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.Management Sciences
A. The emissivity of a surface decreases, if it gets corroded by atmospheric environment
B. The emissivity of a surface increases with increase in surface roughness
C. The emissivity of a polished surface is quite low
D. The emissivity of a non-metallic surface decreases with increase in the temperature
Related Mcqs:
- Pick out the wrong statement ?
- A. Heat transfer from a hot body to cold body by the emission of heat waves is called radiation B. Filmwise condensation takes place on non-wettable surfaces C. The boiling point of a solution is affected by liquid head as well as boiling point elevation D. None of these...
- The ratio of velocity head to tube side return loss in case of a multipass shell and tube heat exchanger is ________________?
- A. 2 B. 1/2 C. 4 D. 1/4...
- Planck’s distribution law is valid for _____________ bodies?
- A. Black B. White C. Coloured D. All A., B. & C....
- The purpose of providing a ‘catchall’ in the vapor line of an evaporator is to__________________?
- A. Create vacuum B. Regulate the vapor flow C. Vent the non-condensable gases D. Arrest the entrained liquid...
- _____________ paint has the minimum absorption co-efficient?
- A. Black B. White lead C. Grey D. Light cream...
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