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Fluid Mechanics

Fluid Mechanics
The resistance wire used in a hot wire anemometer for conducting electrical current is made of

Aluminium
Chromium
Tungsten
Copper

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Fluid Mechanics
Permanent pressure loss in a well designed venturimeter is about __________ percent of the venturi differential.

50
10
1
30

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Fluid Mechanics
Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg.

0.1
0.001
0.01
1

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Fluid Mechanics
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

60
90
45
30

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Fluid Mechanics
For water, when the pressure increases, the viscosity

Remains constant
Also increases
Decreases
First decreases, and then increases

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Fluid Mechanics
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.

Transition
Equivalent
None of these
Prandtl mixing

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