Solid angle subtended by the finite surface at the radiating element is

Related MCQs

• 200 kg of solids (on dry basis) is subjected to a drying process for a period of 5000 seconds. The drying occurs in the constant rate period with the drying rate as, Nc = 0.5 × 10-3 kg/m2 .s. The initial moisture content of the solid is 0.2 kg moisture/kg dry solid. The interfacial area available for drying is 4 m2 /1000 kg of dry solid. The moisture content at the end of the drying period is (in kg moisture/kg dry solid).
• The rate of energy emission from unit surface area through unit solid angle, along a normal to the surface, is known as
• Depending on the radiating properties, a body will be white when (where a = absorptivity, p = reflectivity, x = transmissivity)
• Depending on the radiating properties, a body will be black when (where a = absorptivity, p == reflectivity, X = transmissivity.)
• Depending on the radiating properties, a body will be opaque when (where a = absorptivity, p = reflectivity, X = transmissivity.)
• Depending on the radiating properties, body will be transparent when
• The ratio of total radiating power to the absorptivity of the body depends upon the __________ as per Kirchoff‟s law.
• As per Kirchoff‟s law, the ratio of the total radiating power to the absorptivity of a body depends on the
• All substances emit radiation, the quality and quantity depending upon the absolute temperature and the properties of the material composing the radiating body. The above statement is known as the statement of
• The coefficient of linear expansion of a solid is L. The volume V of a cube of this solid on being heated by 1?C will change by