Q.1
For the production of very high vacuum, a __________ pump is normally used.
Q.2
Drag co-efficient in hindered settling is __________ that in free settling.
Q.3
Centre of pressure in an immersed body is __________ the centre of gravity.
Q.4
Disc compensators are provided in large diameter fuel gas carrying pipelines to
Q.5
During ageing of fluid carrying pipes, the
Q.6
The uniformity of a gas fluidised bed depends upon the __________ of the solid particles.
Q.7
The __________ pressure is measured by a static tube.
Q.8
Boiler feed water pump is usually a __________ pump.
Q.9
A gas (density = 1.5 kg/m³ , viscosity = 2x 10⁻⁵ kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The pressure drop for another gas, with density of 1.5kg/m³and viscosity of 3 x 10⁻⁵kg/m.s flowing at 3 m/s will be
Q.10
Velocity at a certain point in case of streamline flow is
Q.11
Bed pressure drop in an air fluidised bed of catalyst particles (ρp = 200 kg/m³, Dp = 0.05 cm) of 60 cm bed depth and bed porosity of 0.5 expressed in cm of water (manometer) is
Q.12
In which type of fluid flow, the velocity of flow of fluid changes from point to point in the fluid at any instant?
Q.13
Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is
Q.14
If the head over the triangular notch is doubled, the discharge will increase by __________ times.
Q.15
Which of the following pipe bends will incur the largest head loss ?
Q.16
Which of the following has the minimum compressibility?
Q.17
Interstage coolers are provided in a multistage compressor to
Q.18
Purpose of relief valve in a reciprocating pump is to
Q.19
The resistance wire used in a hot wire anemometer for conducting electrical current is made of
Q.20
Liquid delivery by centrifugal pump starts, only when the head developed by it is equal to the __________ head.
Q.21
The Mach number for hypersonic flow of compressible fluid is
Q.22
Shear stress in a fluid flowing in a round pipe
Q.23
Select the wrong statement pertaining to flow of an incompressible fluid through a venturimeter.
Q.24
Function of air vessel provided in a reciprocating pump is to
Q.25
The speed of sound in an ideal gas varies as the
Q.26
The energy loss in flow through ven-turimeter is less than that through flow nozzle, because in case of a flow nozzle, the
Q.27
Which of the following produces maximum pressure difference for transportation of gases?
Q.28
A centrifugal pump is used to pump water through a horizontal distance of 150 m, and then raised to an overhead tank 10 m above. The pipe is smooth with an I.D of 50 mm. What head (m of water) must the pump generate at its exit (E) to deliver water at a flow rate of 0.001 m³/s? The Fanning friction factor, f is 0.0062.
Q.29
While starting a centrifugal pump, its delivery valve should be kept
Q.30
Which of the following is used for very accurate measurement of flow of gas at low velocity?
Q.31
For laminar flow through a closed conduit
Q.32
Two fluids are flowing through two similar pipes of the same diameter. The Reynold's number is same. For the same flow rate if the viscosity of a fluid is reduced to half the value of the first fluid, the pressure drop will
Q.33
A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun's equation for the above fluid-particle system (in SI units) is given below :
Δ P/L = 375 x 10³ VOM + 10.94 x 10⁶ V²OM (SI units)
If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is
Q.34
The nominal size of a hose pipe is specified by its
Q.35
Rise of liquid in a capillary tube is due to
Q.36
While starting an axial flow pump, its delivery valve should be kept
Q.37
Pressure drag does not depend upon the
Q.38
The length of the tube necessary for the boundary layer to reach the centre of the tube and for fully developed flow to be established is called the __________ length.
Q.39
The ratio of inertial forces to elastic forces is called the __________ number.
Q.40
Ratio of inertial forces to surface tension forces is called the __________ number.
Q.41
The ratio of inertial forces to viscous forces is called the __________ number.
Q.42
For an unstable equilibrium of a floating body (where, M = metacentre.)
Q.43
Drag force acting on a body does not depend upon the
Q.44
A venturimeter can not be used for the direct measurement of
Q.45
The normal stress is the same in all directions at a point in a fluid, when the fluid is
Q.46
Reciprocating pumps compared to centrifugal pumps
Q.47
Mass velocity in case of steady flow and through a constant cross-section conduit is independent of the
Q.48
The equivalent diameter for pressure drop calculation for a duct of square cross-section is given by(where, x = each side of the square duct)
Q.49
Which of the following is the most common pump for pumping either raw sewage or sludge?
Q.50
Priming of a centrifugal pump is done to
0 h : 0 m : 1 s