Pool
Nucleate
Transition
Film
✅ The correct answer is option D.
Heat Transfer MCQs
Evaporation of 1kg of water from a solution in a single effect evaporator requires about __________ kg of steam.
0.4 – 0.6
1-1.3
1.8-2
2 – 2.4
✅ The correct answer is option B.
Tube pitch is the __________ of tube diameters and the clearances.
Sum
Difference
Ratio
None of these
✅ The correct answer is option A.
The equivalent diameter for the annulus of a double pipe heat exchanger, whose inner pipe has fins on the outside is __________ compared to the same size pipes without fins.
More
Less
Same
Unpredictable
✅ The correct answer is option B.
In a multiple effect evaporator, the effect of boiling point elevation is to
Reduce the capacity
Reduce the economy
Increase the economy
None of these
✅ The correct answer is option A.
The unit of heat transfer co-efficient is
BTU/hr. ft²°F
BTU/hr. °F. ft
BTU/hr. °F
BTU/hr. ft
✅ The correct answer is option A.
Steam is to be condensed in a shell and tube heat exchanger, 5 m long with a shell diameter of 1 m. Cooling water is to be used for removing the heat. Heat transfer co-efficient for the cooling water, whether on shell side or tube side is the same. The best arrangement is
Vertical heat exchanger with steam on tube side
Vertical heat exchanger with steam on shell side
Horizontal heat exchanger with steam on tube side
Horizontal heat exchanger with steam on shell side
✅ The correct answer is option B.
The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, ΔT = Temperature drop across condensate film )
(ΔT)2
√ΔT
(ΔT)1/4
(ΔT)3/2
✅ The correct answer is option C.
If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is hl then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length
Ha = hl
Ha = 2hl
Ha = 0.5 hl
Ha = 0.75 hl
✅ The correct answer is option B.
Stefan-Boltzman law which describes the radiation heat transfer states that, it is proportional to (where, t = temperature in °C T = absolute temperature in ° K )
t⁴
T⁴
1/t⁴
1/T⁴
✅ The correct answer is option B.