1000+ Heat Transfer Questions and Answers Pdf - 1
Question: 1
Maximum heat transfer rate is achieved in _____ flow.
(A) laminar
(B) turbulent
(C) counter-current
(D) co-current
Ans: B
turbulent
Question: 2
Heat exchanger tubes are never made of
(A) copper
(B) lead
(C) stainless steel
(D) plain carbon steel
Ans: B
lead
Question: 3
The ratio of thermal boundary layer thickness to the concentration boundary layer. Thickness is proportional to
(A) Pr
(B) Sh
(C) Nu
(D) Le
Ans: D
Le
Question: 4
Out of the following, the best conductor of heat is
(A) sodium
(B) lead
(C) mercury
(D) zinc
Ans: A
sodium
Question: 5
In pipe flow, heat is transferred from hot wall to the liquid by
(A) free and forced convection
(B) forced convection and conduction
(C) forced convection only
(D) conduction only
Ans: B
forced convection and conduction
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