A. Glazed
B. Oily
C. Coated
D. Smooth
Related Mcqs:
- The heat transfer co-efficient in film type condensation is _______________ that for dropwise condensation?
A. Greater than
B. Lower than
C. Is same as
D. Half - The most conducive surface for dropwise condensation to occur is the _____________ surface?
A. Coated
B. Oily
C. Glazed & polished
D. Smooth - Dropwise condensation occurs on ______________ surfaces?
A. Clean and dirt free
B. Smooth clean
C. Contaminated cooling
D. Polished - Film condensation is promoted on a/an _______________________ surface?
A. Oily
B. Coated
C. Clean & smooth
D. Dirty - For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then__________________?
A. hf = hd
B. hf > hd
C. hf < hd
D. hf could be greater or smaller than hd - The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness) _________________?
A. ∝ t
B. ∝ 1/t
C. ∝ √t
D. Independent of ‘t’ - The film thickness for laminar film condensation on vertical surface _____________ from top to bottom?
A. Cumulatively increases
B. Cumulatively decreases
C. Remain constant
D. And the surface conductance increase - Nucleate boiling is promoted ___________________?
A. On polished surfaces
B. On rough surfaces
C. In the absence of agitation
D. None of these - Removal of ______________ heat is involved in the condensation of a vapor under saturated conditions?
A. Super
B. Sensible
C. Latent
D. Both B. & C. - 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
