The Following Section consists of Multiple Choice Questions on Heat Transfer.
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Heat Transfer MCQ
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Question 1 of 20
1. Question
1 pointsIn Fourier’s law, the proportionality constant is called the
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Question 2 of 20
2. Question
1 pointsThe heat transfer co-efficient in film type condensation is __________ that for dropwise condensation
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Question 3 of 20
3. Question
1 pointsPick out the wrong statement.
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Question 4 of 20
4. Question
1 points‘Duhring’s plot’ is of use in
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Question 5 of 20
5. Question
1 pointsWhich has the lowest Prandtl number ?
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Question 6 of 20
6. Question
1 pointsPick out the wrong statement.
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Question 7 of 20
7. Question
1 pointsPrandtl number for most of dry gases is about
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Question 8 of 20
8. Question
1 pointsPrandtl number is the reciprocal of
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Question 9 of 20
9. Question
1 pointsIn a heat exchanger with steam outside the tubes, a liquid gets heated to 45°C, when its flow velocity in the tubes is 2 m/s. If the flow velocity is reduced to 1 m/s, other things remaining the same, the temperature of the exit liquid will be
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Question 10 of 20
10. Question
1 pointsMultiple effect evaporation accounts for
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Question 11 of 20
11. Question
1 pointsIn case of a supercooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is
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Question 12 of 20
12. Question
1 pointsMaximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around __________ metres/second.
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Question 13 of 20
13. Question
1 pointsIn Biot number, the characteristic length used is the ratio of the __________ of the solid.
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Question 14 of 20
14. Question
1 pointsWhich of the following is the most widely used heat insulating material for pipelines carrying steam ?
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Question 15 of 20
15. Question
1 pointsIn case of a multipass shell and tube heat exchanger, the temperature drop in the fluid
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Question 16 of 20
16. Question
1 pointsThe purpose of providing expansion bellows in the shell of tubular exchanger is to
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Question 17 of 20
17. Question
1 pointsPick out the wrong statement.
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Question 18 of 20
18. Question
1 pointsEvaporation by thermocompression results in the
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Question 19 of 20
19. Question
1 pointsSteam economy in case of a triple effect evaporator will be
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Question 20 of 20
20. Question
1 pointsA __________ evaporator employs an annular downtake.
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Heat Transfer MCQ 2
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Question 1 of 20
1. Question
1 pointsRadiation heat losses from satisfactorily insulated high pressure boilar may be about __________ percent.
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Question 2 of 20
2. Question
1 pointsIn natural convection heat transfer, the correlating parameter is the
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Question 3 of 20
3. Question
1 pointsBoiling of milk in an open vessel is an example of __________ boiling.
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Question 4 of 20
4. Question
1 pointsMode of heat transfer involved in the cooling of air cooled internal combustion engine is
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Question 5 of 20
5. Question
1 pointsSteady state one dimensional heat flow by conduction as given by Fourier’s low does not assume that
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Question 6 of 20
6. Question
1 pointsIn a shell and tube heat exchanger, the shell side fluid velocity can not be changed by changing the
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Question 7 of 20
7. Question
1 pointsTo reduce the tube side pressure drop for the same flow rate, the heat exchanger recomended is
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Question 8 of 20
8. Question
1 pointsCorrection is applied to LMTD for __________ flow.
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Question 9 of 20
9. Question
1 pointsOne kilogram of water at 0°C is changed to superheated steam of one atm pressure and 300° C. The major heat consumption in the process will be to
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Question 10 of 20
10. Question
1 pointsFor __________ Prandtl number values, the heat conduction will be negligible in the buffer zone.
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Question 11 of 20
11. Question
1 pointsHeat exchangers operating, when the asymptotic range is reached,
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Question 12 of 20
12. Question
1 pointsIn case of a shell and tube heat exchanger, the minimum and maximum baffle spacing is respectively (where, D = inside diameter of the shell)
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Question 13 of 20
13. Question
1 pointsIn case of heat transfer by conduction in a hollow cylinder, __________ mean area is used to calculate the heat transfer rate.
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Question 14 of 20
14. Question
1 pointsIn a gas-liquid shell and tube heat exchanger, the
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Question 15 of 20
15. Question
1 pointsWhich is the most suitable for the concentration of foamy & frothy liquors ?
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Question 16 of 20
16. Question
1 pointsBoiling point elevation of an ideal solution
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Question 17 of 20
17. Question
1 pointsThe rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the
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Question 18 of 20
18. Question
1 pointsWhich of the following has the lowest overall heat transfer co-efficient ?
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Question 19 of 20
19. Question
1 pointsWhich of the following has the minimum absorptivity ?
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Question 20 of 20
20. Question
1 pointsA black body when hot, emits heat radiation of __________ wavelengths.
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Heat Transfer MCQ 3
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Question 1 of 20
1. Question
1 pointsHeat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is
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Question 2 of 20
2. Question
1 pointsThe Nusselt number for fully developed (both thermally and hydrodynamically) laminar flow through a circular pipe whose surface temperature remains constant is
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Question 3 of 20
3. Question
1 pointsSensible heat of hot industrial flue gases can not be recovered by a/an
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Question 4 of 20
4. Question
1 pointsRadiator of an automobile engine is a __________ type of heat exchanger.
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Question 5 of 20
5. Question
1 pointsIn pipe flow, heat is transferred from hot wall to the liquid by
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Question 6 of 20
6. Question
1 pointsFor turbulent flow in a tube, the heat transfer co-efficient is obtained from the Dittus-Boelter correlation. If the tube diameter is halved and the flow rate is doubled, then the heat transfer co-efficient will change by a factor of
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Question 7 of 20
7. Question
1 pointsValue of Nusselt number [Nu = (hD/k)] for the heat transfer by conduction from a droplet or a spherical particle to a surrounding stagnant film is
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Question 8 of 20
8. Question
1 pointsLow thermal conductivity of heat insulating materials is due to its
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Question 9 of 20
9. Question
1 pointsThe most conducive surface for dropwise condensation to occur is the __________ surface.
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Question 10 of 20
10. Question
1 pointsIn an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of
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Question 11 of 20
11. Question
1 pointsCalburn analogy is applicable for the value of Prandtl number from
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Question 12 of 20
12. Question
1 pointsMultiple effect evaporators ar used to
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Question 13 of 20
13. Question
1 pointsSmall scale evaporation is done in a
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Question 14 of 20
14. Question
1 pointsHeat exchanger tubes are never made of
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Question 15 of 20
15. Question
1 pointsAt constant temperature, the thermal conductivities of gases __________ with rise in pressure.
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Question 16 of 20
16. Question
1 pointsIn a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid
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Question 17 of 20
17. Question
1 pointsWith increase in temperature, the total emissivity of conductors
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Question 18 of 20
18. Question
1 pointsLoss of heat from untagged steam pipe to the ambient air is by
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Question 19 of 20
19. Question
1 pointsFruit juice (a heat sensitive material) can be concentrated in a __________ evaporator.
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Question 20 of 20
20. Question
1 pointsTubes are held between top and bottom tube sheets in Calenderia type evaporator by keeping
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Heat Transfer MCQ 4
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Question 1 of 20
1. Question
1 pointsHeat sensitive materials can be concentrated in an evaporator employing
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Question 2 of 20
2. Question
1 pointsA concentric double pipe heat exchanger as compared to the shell and tube heat exchanger for the same heat load requires
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Question 3 of 20
3. Question
1 pointsIn a shell and tube heat exchanger, floating head is used for
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Question 4 of 20
4. Question
1 pointsSteam trap is used to
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Question 5 of 20
5. Question
1 pointsMaximum heat transfer rate is achieved in __________ flow.
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Question 6 of 20
6. Question
1 pointsWavelength corresponding to the maximum energy is inversely proportional to the absolute temperature. This is __________ law.
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Question 7 of 20
7. Question
1 pointsThree material A, B and C of equal thick-nes and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface between B and C will be at a temperature of __________ °C.
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Question 8 of 20
8. Question
1 pointsWhich of the following parameters of the fluid is not very important, while deciding its route in a shell and tube heat exchanger?
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Question 9 of 20
9. Question
1 pointsThe driving potential for the crystal growth during crystallisation is the __________ of the solution.
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Question 10 of 20
10. Question
1 pointsjH factor for heat transfer depends upon the __________ number.
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Question 11 of 20
11. Question
1 pointsKg of liquid evaporated per hour in an evaporator is defined as its
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Question 12 of 20
12. Question
1 pointsPick out the correct statement.
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Question 13 of 20
13. Question
1 pointsOpen pan evaporators are preferred to be used, when the solution to be concentrated is
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Question 14 of 20
14. Question
1 pointsThe maximum heat transfer co-efficient from steam heating will be attained when the steam is
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Question 15 of 20
15. Question
1 pointsIn a forward feed multiple effect evaporator, the pressure is
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Question 16 of 20
16. Question
1 pointsIn a co-current double pipe heat exchanger used for condensing saturated steam over the inner tube, if the entrance and exit conditions of the coolant are interchanged, then the rate of condensation will
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Question 17 of 20
17. Question
1 pointsSensible heat absorbed by 1 lb of water when it is heated from 32 to 212°F may be around __________ BTU.
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Question 18 of 20
18. Question
1 pointsIn a shell and tube heat exchanger, square pitch compared to triangular pitch
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Question 19 of 20
19. Question
1 pointsWhich of the following has maximum thermal conductivity ?
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Question 20 of 20
20. Question
1 pointsA wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of materialA is twice that of B. Under the equilibrium, the temperature difference across the wall is 36°C. The temperature difference across the layer A is __________ °C.
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