Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity ?

Related Mcqs:

Steam economy in case of a triple effect evaporator will be _________________?

A. 1 B. < 1 C. > 1 D. Between 0 and 1...

In SI units, fouling factor is expressed in __________________?

A. m2°K/W B. W/m2°K C. m2°K D. m°K/W...

In a 1-1 concurrent heat exchanger, if the tube side fluid outlet temperature is equal to the shell side fluid outlet temperature, then the LMTD is_________________?

A. ∞ B. 0 C. Equal to the difference between hot and cold fluids inlet temperature D. Equal to the difference between hot fluid inlet temperature and cold fluid outlet temperature...

In counter flow compared to parallel flow, ?

A. LMTD is greater B. Less surface area is required for a given heat transfer rate C. Both A. and B. D. More surface area is required for a given heat transfer rate...

Analogy between mass and heat transfer is not applicable in case of____________________?

A. Same velocity profile or equal eddy diffusivities B. Thermal or pressure mass diffusion C. Viscous heating or chemical reaction D. Both B. and C....