Heat Transfer

461. Which is the most suitable for the concert-ration of highly concentrated solution?

1. Open pan evaporation
2. Long tube vertical evaporator
3. Agitated film evaporator
4. None of these

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462. Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid?

1. Bleed point
2. Vent
3. Catchall
4. Baffle

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463. Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids?

1. Dittus-Boelter equation
2. Sieder-Tate equation
3. Nusselt equation
4. None of these

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464. Which of the following has maximum thermal conductivity?

1. Iron
2. Coal
3. Nitrogen
4. Tar

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465. Which of the following has the highest thermal conductivity?

1. Brick
2. Air
3. Water
4. Silver

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466. Which of the following has the lowest overall heat transfer co-efficient?

1. Dowtherm
2. Molten sodium
3. Water
4. Air

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467. Which of the following has the lowest Prandtl number?

1. Molten sodium (a coolant used in fast breeder reactor)
2. Water
3. Transformer oil
4. Dilute h₂SO4

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468. Which of the following has the minimum absorptivity?

1. Aluminium foil
2. Coal dust
3. Refractory bricks
4. Iron plates

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469. Which of the following has the minimum thermal conductivity?

1. Nitrogen
2. Steel
3. Carbon black
4. Tar

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470. Which of the following is concerned with both heat and mass transfer?

1. Lewis relationship
2. Nusselt number
3. Kutateladze number
4. Froude number

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