Chemical Heat Transfer

Baffles are provided in heat exchangers to increase the________________?

Byadmin March 3, 2019August 24, 2021

Baffles are provided in heat exchangers to increase the________________?

A. Fouling factor
B. Heat transfer area
C. Heat transfer co-efficient
D. Heat transfer rate

Chemical Heat Transfer

Overall heat transfer co-efficient for cooling of hydrocarbons by water is about_________________?

Overall heat transfer co-efficient for cooling of hydrocarbons by water is about_________________?

A. 50 -100 Kcal/hr.m2.°C
B. 50 -100 W/m2.°K
C. 50 -100 BTU/hr. ft.2°F
D. 1000 – 1500 BTU/hr. ft.2°F

Read More Overall heat transfer co-efficient for cooling of hydrocarbons by water is about_________________?
Chemical Heat Transfer

Steam side heat transfer co-efficient in an evaporator is in the range of ______________ kcal/hr.m2°C?

Steam side heat transfer co-efficient in an evaporator is in the range of ______________ kcal/hr.m2°C?

A. 10-50
B. 100-500
C. 1000-1500
D. 5000-15000

Read More Steam side heat transfer co-efficient in an evaporator is in the range of ______________ kcal/hr.m2°C?
Chemical Heat Transfer

Maximum heat transfer rate is achieved in _____________ flow?

Maximum heat transfer rate is achieved in _____________ flow?

A. Co-current
B. Counter-current
C. Turbulent
D. Laminar

Read More Maximum heat transfer rate is achieved in _____________ flow?
Chemical Heat Transfer

With increase in temperature, the thermal conductivity of a gas ___________________?

With increase in temperature, the thermal conductivity of a gas ___________________?

A. Increases
B. Decreases
C. Remain same
D. May increase or decrease depending on the type of gas

Read More With increase in temperature, the thermal conductivity of a gas ___________________?
Chemical Heat Transfer

As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient ?

As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient ?

A. Continues to increase
B. Continues to decrease
C. Goes through a minimum
D. Goes through a maximum

Read More As the difference between the wall temperature and bulk temperature increases, the boiling heat transfer co-efficient ?
Chemical Heat Transfer

The energy radiated from a surface Q at absolute temperature T is related as__________________?

The energy radiated from a surface Q at absolute temperature T is related as__________________?

A. Q ∝ T2
B. Q ∝ T4
C. Q ∝ T3
D. None of these

Read More The energy radiated from a surface Q at absolute temperature T is related as__________________?

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