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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. |
| Q1 ⇒ A hot liquid is kept in a big room. The logorithm of the numerical value of the temperature difference between the liquid and the room is plotted against time. The plot will be very nearly a/an straight line [other wrong options] [Discuss in forum] |
| Q2 ⇒ In a parallel flow heat exchanger, if the outlet temperature of hot and cold fluids are the same, then the log mean temperature difference (LMTD) is zero [other wrong options] [Discuss in forum] |
| Q3 ⇒ Which of the following accessories is provided in the vapor line of an evaporator for removing the entrained liquid ? Catchall [other wrong options] [Discuss in forum] |
| Q4 ⇒ Pick out the wrong statement. Swenson-Walker crystalliser is a batch crystalliser. [other wrong options] [Discuss in forum] |
| Q5 ⇒ Nusselt number (for forced convection heat transfer) is a function of the __________ number. both (a) & (b) [other wrong options] [Discuss in forum] |
| Q6 ⇒ In thermal radiation for a black body (where, ε is emissivity and α is absorptivity) α = 1; ε = 1 [other wrong options] [Discuss in forum] |
| Q7 ⇒ At what value of Prandtl number, the hydrodynamic and thermal boundary layers are identical ? 1 [other wrong options] [Discuss in forum] |
| Q8 ⇒ Nusselt number for full developed, laminar, constant property flow in a pipe at uniform heat flux is 4.364 [other wrong options] [Discuss in forum] |
| Q9 ⇒ Pick out the wrong statement. Film boiling is desirable in commercial equipments due to high heat transfer rate at low temperature drop. [other wrong options] [Discuss in forum] |
| Q10 ⇒ 1 BTU/hr.ft.°F is equal to __________ kcal/hr. m.°C. 1.49 [other wrong options] [Discuss in forum] |
| Q11 ⇒ An evaporator while concentrating an aqueous solution from 10 to 40% solids evaporates 30000 kg of water. The amount of solids handled by the system in kg is 4000 [other wrong options] [Discuss in forum] |
| Q12 ⇒ The rate of emission of radiation by a body does not depend upon the shape and porosity of the body. [other wrong options] [Discuss in forum] |
| Q13 ⇒ Overall heat transfer co-efficient of a particular tube is U1. If the same tube with some dirt deposited on either side has coefficient U2, then U1 = U2 [other wrong options] [Discuss in forum] |
| Q14 ⇒ Which of the following has the lowest Prandtl number ? Molten sodium (a coolant used in fast breeder reactor) [other wrong options] [Discuss in forum] |
| Q15 ⇒ The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the solution has an elevation of boiling point. [other wrong options] [Discuss in forum] |
| Q16 ⇒ For a multipass shell and tube heat exchanger, the LMTD correction factor is always < 1 [other wrong options] [Discuss in forum] |
| Q17 ⇒ Agitated film evaporator is suitable for concentrating __________ liquids. viscous [other wrong options] [Discuss in forum] |
| Q18 ⇒ Fourier's law of heat conduction applies to __________ surfaces. both (a) and (b) [other wrong options] [Discuss in forum] |
| Q19 ⇒ The statement that "maximum wavelength of radiation is inversly proportional to the temperature" is __________ law. Wien's displacement [other wrong options] [Discuss in forum] |
| Q20 ⇒ __________ paint has the minimum absorption co-efficient. White lead [other wrong options] [Discuss in forum] |
| Or |