The Stefan-Boltzmann constant depends on the_________________?
The Stefan-Boltzmann constant depends on the_________________?
A. Medium
B. Temperature
C. Surface
D. None of these
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In Fourier’s law, the proportionality constant is called the______________________?
In Fourier’s law, the proportionality constant is called the______________________?A. Heat transfer co-efficient
B. Thermal diffusivity
C. Thermal conductivity
D. Stefan-Boltzmann constant“The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium”. This is ______________ law?
“The ratio of the total emissive power to the absorptivity for all bodies is same at ther-mal equilibrium”. This is ______________ law?A. Kirchoff’s
B. Planck’s
C. Wien’s displacement
D. Stefan-BoltzmannThe sum of reflectivity and absorptivity for an opaque body is equal to____________________?
The sum of reflectivity and absorptivity for an opaque body is equal to____________________?A. 0.5
B. 1
C. 0
D. 2Which of the following is directly concerned with the heat transfer ?
Which of the following is directly concerned with the heat transfer ?A. Strouhal number
B. Sherwood number
C. Euler number
D. Grashoff numberWhat is the unit of thermal conductivity ?
What is the unit of thermal conductivity ?A. Kcal/hr. m2 °C
B. Kcal/hr.m.°C
C. Kcal/hr.m
D. Kcal/hr. °CVibrations in the tubes of a shell and tube heat exchanger is induced due to the _________________?
Vibrations in the tubes of a shell and tube heat exchanger is induced due to the _________________?A. Flow of fluid on the tube and shell sides
B. Oscillations in the flow of shell/tube sides fluid
C. Vibrations transmitted through pig and/or supports due to external reasons
D. All A., B. and C.