Fluid Mechanics

401.Pressure drop for laminar fluid flow through a circular pipe is given by

1. 4f (L/D) (v²/2g_c) ρ
2. 32 (μLV/g_c d²)
3. 16/N_Re
4. (fLρ/D) (v²/2g_c)

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402.Pressure drop for turbulent fluid flow through a circular pipe is given by

1. 64/R_e
2. 32μLV/g_c.d²
3. 4f (L/D) (v²/2g_c). ρ
4. f (L/D) (v²/2g_c). ρ

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403.Pressure drop in a fluidised bed reactor is _________ that in a similar packed bed reactor.

1. Less than
2. Greater than
3. Same as
4. None of these

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404.Pressure drop in a packed bed for laminar flow is given by the _________ equation.

1. Kozeny-Carman
2. Blake-Plummer
3. Leva's
4. Fanning friction factor

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405.Pressure drop in packed bed for turbulent flow is given by the _________ equation.

1. Kozeny-Carman
2. Blake-Plummer
3. Leva's
4. Hagen-Poiseuille’s

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406.Priming is needed in a _________ pump.

1. Reciprocating
2. Gear
3. Centrifugal
4. Diaphragm

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407.Priming of a centrifugal pump is done to

1. Increase the mass flow rate of fluid
2. Develop effective pressure rise by the pump
3. Avoid chances of separation inside the impeller
4. None of these

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408.Propeller type centrifugal pumps are most suitable for

1. High capacity at high heads
2. High capacity at low heads
3. Low capacity at high heads
4. Low capacity at low heads

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409.Propellers are

1. Axial flow mixers
2. Low speed impeller
3. Used for mixing liquids of high viscosity
4. Radial flow mixers

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410.Pump used for the transportation of molten sodium in a fast breader reactor is a/an _________ pump.

1. Reciprocating
2. Plunger
3. Electromagnetic
4. Gear

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