An idling engine runs at an engine speed of 600 rpm. The mass air flow meter measures an air flow of 3.6 g/s. How many grams are drawn in by the engine per revolution?

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?

Machinery that is a key part of the process and without which the plant or process cannot function is classifed as: (clo4) a)-critical machinery b)-essential machinery c)-general purpose machinery d)-none of the specified options.

What is the heat treatment of metals? what is the benefit of it? why and how it's useful? answer in details, do not write by hand.