A.? = 0
B.? + ? = 0
C.? = 1
D.? = 0
Related Mcqs:
- Suppose that the transmissivity is zero for a very thick piece of material. If the material is perfectly white where ? = absorptivity and ? = reflectivity
- Suppose that we have an ideal piece of glass with ? = 0. If ? = 0.09 where ? = transmissivity ? = reflectivity and ? = absorptivity
- The absorptivity of the black absorber plate coated with a common flat=black paint is typically
- If the absorptivity plus reflectivity of a body equals 1, then the body is known as
- The rate of heat flow from a 50 mm thick wall of material having thermal conductivity of 40 W/m?C for a temperature difference of 10?C will be
- Suppose it is a winter night and at about 11 p.m., the air cools to the dew-point temperature and a thick radiation fog develops. If the air continues to cool during the night, in 5 hours the dew point temperature will probably __________.
- The rate of radiant energy, which is emitted by a surface at any temperature and in small wavelength is found from the known rate of energy, which under the same condition would be emitted from a black surface by multiplying with the absorptivity. Above enunciation is known as
- The rate of radiant energy, which is emitted by a surface at any temperature and in small wavelengths is found from the known rate of energy, which under the same conditions would be emitted from a black surface, by multiplying with the absorptivity. Above enunciation is known as
- For punching a hole of 25 mm diameter in a plate 20 mm thick, if the shear stress of plate material is 30 kg/mm2, the force required would be
- A steel piece after hardening is heated to 300?C and then cooled in oil. The property imparted to the steel piece will be
