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Heat Transfer

Heat Transfer
Open pan evaporators are preferred to be used, when the solution to be concentrated is

Corrosive
Scaling
Salty
Highly viscous

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Heat Transfer
Which is the most suitable for cold viscous feed?

Mixed feed
Backward feed
Forward feed
Parallel feed

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Heat Transfer
Controlling heat transfer film co-efficient is the one, which offers __________ resistance to heat transfer.

no
the least
the largest
lower

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Heat Transfer
The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is

Less
More
Some
Either more or less ; depends on the nature of vapor

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Heat Transfer
Vent pipes are provided in a condenser to

None of these
Facilitate easy cleaning of tubes
Remove non-condensable gases
Purge the condenser

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Heat Transfer
Grashoff number, which is defined as g . β(Ts - T∞) ρ². L³/μ², is proportional to the ratio of buoyancy force to __________ force.

Inertial
Elastic
None of these
Viscous

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