A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness ______________ metre?

Related Mcqs:

In “Imperial Smelting Process” for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following _______________________?

A. Jet of water at high pressure B. Blast of air C. Mixture of water and air D. Rain of molten lead...

Breakeven point represents the condition, when the company runs under no profit no loss condition. In break even analysis, total cost comprises of fixed cost________________?

A. Only B. Plus variable cost C. Plus overhead cost D. Plus selling expenses...

The surface tension of a liquid, at critical temperature is____________________?

A. Indeterminate B. Zero C. Infinity D. Same as that at any other temperature...

Ferromagnetic materials owe their properties to __________________ inner sub-shells ?

A. Completely filled B. Partially filled C. Equally filled D. Vacant...

Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as_________________?

A. Gr0.25, Gr B. Gr0.25, Gr0.33 C. Gr, Gr0.25 D. Gr0.33, Gr0.25...