Which of the following has the lowest overall heat transfer co-efficient ?

Related Mcqs:

Fouling factor for a heat exchanger is given by (where, U1 = heat transfer co-efficient of dirty surface U2 = heat transfer co-efficient of clean surface) ?

A. U1 – U2 B. 1/U1 – 1/U2 C. 1/U2 – 1/U1 D. U2 – U1...

Maximum heat transfer rate is obtained in ______________ flow?

A. Laminar B. Turbulent C. Creeping D. Transition region...

A sphere of radius ‘R1’ is enclosed in a sphere of radius ‘R2’. The view (or shape) factor for radiative heat transfer of the outer sphere with respect to the inner sphere is ________________?

A. 0 B. R2/(R1+R2) C. 1 D. (R1/R2)2...

In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used________________?

A. In low range of temperature differences B. In high range of temperature differences C. Because of its low cost D. To prevent corrosion of the tube bundles...

For heat flow through very thick walled cylinder, use ___________mean radius?

A. Arithmetic B. Logarithmic C. Geometric D. Either A. or C....