For infinite parallel planes having emissivities ε1 & ε2, the interchange factor for radiation from surface 1 to surface 2 is given by__________________?

Related Mcqs:

Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than ?

A. 5 B. 10 C. 20 D. 35...

‘Cryogenics’ is concerned with the generation & use of low temperature in the range of____________________?

A. 0°K to 123°K B. 0°C to – 123°C C. 0°C to – 273°C D. 0°K to 273°K...

Unit of surface tension in S.I. unit is_________________?

A. Watt/m B. Joule/m2 C. Newton/m2 D. Joule/m...

Increasing sulphur content in pig iron tends to make it ________________?

A. Soft B. Hard C. Tough D. Ductile & malleable...

A spring material should have low__________________?

A. Elastic limit B. Deflection value C. Fatigue resistance D. None of these...