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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
larger than
smaller 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
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 an equipotential surface.
relates velocity and pressure.
is constant along a stream line.
None of these.
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
absolute viscosity.
ratio of absolute viscosity to density.
density.
Reynolds number.
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
Equal to
higher than
lower than
__________ forces act on a particle moving through a stationary fluid
Buoyant
all (a), (b), & (c)
Gravity
drag
In case of a centrifugal pump, the theoretical head developed is dependent on the __________ the impeller
speed of
All (A), (B) and (C)
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
Ideal
Newtonion
incompressible
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
Sewage sludge
sugar solution
Blood
Rubber latex
Check valve is used for __________ flow
Unidirectional
NONE OF THESE
very precise control of
Multidirectional
The boundary layer thickness at a given section along a flat plate __________ with increasing Reynold's number
Remains same
May increase or decrease
Increases
Decreases
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
None of these.
force per unit mass equals acceleration.
fluid momentum is constant.
rate of mass outflow is equal to the rate of mass inflow.
For an unstable equilibrium of a floating body (where, M =metacentre.
)
M & G coincide
NONE OF THESE
M is below G
M is above G
A rotameter works on the principle of __________ pressure drop
Both (a) & (b)
Variable
constant
Neither (A) Nor (B)
Curve III in the above diagram represents a/an
pseudo plastic fluid
ideal plastic
dilatent fluid
NONE OF THESE
The terminal velocity of a particle moving through a fluid varies asdpn.
The value of n is equal to __________ in Stoke's law regime
1.5
2
0.5
1
1
2
18
36
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