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