For what value of Prandtl number, the Col-burn analogy is valid ?

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Double pipe heat exchangers are used__________________?

A. When heat transfer area required is very high B. When heat transfer area required is very low, i.e. (100-200 ft2). C. Because it occupies less floor area D. Because it is less costly...

In a multipass shell and tube heat exchanger, tube side return pressure loss is equal to _____________ the velocity head?

A. Twice B. Four times C. Square root of D. Square of...

The sum of reflectivity and absorptivity for an opaque body is equal to____________________?

A. 0.5 B. 1 C. 0 D. 2...

Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around ______________ BTU?

A. 180 B. 970 C. 3.97 D. None of these...

A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides __________________?

A. Higher economy B. Lower capacity C. Both A. & B. D. Lower economy...