Froude number is the ratio of
A. Shear stress to gravitational stress
B. Drag stress to shear stress
C. Inertial stress to shear stress
D. Inertial stress to gravitational stress
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Applicability of Bernoulli's equation is limited to a/an __________ fluid, that does not exchange shaft work with the surroundings.
A. Incompressible
B. Non-viscous
C. Both A and B
D. Neither A nor B
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Disc compensators are provided in large diameter fuel gas carrying pipelines to
A. Keep the pipe in proper orientation
B. Make the pipe joint leak-proof
C. Account for contraction/expansion of pipe due to temperature changes of the surroundings
D. Account for the pressure variation side the pipeline
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During ageing of fluid carrying pipes, the
A. Pipe becomes smoother with use
B. Friction factor increases linearly with time
C. Absolute roughness decreases with time
D. Absolute roughness increases linearly with time
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A gas (density = 1.5 kg/m3 , viscosity = 2 × 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 1.5 kg/m3 and viscosity of 3 × 10-5 kg/m.s flowing at 3 m/s will be
A. 8400 Pa/m
B. 12600 Pa/m
C. 18900 Pa/m
D. 16800 Pa/m
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Centrifugal pump can't be used to pump
A. Molten sodium (used as a coolant in Fast Breeder Reactor)
B. Moderately viscous vegetable oil used in soap industry
C. Thick molten soap at 80°C
D. None of the above
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The general relationship between speed N, head H, power P and discharge Q for a centrifugal pump is
A. Q ∝ N : H ∝ N2 : P ∝ N3
B. Q ∝ N2 : H ∝ N3 : P ∝ N
C. Q ∝ N : H ∝ N3 : P ∝ N2
D. Q ∝ N3 : H ∝ N : P ∝ N2
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The percentage slip in a reciprocating pump set is given by the % of (where, Q1 = actual discharge Q2 = theoretical discharge)
A. Q 2 Q 1
B. Q 1 Q 2
C. Q 1 Q 2 − Q 1
D. Q 2 Q 2 − Q 1
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What is the shear rate at the pipe wall, in case of laminar flow of Newtonion fluids in a pipe of diameter 'D' & length 'L' incurring a pressure drop 'Δp' with average velocity 'Vavg '?
A. D Δp/8L
B. D Δp/4L
C. 8 . Vavg /D
D. 4 . Vavg /D
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Gear pump
A. Is a positive displacement pump
B. Is a centrifugal pump
C. Is a non-positive displacement pump
D. Can be started with delivery valve closed
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The discharge through a venturimeter depends upon
A. Pressure drop only
B. Its orientation
C. Co-efficient of contraction only
D. None of these
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Surge tanks are provided in high pressure water pipelines to
A. Store a definte quantity ofwater all the time
B. Reduce the water hammer
C. Facilitate easy dismantling of pipeline for cleaning and maintenance
D. None of these
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Glass pipes can be joined by
A. Flanges
B. Welding
C. Soldering
D. Bell and spigot joint
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The maximum head that can be developed by a single impeller is __________ ft.
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Diaphragm pumps are used to transport
A. Solids
B. Liquids
C. Fluids
D. Slurries
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Pick out the correct statement pertaining to the flow through a converging-diverging tube.
A. The value of Mach number is always unity at the throat
B. No shock wave develops in the tube when the Mach number at exit is greater than unity
C. Throughout the converging portion of the tube, the density increases in the downstream direction
D. None of these
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The discharge through a rectangular weir varies as
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The boundary layer thickness at a given section along a flat plate __________ with increasing Reynold's number.
A. Increases
B. Decreases
C. Remains same
D. May increase or decrease
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The line of action of the buoyant force passes through the centre of gravity of the
A. Submerged body
B. Displaced volume of the fluid
C. Volume of fluid vertically above the body
D. Horizontal projection of the body
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The ratio of the depth of flow to the diameter of the channel for maximum discharge in a circular channel in open channel flow is
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