Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called_______________?

Byadmin March 3, 2019August 24, 2021

Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called_______________?

A. Radiation
B. Natural convection
C. Forced convection
D. Conduction

Chemical Heat Transfer

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

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

A. Dowtherm
B. Molten sodium
C. Water
D. Air

Read More Which of the following has the lowest overall heat transfer co-efficient ?
Chemical Heat Transfer

1000 kg of wet solids are to be dried from 60% to 20% moisture (by weight). The mass of moisture removed in kg is__________________?

1000 kg of wet solids are to be dried from 60% to 20% moisture (by weight). The mass of moisture removed in kg is__________________?

A. 520
B. 200
C. 400
D. 500

Read More 1000 kg of wet solids are to be dried from 60% to 20% moisture (by weight). The mass of moisture removed in kg is__________________?
Chemical Heat Transfer

Three materials A, B and C of equal thickness and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface between B and C will be at a temperature of ____________ °C?

Three materials A, B and C of equal thickness and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface between B and C will be at a temperature of ____________ °C?

A. 40
B. 95
C. 70
D. 50

Read More Three materials A, B and C of equal thickness and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface between B and C will be at a temperature of ____________ °C?
Chemical Heat Transfer

What is the thermal conductivity of a perfect heat insulator ?

What is the thermal conductivity of a perfect heat insulator ?

A. Zero
B. One
C. ∞
D. Between 0 and ∞

Read More What is the thermal conductivity of a perfect heat insulator ?
Chemical Heat Transfer

If heat transfer rate varies with the time, it is termed as__________________?

If heat transfer rate varies with the time, it is termed as__________________?

A. Forced convection
B. Steady state conduction
C. Monochromatic radiation
D. None of these

Read More If heat transfer rate varies with the time, it is termed as__________________?
Chemical Heat Transfer

Vacuum is generally maintained in the vapour space of an evaporator mainly to__________________?

Vacuum is generally maintained in the vapour space of an evaporator mainly to__________________?

A. Get economical temperature difference by using moderate pressure steam
B. Facilitate forward feeding in multiple effect evaporation
C. Concentrate heat sensitive materials
D. Achieve very high concentration of the final product

Read More Vacuum is generally maintained in the vapour space of an evaporator mainly to__________________?

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