The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K₀ + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be

Heat Transfer
The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K₀ + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be

W/m.k

None, A is just a number

W/m.k²

W/m

W/m.k

None, A is just a number

W/m.k²

W/m

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Heat Transfer
In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always

1

< 1

∞

> 1

1

< 1

∞

> 1

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Heat Transfer
In a laboratory test run, the rate of drying was found to be 0.5 x 10-3 kg/m².s, when the moisture content reduced from 0.4 to 0.1 on dry basis. The critical moisture content of the material is 0.08 on a dry basis. A tray dryer is used to dry 100 kg (dry basis) of the same material under identical conditions. The surface area of the material is 0.04 m²/kg of dry solid. The time required (in seconds) to reduce the moisture content of the solids from 0.3 to 0.2 (dry basis) is

5000

2000

6000

4000

5000

2000

6000

4000

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Heat Transfer
Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator?

Horizontal tube evaporator

Calenderia vertical tube evaporator

Long vertical evaporator

Agitated film evaporator

Horizontal tube evaporator

Calenderia vertical tube evaporator

Long vertical evaporator

Agitated film evaporator

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Heat Transfer
Solid angle subtended by the finite surface at the radiating element is

called the angle of vision

called the view factor.

expressed in terms of radians

proportional to the square of the distance between surfaces

called the angle of vision

called the view factor.

expressed in terms of radians

proportional to the square of the distance between surfaces

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Heat Transfer
In a single effect evaporator, the economy is

< 1

> 1

1

None of these

< 1

> 1

1

None of these

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Heat Transfer

Heat Transfer The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K₀ + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be

Heat Transfer In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always

Heat Transfer Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator?

Heat Transfer Solid angle subtended by the finite surface at the radiating element is

Heat Transfer In a single effect evaporator, the economy is

Heat Transfer
The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K₀ + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of 'a' in SI system will be

Heat Transfer
In a liquid-liquid heat exchanger, for the same process temperature, the ratio of the LMTD in parallel flow to the LMTD in counter flow is always

Heat Transfer
Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator?

Heat Transfer
Solid angle subtended by the finite surface at the radiating element is

Heat Transfer
In a single effect evaporator, the economy is