Heat Transfer
Vent pipes are provided in a condenser to

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

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Heat Transfer
Fouling factor

Is a dimensionless quantity
Does not provide a safety factor for design
None of these
Accounts for additional resistances to heat flow

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Heat Transfer
The advantage of backward feed multiple effect evaporators over forward feed units is that

Heat sensitive material can be handled
There is no additional cost of pumping
Equal heat transfer co-efficients exist in various effects
Most concentrated liquid is at highest temperature

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