A cylindrical tank measuring 0.75 m in diameter and 1.2 m high contains a transformer immersed in an oil bath that produces a uniform surface temperature condition. All heat loss may be assumed due to natural convection to surrounding air at 295 K from the top and side walls. The heat dissipation rate from the transformer is constant at 1.5kW. Required:
Write down the total heat transfer rate equation as a function of surface temperature and relevant characteristic dimensionless numbers.

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?

The higher the astm grain size number, the finer the gran is. a)-true b)-false