Q.1
In case of turbulent flow of a Newtonion fluid in a straight pipe, the maximum velocity is equal to (where, Vavg = average fluid velocity)
Q.2
For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is the superficial liquid velocity and Dp is the particle diameter)
Q.3
The equation given below is called the __________ .
f-0.5 = 4.07 loge (NRe√f)-0.6
Q.4
Which of the following exemplifies a three dimensional fluid flow ?
Q.5
The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is
Q.6
For water, when the pressure increases, the viscosity
Q.7
The lift of a ballon is
Q.8
The blades of a centrifugal impeller are said to be curved forward, if the __________ of the motion of impeller blades.
Q.9
In an incompressible flow of fluid, the fluid
Q.10
The dimension of kinematic viscosity is
Q.11
The temperature in isentropic flow
Q.12
The velocity profile exhibited by laminar flow of Newtonion fluids is such that the velocity distribution w.r.t. radius of the circular pipe is a/an __________ with the apex at the centre line of the pipe.
Q.13
Which of the following is not a dimension-less parameter?
Q.14
The fluid velocity varies as the square root of the cylindrical pipe diameter in case of steady state laminar flow at constant pressure drop fo __________ fluid.
Q.15
Boundary layer thickness in laminar flow over a flat plate increases as(where, d = distance from the leading edge.)
Q.16
Boundary layer thickness in turbulent flow over a flat plate increases as(where, d = distance from the leading edge.)
Q.17
Dimension of kinematic viscosity is
Q.18
The drag co-efficient for a bacterium moving in water at 1 mm/s, will be of the following order of magnitude (assume size of the bacterium to be 1 micron and kinematic viscosity of water to be 10⁻⁶m²/s).
Q.19
The unit of bulk modulus of elasticity for a liquid in S.I. unit is
Q.20
The most suitable flow measuring device for the fluid flow measurement in a very large diameter pipeline is a
Q.21
Slurries can be most conveniently pumped by a __________ pump.
Q.22
If two capillary tubes of dia 0.5 mm and 1 mm are dipped in a pot containing mercury, then the rise of mercury is
Q.23
Boundary layer separation occurs when the
Q.24
Steady flow occurs, when the
Q.25
Vane anemometer
Q.26
If three pipes of different diameters, lengths & friction factors are connected in parallel, then (where, Q = flow rate, V= fluid velocity f = friction factor).
Q.27
The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stoke's law range is proportional to the
Q.28
Cd is always __________ Cc.
Q.29
Velocity distribution for flow between two fixed parallel plates
Q.30
The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is
Q.31
Medium viscosity lubricating oil can be most ideally pumped by a __________ pump.
Q.32
Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will
Q.33
A stream line is
Q.34
The unit of dynamic viscosity in SI unit is
Q.35
The value of critical Reynolds number for pipe flow is
Q.36
Reynolds number for flow of water at room temperature through 2 cm dia pipe at an average velocity of 5 cm/sec is around
Q.37
A double acting reciprocating pump compared to a single acting pump (of almost same size working under same pressure levels) would give almost double
Q.38
A fluid is pumped at the rate of 10 lb/sec to a height of 55 ft. The horse power required is __________ hp.
Q.39
In case of hydraulically smooth pipe, the resistance to flow depends only on the Reynolds number, whereas for a hydraulically rough pipe, the resistance to flow is governed by the relative roughness. Two pipes are said to have the same hydraulic roughness, when they have equal values of
Q.40
The most economical flow control valve for use with large diameter pipes is a
Q.41
Which law/principle of solid mechanics is similar/equivalent to Newton's law of viscosity in fluid mechanics?
Q.42
The hydrodynamic and thermal boundary layers will merge, when
Q.43
The head loss in turbulent flow in a pipe varies
Q.44
A 2" gate valve fitted in a pipe is replaced by a similar globe valve. Pressure drop in gate valve was Δp. For the same discharge, the pressure drop across globe valve is
Q.45
Volute type of casing is provided in a centrifugal pump to
Q.46
Two dimensional stream function
Q.47
Rubber latex is an example of a __________ .fluid.
Q.48
What causes cavitation in centrifugal pump?
Q.49
For a stable equilibrium of a submerged body (where, G and B are centres of gravity & buoyancy respectively).
Q.50
The variable required to be known in correlations used for estimating the horse power of a centrifugal gas compressor and hence its cost are P. Inlet pressure Q. Compressor rpm R. Delivery pressure S. Volumetric flow rate at inlet.
0 h : 0 m : 1 s