Q.1
Curve III in the above diagram represents a/an
Q.2
A hydraulic ram acts as a/an __________ pump.
Q.3
N²Re/NFr is called the __________ number.
Q.4
The ratio of inertial forces to gravity forces is called the __________ number.
Q.5
Cavitation in a centrifugal pump can be avoided by keeping the
Q.6
Which of the following must be followed by the flow of a fluid (real or ideal)?
(I) Newton's law of viscosity.
(II) Newton's second law of motion.
(III) The continuity equation.
(IV) Velocity of boundary layer must be zero relative to boundary.
(V) Fluid cannot penetrate a boundary.
Q.7
For an incompressible fluid, the bulk modulus of elasticity is
Q.8
Very small pressure difference (< 5 mm water coloumn) can be most conveniently measured by a/an __________ manometer.
Q.9
For pipes that must be broken at intervals for maintenance, the connector used should be a/an
Q.10
With the increase in depth, the hydrostatic pressure in an unaccelerated incompressible fluid (in a constant gravitational field)
Q.11
Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an
Q.12
Pressure drop (Δp) for a fluid flowing in turbulent flow through a pipe is a function of velocity (V) as
Q.13
__________ pump is the most suitable device for discharging a liquid against a pressure of ≥ 1500 kgf/cm².
Q.14
Pressure drop in a fluidised bed reactor is __________ that in a similar packed bed reactor.
Q.15
The capacity of an accumulator is the maximum
Q.16
The inherent characteristic of an equal percentage valve relating flow rate 'q' with valve stem movement 'x' are described by the equation
Q.17
What is the value of Fanning friction factor f ' for smooth pipe at NRe = 10⁶ approximately?
Q.18
The ratio of pressure forces to inertial forces is called the __________ number.
Q.19
Cavitation in a centrifugal pump results from
Q.20
Velocity of liquid hydrocarbon fuels in a pipeline can not be measured by magnetic flowmeters, because their __________ is very low/small.
Q.21
For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance).
Q.22
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.
Q.23
The terminal velocity of a small sphere settling in a viscous fluid varies as the
Q.24
Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, σ = surface tension of mercury)
Q.25
What is the force required (in Newtons) to hold a spherical balloon stationary in water at a depth of H from the air-water iterface? The balloon is of radius 0.1 m and is filled with air.
Q.26
With increase in molecular weight of the gas, the head developed by a centrifugal compressor will
Q.27
The capillary rise of mercury is maximum in glass tube of dia __________ mm.
Q.28
The frictional resistance in laminar flow does not depend on the
Q.29
A Newtonion liquid (ρ = density, μ = viscosity) is flowing with velocity v in a tube of diameter 'D'. Let Δp be the pressure drop across the length 'L'. For a laminar flow, Δp is proportional to
Q.30
The pitot static tube does not measure the __________ pressure.
Q.31
Manometers measure the __________ pressure.
Q.32
Maximum theoretical suction lift for water at 15°C by a centrifugal pump is 34 ft. The same for water at 90°C will be __________ ft.
Q.33
At low Reynolds number
Q.34
Viscosity of water is about __________ times that of air at room temperature.
Q.35
A rotameter works on the principle of __________ pressure drop.
Q.36
The continuity equation of fluid mechanics utilises the principle of conservation of
Q.37
Most of the centrifugal pumps used in chemical plants are usually __________ driven.
Q.38
In case of coutte flow, the fluid flow is between two large flat parallel plates with
Q.39
An ideal fluid is
Q.40
An ideal nozzle design aims at
Q.41
At high Reynolds number
Q.42
The actual velocity at vena-contracta for flow through an orifice from a reservoir is given by
Q.43
If 'x' is the depth of flow in an open channel of large width, then the hydraulic radius is equal to
Q.44
In the laminar boundary layer flow over a flat plate, the ratio (δ/x) varies as :(where, 'δ' is the boundary layer thickness and 'x' is the distance from the leading edge in the direction of flow).
Q.45
Hydraulic radius is the ratio of
Q.46
The most important factor, which determines the maximum height to which water can be lifted by a pump at standard temperature is the
Q.47
Euler's equation of motion states, that at every point, the
Q.48
Which of the fluid forces are not considered in the Reynold's equation of flow?
Q.49
A Bingham fluid of viscosity μ = 10 Pa.s and yield stress, τ₀ = 10 KPa, is shared between flat parallel plates separated by a distance of 10⁻³ m. The top plate is moving with a velocity of 1 m/s. The shear stress on the plate is
Q.50
Capacity of a rotary gear pump can be varied by
0 h : 0 m : 1 s