What is the thermal conductivity of a perfect heat insulator ?

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Tube expansion allowances exist in _____________ heat exchanger?

A. Multipass fixed tube sheet B. U-tube C. Single pass fixed tube sheet D. None of these...

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...

The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = K0 + at, where, K is the thermal conductivity and T is the temperature (in °K). The units of ‘a’ in SI system will be________________?

A. W/m.k B. W/m C. W/m.k2 D. None, ‘a’ is just a number...

In a single effect evaporator, the economy is________________?

A. 1 B. < 1 C. > 1 D. None of these...