A. 1
B. 1.74
C. 6.1
D. 37
Correct Answer: 1 ✔
Last Updated: March 03, 2019
Related MCQs
- 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__________?
- __________ heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side?
- Evaporation of 1kg of water from a solution in a single effect evaporator requires about __________ kg of steam?
- Thermal conductivities of most of the liquids __________ with rise in temperature?
- The purpose of providing a ‘catchall’ in the vapor line of an evaporator is to__________?
- Removal of __________ heat is involved in the condensation of a vapor under saturated conditions?
- The energy radiated from a surface Q at absolute temperature T is related as__________?
- Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity ?
- Crystallisation of solids from a homogeneous solution is a/an __________ process?
- Steam condensate is recovered by steam traps and recycled for use as boiler feed water, because of its low__________?