Related Questions

The film thickness for laminar film condensation on vertical surface __________ from top to bottom.
A Cummulatively increases
B Cummulatively decreases
C Remains constant
D And the surface conductance increase
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
In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by
A Convection
B Radiation
C Conduction
D Both convection and conduction
The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is
A d > m > e
B d > e > m
C e > m > d
D e > d > m
The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be
A Parabolic
B Hyperbolic
C Straight line
D None of these
Film condensation is promoted on a/an __________ surface.
A Oily
B Coated
C Clean & smooth
D Dirty
The thickness of condensate layer in filmwise condensation depends on the
A Condensation rate
B Surface configuration
C Liquid flow rate from the surface
D All of the above
The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be (where D is the depth of flow)
A 0.423 D
B 0.577 D
C 0.223 D
D 0.707 D
The most conducive surface for dropwise condensation to occur is the __________ surface.
A Coated
B Oily
C Glazed & polished
D Smooth
CGS system এ পরিবাহিতা (conductance) এর একক কি?
A rad
B ampere
C ohm
D volt

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