Chemical Heat Transfer

A body is called grey if the monochromatic emissivity of the body is___________________?

Byadmin March 3, 2019August 24, 2021

A body is called grey if the monochromatic emissivity of the body is___________________?

A. Zero
B. Unity
C. Same for all wavelengths
D. Different for all wavelengths

Chemical Heat Transfer

If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows _____________ law?

If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows _____________ law?

A. Parabolic
B. Hyperbolic
C. Linear
D. Logarithmic

Read More If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows _____________ law?
Chemical Heat Transfer

When the ratio of the Grashoff number and to the square of Reynolds number is one, the dominant mechanism of heat transfer is _______________?

When the ratio of the Grashoff number and to the square of Reynolds number is one, the dominant mechanism of heat transfer is _______________?

A. Free convection
B. Entry length problem in laminar forced conduction (develog thermal boundary layer)
C. Mixed convection (both free and forced)
D. Forced convection

Read More When the ratio of the Grashoff number and to the square of Reynolds number is one, the dominant mechanism of heat transfer is _______________?
Chemical Heat Transfer

In natural convection heat transfer, the correlating parameter is the_______________________?

In natural convection heat transfer, the correlating parameter is the_______________________?

A. Graetz number
B. Eckert number
C. Grashoff number
D. Bond number

Read More In natural convection heat transfer, the correlating parameter is the_______________________?
Chemical Heat Transfer

A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m2.K. The Biot number is ______________?

A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m2.K. The Biot number is ______________?

A. 5.6
B. 0.025
C. 3.5
D. 0.0035

Read More A metal wire of 0.01 m dia and thermal conductivity 200 W/m.K is exposed to a fluid stream with a convective heat transfer coefficient of 100 W/m2.K. The Biot number is ______________?
Chemical Heat Transfer

LMTD can’t be used as such without a correction factor for the_________________?

LMTD can’t be used as such without a correction factor for the_________________?

A. Multipass heat exchanger
B. Baffled heat exchanger
C. Condensation of mixed vapour in a condenser
D. All A. B. and C.

Read More LMTD can’t be used as such without a correction factor for the_________________?
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___________________?

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