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Heat Transfer

Heat Transfer
1 BTU/hr.ft.°F is equal to __________ kcal/hr. m.°C.

4.88
1.49
1
None of these

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Heat Transfer
Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer.

Reynolds
Both A & B
Prandtl & Grashoff
Grashoff

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Heat Transfer
Nusselt number (for forced convection heat transfer) is a function of the __________ number.

Reynolds
Both Reynolds & Prandtl
None of the listed here
Prandtl

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Heat Transfer
A body cools down from 75°C to 70°C in 10 minutes. It will cool down from 70° C to 65° C in __________ minutes.

>10
10
Either B or C, depends on the mass of the body

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Heat Transfer
For a cold dilute feed to produce thick viscous liquor, backward feeding as compared to forward feeding results in

Decreased economy
No effect on economy
Lower capacity
Increased economy

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Heat Transfer
The capacity of double-effect evaporator is less than half of the capacity of two single effects, each of which is operating over same terminal temperature difference, when the

None of these
Evaporators opreate at atmospheric pressure
Evaporators operate under vacuum
Solution has an elevation of boiling point

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