1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m² and the overall heat transfer co-efficient to the liquid is 1500 W/m².°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be

Heat Transfer
1000 Kg of liquid at 30°C in a well stirred vessel has to be heated to 120°C, using immersed coils carrying condensing steam at 150°C. The area of the steam coils is 1.2 m² and the overall heat transfer co-efficient to the liquid is 1500 W/m².°C. Assuming negligible heat loss to the surrounding and specific heat capacity of the liquid to be 4 kJ/kg.°C, the time taken for the liquid to reach desired temperature will be

44 min

51 min

22 min

15 min

44 min

51 min

22 min

15 min

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Heat Transfer
An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is

9000

4600

4000

3000

9000

4600

4000

3000

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Heat Transfer
If Prandtl number is greater than the Schmidt number, then the

thermal & concentration boundary layers are of equal thickness

none of the listed here

concentration boundary layer lies inside the thermal boundary layer

thermal boundary layer lies inside the concentration boundary layer

thermal & concentration boundary layers are of equal thickness

none of the listed here

concentration boundary layer lies inside the thermal boundary layer

thermal boundary layer lies inside the concentration boundary layer

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Heat Transfer
For flow over a flat plate, the ratio of thermal boundary layer thickness, 'xt' and hydrodynamic boundary layer thickness 'x' is equal to (where, NPr = Prandtl number)

NPr

NPr-1

NPr-1/3

NPr1/3

NPr

NPr-1

NPr-1/3

NPr1/3

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Heat Transfer
Which of the following is not used as a medium for high temperature heating ?

liquid metal

dowtherm

mercury

None of the listed here

liquid metal

dowtherm

mercury

None of the listed here

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Heat Transfer
For an ideal black body

Transmissivity = 1

Absorptivity = 1

Reflectivity = 1

Emissivity = 0

Transmissivity = 1

Absorptivity = 1

Reflectivity = 1

Emissivity = 0

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Heat Transfer

Heat Transfer An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is

Heat Transfer If Prandtl number is greater than the Schmidt number, then the

Heat Transfer For flow over a flat plate, the ratio of thermal boundary layer thickness, 'xt' and hydrodynamic boundary layer thickness 'x' is equal to (where, NPr = Prandtl number)

Heat Transfer Which of the following is not used as a medium for high temperature heating ?

Heat Transfer For an ideal black body

Heat Transfer
An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is

Heat Transfer
If Prandtl number is greater than the Schmidt number, then the

Heat Transfer
For flow over a flat plate, the ratio of thermal boundary layer thickness, 'xt' and hydrodynamic boundary layer thickness 'x' is equal to (where, NPr = Prandtl number)

Heat Transfer
Which of the following is not used as a medium for high temperature heating ?

Heat Transfer
For an ideal black body