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Home⇒ Engineering⇒
Heat transfer
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ The advantage of backward feed multiple effect evaporators over forward feed units is that most concentrated liquid is at highest temperature. [other wrong options] [Discuss in forum] heat sensitive material can be handled. there is no additional cost of pumping. equal heat transfer co-efficients exist in various effects. |
Q22 ⇒ Removal of __________ heat is involved in the condensation of a vapor under saturated conditions. sensible [other wrong options] [Discuss in forum] super latent both(b) & (c) |
Q23 ⇒ In evaporators, lowering the feed temperature both (a) and (b). [other wrong options] [Discuss in forum] increases the heating area required. reduces the economy. decreases the heating area required. |
Q24 ⇒ Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the none of these. [other wrong options] [Discuss in forum] existence of thermal boundary layer. temperature gradient produced due to density difference buoyancy of the bubbles produced at active nucleation site. |
Q25 ⇒ In a shell and tube heat exchanger, putting a longitudinal baffle across the shell, forces the shell side fluid to pass __________ through the heat exchanger. twice [other wrong options] [Discuss in forum] once thrice four times |
Q26 ⇒ Nucleate boiling is promoted on rough surfaces [other wrong options] [Discuss in forum] on polished surfaces in the absence of agitation none of these |
Q27 ⇒ Condensing film co-efficient for steam on horizontal tubes ranges from 5000 to 15000 Kcal/hr.m2 .°C. Condensation of vapor is carried out inside the tube in a shell and tube heat exchanger, when the condensate is corrosive in nature. [other wrong options] [Discuss in forum] higher condensing film co-efficient is desired. lower pressure drop through the exchanger is desired. temperature of the incoming vapor is very high. |
Q28 ⇒ Dropwise condensation of steam on cooling surface is promoted an oily surface. [other wrong options] [Discuss in forum] when both the steam and the tube are clean. only in presence of air. none of these. |
Q29 ⇒ Fruit juice (a heat sensitive material) can be concentrated in a __________ evaporator. falling film [other wrong options] [Discuss in forum] long tube high pressure none of these |
Q30 ⇒ Wavelength corresponding to the maximum energy is inversely proportional to the absolute temperature. This is __________ law. Wien's [other wrong options] [Discuss in forum] Stefan's Dalton's Kirchoffs |
Q31 ⇒ Open pan evaporators are preferred to be used, when the solution to be concentrated is highly viscous [other wrong options] [Discuss in forum] scaling corrosive salty |
Q32 ⇒ Which of the following has maximum thermal conductivity ? Iron [other wrong options] [Discuss in forum] Coal Nitrogen Tar |
Q33 ⇒ Heat waves both (b) and (c). [other wrong options] [Discuss in forum] can not pass through vacuum. travel in straight line. can be reflected by a mirror. |
Q34 ⇒ The Stefan-Boltzman constant depends on the none of these [other wrong options] [Discuss in forum] medium temperature surface |
Q35 ⇒ Fourier's law applies to the heat transfer by conduction [other wrong options] [Discuss in forum] convection radiation all (a), (b) & (c) |
Q36 ⇒ In the equation Q = UAΔt; Δt is logarithmic mean temperature difference. [other wrong options] [Discuss in forum] geometric mean temperature difference. arithmetic mean temperature difference. the difference of average bulk temperatures of hot and cold fluids. |
Q37 ⇒ A __________ evaporator employs an annular downtake. basket type [other wrong options] [Discuss in forum] horizontal long tube vertical none of these |
Q38 ⇒ For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area passes through a maxima [other wrong options] [Discuss in forum] increases decreases remains constant |
Q39 ⇒ Hot water (0.01 m3 /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m3/min) of density 800 kg/m3 and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately 32 [other wrong options] [Discuss in forum] 37 45 50 |
Q40 ⇒ To reduce the tube side pressure drop for the same flow rate, the heat exchanger recomended is 1-1 heat exchanger [other wrong options] [Discuss in forum] 1-2 heat exchanger 3-2 heat exchanger 2-4 heat exchanger |
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