Top 1000+ Solved Heat Transfer (HT) MCQ Questions Answer
Q. Which is the most suitable for the concentration of foamy & frothy liquors?
a. Agitated film evaporator
b. Long tube vertical evaporator
c. Open pan evaporator
d. None of these
Q. Heat transfer by radiation between two bodies at T1 & T2 and in an ambient temperatureof Ta°C depends on
a. T1 - T2
b. T1 - Ta
c. T2 - Ta
d. None of these
Q. Air is best heated with steam in a heat exchanger of
a. Plate type
b. Double pipe type with fin on steam side
c. Double pipe type with fin on air side
d. Shell and tube type
Q. The film thickness for laminar film condensation on vertical surface __________ from topto bottom.
a. Cumulatively increases
b. Cumulatively decreases
c. Remain constant
d. And the surface conductance increase
Q. __________ paint has the minimum absorption co-efficient.
a. Black
b. White lead
c. Grey
d. Light cream
Q. The value of Stefan-Boltzmann constant in SI unit is
a. 5.6697 × 10-8W/m2.°K4
b. 0.1714 × 10-8W/m2.°K4
c. 5.6697 × 10-8kcal/m2. °K4
d. 0.1714 × 10-8kcal/m2. °K4
Q. For shell and tube heat exchanger, with increasing heat transfer area, the purchased costper unit heat transfer area
a. Increases
b. Decreases
c. Remain constant
d. Passes through a maxima
Q. Mode of heat transfer in which the fluid moves under the influence of changes in fluidpressure produced by external work is called
a. Radiation
b. Natural convection
c. Forced convection
d. Conduction
Q. The ratio of momentum diffusivity to thermal diffusivity is the __________ number.
a. Prandtl
b. Nusselt
c. Stanton
d. Grashoff
Q. Steam traps are provided in steam carrying pipelines to
a. Condense steam
b. Release excess steam pressure by bleeding steam
c. Remove condensate and inert gases
d. None of these
Q. Heat transfer occurs by natural convection because change in temperature causesdifference in
a. Viscosity
b. Density
c. Thermal conductivity
d. Heat capacity
Q. Log mean temperature difference (LMTD) cannot be used, if
a. Heat transfer co-efficient over the entire heat exchanger is not constant
b. There exists an unsteady state
c. The heat capacity is not constant and there is a phase change
d. None of these