With increase in porosity, the thermal conductivity of a solid substance__________________?

Related Mcqs:

Critical value of the _____________ number governs the transition from laminar to turbulent flow in free convection heat transfer?

A. Grashoff B. Reynolds C. Both ‘a’ & ‘b’ D. Prandtl & Grashoff...

Minimum recommended baffle spacing in a shell and tube heat exchanger is about (where, D = shell diameter)?

A. 0.2 D B. 0.5 D C. 0.66 D D. 0.80 D...

A _____________ evaporator employs an annular downtake?

A. Basket type B. Horizontal C. Long tube vertical D. None of these...

For hot feed, forward feeding as compared to backward feeding results in ______________ economy?

A. Increased B. Decreased C. No effect on D. None of these...

Tube pitch is the _______________ of tube diameters and the clearances?

A. Sum B. Difference C. Ratio D. None of these...