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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
same as
Twice
larger than
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
velocity is constant along a stream line.
energy is constant throughout the fluid
energy is constant along a stream line, but may vary across stream lines
NONE OF THESE
Two dimensional stream function
None of these.
is constant along a stream line.
is constant along an equipotential surface.
relates velocity and pressure.
In power law, , then the fluid is
dilatant
rheopectic
newtonian
thixotropic
The time taken for gravity flow of a fixed volume of liquid
(as in Redwood viscometer) is directly proportional to its
Reynolds number.
absolute viscosity.
density.
ratio of absolute viscosity to density.
In centrifugal pump operation, the cavitation can be eliminated by maintaining suction pressure __________ the vapor pressure of the liquid at the suction temperature
lower than
Equal to
NONE OF THESE
higher than
__________ forces act on a particle moving through a stationary fluid
all (a), (b), & (c)
drag
Gravity
Buoyant
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
Ideal
Newtonion
non-Newtonion
incompressible
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
sugar solution
Rubber latex
Sewage sludge
Blood
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
Decreases
Increases
May increase or decrease
Choose the set of pressure intensities that are equivalent
4.33 psi, 10 ft. of water, 20.7 inches of Hg.
4.33 psi, 10 ft. of water, 8.83 inches of Hg.
10 psi, 19.7 ft. of water, 5.3 inches of Hg.
10 psi, 19.7 ft. of water, 23.3 inches of Hg.
Euler's equation of motion states, that at every point, the
force per unit mass equals acceleration.
fluid momentum is constant.
rate of mass outflow is equal to the rate of mass inflow.
None of these.
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
Both (a) & (b)
Variable
constant
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
1.5
1
2
0.5
1
2
18
36
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