Top 1000+ Solved Heat Transfer (HT) MCQ Questions Answer
Q. Steady state one dimensional heat flow by conduction as given by Fourier's low does notassume that
a. There is no internal heat generation
b. Boundary surfaces are isothermal
c. Material is anisotropic
d. Constant temperature gradient exists
Q. A backward feed multiple effect evaporator is better than forward feed for concentratingcold feed, because it provides
a. Higher economy
b. Lower capacity
c. Both (A) & (B)
d. Lower economy
Q. Analogy between mass and heat transfer is not applicable in case of
a. Same velocity profile or equal eddy diffusivities
b. Thermal or pressure mass diffusion
c. Viscous heating or chemical reaction
d. Both (B) and (C)
Q. Heat waves
a. Cannot pass through vacuum
b. Travel in straight line
c. Can be reflected by a mirror
d. Both (B) and (C)
Q. If air (a non-condensing gas) is present in a condensing vapor stream, it will __________the condensation rate of vapor.
a. Increase
b. Decrease
c. Not affect
d. Increase the condensing film co-efficient as well as
Q. The most conducive surface for dropwise condensation to occur is the __________ surface.
a. Coated
b. Oily
c. Glazed & polished
d. Smooth
Q. For a perfectly transparent surface (like gases), the
a. Absorptivity = 0
b. Transmissivity = 1
c. Reflectivity = 0
d. All (A), (B) & (C)
Q. Shell side pressure drop in a shell and tube heat exchanger does not depend upon the
a. Baffle spacing & shell diameter
b. Tube diameter & pitch
c. Viscosity, density & mass velocity of shell side fluid
d. None of these
Q. In evaporators, lowering the feed temperature
a. Increases the heating area required
b. Reduces the economy
c. Both (A) and (B)
d. Decreases the heating area required
Q. In case of vertical tube evaporator, with increase in liquor level, the overall heat transferco-efficient
a. Increases
b. Decreases
c. Is not affected
d. May increase or decrease; depends on the feed