A. 15 min
B. 22 min
C. 44 min
D. 51 min
Correct Answer: 51 min ✔
Last Updated: March 03, 2019
Related MCQs
- Heat waves__________?
- If air (a non-condensing gas) is present in a condensing vapor stream, it will __________ the condensation rate of vapor?
- For a perfectly transparent surface (like gases), the__________?
- A fluid is flowing inside the inner tube of a double pipe heat exchanger with diameter ‘d’. For a fixed mass flow rate, the tube side heat transfer co-efficient for turbulent flow conditions is proportional to__________?
- Heat transfer co-efficient (h) for a fluid flowing inside a clean pipe is given by h = 0.023 (K/D) (DVρ/μ)0.8 (CP.μ/k)0.4. This is valid for the value of NRe equal to__________?
- The ratio of kinematic viscosity to thermal diffusivity is called the __________ number?
- Vibrations in the tubes of a shell and tube heat exchanger is induced due to the __________?
- What is the steam economy in case of a single effect evaporator system ?
- For 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__________?
- Baffles in the shell side of a shell and tube heat exchanger ?
- __________ chart is known as transient heat conduction chart?
- Controlling heat transfer film co-efficient is the one, which offers __________ resistance to heat transfer?
- Which of the following is concerned with both heat and mass transfer ?
- Duhring‟s rule is important in solving problems on__________?
- Heat transfer by radiation between two bodies at T1 & T2 and in an ambient temperature of Ta°C depends on__________?
- The film thickness for laminar film condensation on vertical surface __________ from top to bottom?
- __________ paint has the minimum absorption co-efficient?
- For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area__________?
- Mode of heat transfer in which the fluid moves under the influence of changes in fluid pressure produced by external work is called__________?
- Steam traps are provided in steam carrying pipelines to__________?
- Kirchoff‟s law applies to __________ radiation?
- Log mean temperature difference (LMTD) cannot be used, if __________?
- 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__________?
- Bulk of the convective heat transfer resistance from a hot tube surface to the fluid flowing in it, is __________?
- If Prandtl number is greater than the Schmidt number, then the__________?
- Thermal diffusivity is the most important in heat transfer by__________?
- LMTD correction factor which is to be applied for a cross-flow heat exchanger increases with increase in the number of shell passes. Its value for a single pass cross flow heat exchanger is __________?
- The statement that “maximum wavelength of radiation is inversely proportional to the temperature” is __________ law?
- Among liquids, water has a comparatively high value of thermal conductivity, due to its__________?
- In which mode of heat transfer, the Biot number is important ?
- A diathermanous substance __________ the thermal radiation completely?
- Boiling point elevation of a solution of NaOH __________?
- Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.) ?
- Overall thermal resistance for conductive heat transfer through a series of flat resistances is equal to the__________?
- Prandtl and Reynolds analogy are same, when Prandtl number is__________?
- Arithmetic mean area can be used in heat transfer problem to calculate the heat flow by conduction through a cylinder which is __________?
- jH factor for heat transfer is not a function of the __________ number?
- In a heat exchanger, one transfer unit means__________?
- A 2-4 heat exchanger involves__________?
- In a shell and tube heat exchanger, the height of 25 percent cut baffles is equal to (where, D = inside diameter of shell) ?
- Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around __________ BTU?
- Baffle spacing __________?
- The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness) __________?
- The purpose of floating head in a heat exchanger is to__________?
- Mechanical recompression evaporation is used in the production of__________?
- The outlet temperature of cooling water in a heat exchanger is generally not allowed to exceed above 50°C in industrial practice mainly to avoid__________?
- The Fourier number (defined as a.t/L2) is used in the analysis of problem involving heat transfer by__________?
- Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for__________?
- Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids ?
- For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then__________?
- Heat transfer in the laminar sub-layer in case of a liquid flowing through a pipe, is mostly by__________?