Convective heat transfer, in which heat is transferred by movement of warmed matter is described by___________________?

Byadmin March 3, 2019August 24, 2021

Convective heat transfer, in which heat is transferred by movement of warmed matter is described by___________________?

A. Fourier’s law
B. Newton’s law of cooling
C. Fick’s law
D. None of these

Chemical Heat Transfer

Multiple effect evaporators ar used to___________________?

Multiple effect evaporators ar used to___________________?

A. Increase the steam economy & decrease the capacity
B. Increase the steam economy & the capacity
C. Decrease the steam economy & the capacity
D. Decrease the steam economy & increase the capacity

Read More Multiple effect evaporators ar used to___________________?
Chemical Heat Transfer

For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus- Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of________________?

For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus- Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of________________?

A. 1
B. 1.74
C. 6.1
D. 37

Read More For turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus- Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of________________?
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__________________?
Chemical Heat Transfer

The equation, Nst = (f/2)/[1 + 5 (Npr – 1) √(f/2)], corresponds to ______________ analogy?

The equation, Nst = (f/2)/[1 + 5 (Npr – 1) √(f/2)], corresponds to ______________ analogy?

A. Von-Karman
B. Reynolds
C. Colburn
D. Prandtl

Read More The equation, Nst = (f/2)/[1 + 5 (Npr – 1) √(f/2)], corresponds to ______________ analogy?
Chemical Heat Transfer

Which of the following has the highest thermal conductivity ?

Which of the following has the highest thermal conductivity ?

A. Brick
B. Air
C. Water
D. Silver

Read More Which of the following has the highest thermal conductivity ?
Chemical Heat Transfer

In an extended surface heat exchanger, fluid having lower co-efficient________________?

In an extended surface heat exchanger, fluid having lower co-efficient________________?

A. Flows through the tube
B. Flows outside the tubes
C. Can flow either inside or outside the tubes
D. Should not be used as it gives very high pressure drop

Read More In an extended surface heat exchanger, fluid having lower co-efficient________________?

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