## Lakshya Education MCQs

Question: The average heat transfer co-efficient for laminar film condensation on vertical surface is inversely proportional to (where, ΔT = Temperature drop across condensate film )
Options:
 A. (ΔT)2 B. √ΔT C. (ΔT)1/4 D. (ΔT)3/2

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## More Questions on This Topic :

Question 1. Multiple effect evaporators ar used to
1.    Increase the steam economy & decrease the capacity
2.    Increase the steam economy & the capacity
3.    Decrease the steam economy & the capacity
4.    Decrease the steam economy & increase the capacity
Question 2. Pick out the wrong statement.
1.    The condensing film co-efficient is about 3 times lower for vertical condenser as compared to the equivalent horizontal condenser for identical situation
2.    Film co-efficient for vaporisation decreases as a result of vapor binding
3.    In industrial practice, sub-cooling of condensate is required, when the condensate is a volatile liquid and is to be transferred for storage
4.    Overall heat transfer co-efficient in a heat exchanger is controlled by the value of the film co-efficient, which is higher
Question 3. Heat flux increases with temperature drop beyond the Leiden frost point in the plot of heat flux vs. temperature drop for a boiling liquid, because
1.    Convection becomes important
2.    Conduction becomes important
4.    Sub-cooled boiling occurs
Question 4. Tube pitch is the __________ of tube diameters and the clearances.
1.    Sum
2.    Difference
3.    Ratio
4.    None of these
Question 5. In a shell and tube heat exchanger, the height of 25 percent cut baffles is equal to (where, D = inside diameter of shell)
1.    0.25 D
2.    0.75 D
3.    0.50 D
4.    None of these