Users Also Read
Read MCQ's/Objective questions
MCQ's Search Engine
Chemical Engineering Basics
Chemical Engineering Plant Economic
Chemical Engineering Thermodynamic
Chemical Process Industries
Chemical Reaction Engineering & reactor design
Environmental Engineering
Fertiliser Technology
Fluid Mechanics
Fuels and Combustion
Furnace Technology
Mass Transfer
Materials and Construction
Mechanical Operations
Nuclear Power Engineering
Petroleum Refinery Engineering
Polymer Technology
Process Control and Instrumentation
Process Equipment and Plant Design
Refractory Technology
Stoichiometry
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. |
Q41 ⇒ The actual temperature drop across the heating surface in an evaporator depends on the all (a), (b) and (c). [other wrong options] [Discuss in forum] feed. depth of liquid over heating surface. pressure difference between steam chest and vapour space. |
Q42 ⇒ Presence of a non-condensing gas in a condensing vapour none of these. [other wrong options] [Discuss in forum] increases the rate of condensation. decreases thermal resistance. is desirable to increase the film co-efficient. |
Q43 ⇒ In case of a shell and tube heat exchanger, the minimum and maximum baffle spacing is respectively (where, D = inside diameter of the shell) D/5 and D [other wrong options] [Discuss in forum] D/2 and 2 D D/4 and 2 D D and 2 D |
Q44 ⇒ The number of kg vaporised per kg of steam fed to the evaporator is defined as economy [other wrong options] [Discuss in forum] capacity rate of evaporation rate of vaporisation |
Q45 ⇒ Thermal conductivity of a conducting solid material depends upon its both (a) & (b) [other wrong options] [Discuss in forum] temperature porosity neither (a) nor (b) |
Q46 ⇒ A composite wall consists of two plates A and B placed in series normal to the flow of heat. The thermal conductivities are kA and kB and the specific heat capacities are CPA and CPB for plates A and B respectively. Plate B has twice the thickness of plate A. At steady state, the temperature difference across plate A is greater than that across plate B, when kA < 0.5kB [other wrong options] [Discuss in forum] CPA > CPB CPA < CPB kA>2 kB |
Q47 ⇒ Controlling heat transfer film co-efficient is the one, which offers __________ resistance to heat transfer. the largest [other wrong options] [Discuss in forum] no the least lower |
Q48 ⇒ The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is Schmidt number. [other wrong options] [Discuss in forum] Nusselt number. Sherwood number. Stanton number. |
Q49 ⇒ The unit of heat transfer co-efficient is BTU/hr. ft2°F [other wrong options] [Discuss in forum] BTU/hr. °F. ft. BTU/hr. °F BTU/hr. ft |
Q50 ⇒ Which area is used in case of heat flow by conduction through a cylinder ? Logarithmic mean area [other wrong options] [Discuss in forum] Arithmetic mean area Geometric mean area None of these |
Q51 ⇒ Resistance to heat flow by conduction is proportional to (where, t & ρ are thickness & density of the material respectively and A = area normal to the direction of heat flow. ) all (a), (b) & (c) [other wrong options] [Discuss in forum] t 1/ρ 1/A |
Q52 ⇒ Multiple effect evaporators ar used to increase the steam economy & the capacity. [other wrong options] [Discuss in forum] increase the steam economy & decrease the capacity. decrease the steam economy & the capacity. decrease the steam economy & increase the capacity. |
Q53 ⇒ For large heat transfer area requirement, shell and tube heat exchanger is preferred, because it all (a), (b) and (c). [other wrong options] [Discuss in forum] occupies smaller space. is more economical. is easy to operate and maintain. |
Q54 ⇒ It is not preferable to use superheated steam in evaporators, because of its very low film co-efficient [other wrong options] [Discuss in forum] high temperature high pressure none of these |
Q55 ⇒ 'Duhring's plot' is of use in evaporation [other wrong options] [Discuss in forum] extractive distillation leaching absorption |
Q56 ⇒ What is the unit of thermal conductivity ? Kcal/hr.m.°C [other wrong options] [Discuss in forum] Kcal/hr. m2 °C Kcal/hr.m Kcal/hr. °C |
Q57 ⇒ Solid angle subtended by the finite surface at the radiating element is called the angle of vision. [other wrong options] [Discuss in forum] called the view factor. proportional to the square of the distance between surfaces. expressed in terms of radians. |
Q58 ⇒ In Biot number, the characteristic length used is the ratio of the __________ of the solid. volume to surface area [other wrong options] [Discuss in forum] perimeter to surface area surface area to volume surface area to perimeter |
Q59 ⇒ Economy of a multiple effect evaporator depends upon the heat balance consideration [other wrong options] [Discuss in forum] rate of heat transfer both (a) and (b) neither (a) nor (b) |
Q60 ⇒ Pick out the wrong statement: With change in temperature, the radiant energy emitted by a black body remains unchanged. [other wrong options] [Discuss in forum] Absorptivity of a body approaches unity in case of diffuse reflection. Absorptivity of a perfectly black body is unity. Value of Stefan-Boltzman constant is 4.876 x 10-8 KCal/m2.hr.°K4. |
Or |