Chemical Heat Transfer Archives

Water is normally used as a coolant in the heat exchange equipments mainly because of its___________________?

Water is normally used as a coolant in the heat exchange equipments mainly because of its___________________?

A. Abundance & high heat capacity
B. Low density
C. Low viscosity
D. High fluidity

Water is normally used as a coolant in the heat exchange equipments mainly because of its___________________? Read More »

Chemical Heat Transfer

Stefan-Boltzmann law applies to _____________ body?

Chemical Heat Transfer / admin

Stefan-Boltzmann law applies to _____________ body?

A. Black
B. White
C. Grey
D. Any colour

Stefan-Boltzmann law applies to _____________ body? Read More »

Chemical Heat Transfer

A BTU/hr.ft.2 °F is equal to_________________?

Chemical Heat Transfer / admin

A BTU/hr.ft.2 °F is equal to_________________?

A. 1 kcal/hr. m2°C
B. 4.88 kcal/hr. m.2°C
C. 1 kcal/hr. m2.°K
D. None of these

A BTU/hr.ft.2 °F is equal to_________________? Read More »

Chemical Heat Transfer

A _____________ evaporator employs an annular downtake?

Chemical Heat Transfer / admin

A _____________ evaporator employs an annular downtake?

A. Basket type
B. Horizontal
C. Long tube vertical
D. None of these

A _____________ evaporator employs an annular downtake? Read More »

Chemical Heat Transfer

With increase in temperature, the thermal conductivity of fresh lubricating oil ___________________?

Chemical Heat Transfer / admin

With increase in temperature, the thermal conductivity of fresh lubricating oil ___________________?

A. Increases
B. Decreases
C. Remains unchanged
D. May increase or decrease; depends on its composition

With increase in temperature, the thermal conductivity of fresh lubricating oil ___________________? Read More »

Chemical Heat Transfer

To reduce the tube side pressure drop for the same flow rate, the heat exchanger recommended is _______________?

Chemical Heat Transfer / admin

To reduce the tube side pressure drop for the same flow rate, the heat exchanger recommended is _______________?

A. 1-2 heat exchanger
B. 1-1 heat exchanger
C. 3-2 heat exchanger
D. 2-4 heat exchanger

To reduce the tube side pressure drop for the same flow rate, the heat exchanger recommended is _______________? Read More »

Chemical Heat Transfer

In case of _______________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface?

Chemical Heat Transfer / admin

In case of _______________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface?

A. Nucleate
B. Local
C. Pool
D. Saturated

In case of _______________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface? Read More »

Chemical Heat Transfer

For _______________ Prandtl number values, the heat conduction will be negligible in the buffer zone?

Chemical Heat Transfer / admin

For _______________ Prandtl number values, the heat conduction will be negligible in the buffer zone?

A. Extremely low
B. Low
C. High
D. No

For _______________ Prandtl number values, the heat conduction will be negligible in the buffer zone? Read More »

Chemical Heat Transfer

Terminal point temperature differences between fluids in case of a heat exchanger is termed as__________________?

Chemical Heat Transfer / admin

Terminal point temperature differences between fluids in case of a heat exchanger is termed as__________________?

A. Approach
B. Log mean temperature difference
C. Arithmetic mean temperature difference
D. Geometric mean temperature difference

Terminal point temperature differences between fluids in case of a heat exchanger is termed as__________________? Read More »

Chemical Heat Transfer

A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when_________________?

Chemical Heat Transfer / admin

A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when_________________?

A. CPA > CPB
B. CPA < CPB
C. kA < 0.5 kB
D. kA >2 kB

Chemical Heat Transfer