportional to its
Reynolds number.
ratio of absolute viscosity to density.
absolute viscosity.
density.
In centrifugal pump operation, the cavitation can be eliminated by maintaining suction pressure __________ the vapor pressure of the liquid at the suction temperature
higher than
Equal to
lower than
NONE OF THESE
__________ forces act on a particle moving through a stationary fluid
Gravity
drag
all (a), (b), & (c)
Buoyant
In case of a centrifugal pump, the theoretical head developed is dependent on the __________ the impeller
speed of
fluid velocity leaving
diameter of
All (A), (B) and (C)
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
Newtonion
incompressible
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
Blood
Rubber latex
Sewage sludge
sugar solution
Check valve is used for __________ flow
Unidirectional
very precise control of
Multidirectional
NONE OF THESE
The boundary layer thickness at a given section along a flat plate __________ with increasing Reynold's number
Remains same
Increases
Decreases
May increase or decrease
Choose the set of pressure intensities that are equivalent
4.33 psi, 10 ft. of water, 8.83 inches of Hg.
10 psi, 19.7 ft. of water, 23.3 inches of Hg.
10 psi, 19.7 ft. of water, 5.3 inches of Hg.
4.33 psi, 10 ft. of water, 20.7 inches of Hg.
Euler's equation of motion states, that at every point, the
fluid momentum is constant.
rate of mass outflow is equal to the rate of mass inflow.
force per unit mass equals acceleration.
None of these.
For an unstable equilibrium of a floating body (where, M =metacentre.
)
M is below G
NONE OF THESE
M is above G
M & G coincide
A rotameter works on the principle of __________ pressure drop
Neither (A) Nor (B)
Both (a) & (b)
Variable
constant
Curve III in the above diagram represents a/an
pseudo plastic fluid
ideal plastic
NONE OF THESE
dilatent 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
1.5
0.5
1
2
18
36
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