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