Air is best heated with steam in a heat exchanger of__________________?

Byadmin March 3, 2019August 24, 2021

Air is best heated with steam in a heat exchanger of__________________?

A. Plate type
B. Double pipe type with fin on steam side
C. Double pipe type with fin on air side
D. Shell and tube type

Chemical Heat Transfer

The critical radius ‘r’ of insulation on a pipe is given by____________________?

The critical radius ‘r’ of insulation on a pipe is given by____________________?

A. r = 2k/h
B. r = k/h
C. r = k/2h
D. r = h/k

Read More The critical radius ‘r’ of insulation on a pipe is given by____________________?
Chemical Heat Transfer

In an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of___________________?

In an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of___________________?

A. Concentrations
B. Chemical potentials
C. Activity co-efficients
D. Mass transfer co-efficients

Read More In an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of___________________?
Chemical Heat Transfer

Finned tube heat exchangers__________________?

Finned tube heat exchangers__________________?

A. Give larger area per tube
B. Use metal fins of low thermal conductivity
C. Facilitate very large temperature drop through tube wall
D. Are used for smaller heat load

Read More Finned tube heat exchangers__________________?
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________________?
Chemical Heat Transfer

In case of evaporators, liquid entrainment results primarily due to_________________?

In case of evaporators, liquid entrainment results primarily due to_________________?

A. High vacuum in the evaporator
B. High evaporation rate
C. Foaming of the solution
D. High heat transfer rate

Read More In case of evaporators, liquid entrainment results primarily due to_________________?
Chemical Heat Transfer

The equation, (NSt × N2/3 Pr) = f/2, is the ____________ analogy ?

The equation, (NSt × N2/3 Pr) = f/2, is the ____________ analogy ?

A. Colburn
B. Reynolds
C. Prandtl
D. None of these

Read More The equation, (NSt × N2/3 Pr) = f/2, is the ____________ analogy ?

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