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Heat Transfer

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

None of these
4.88
1
1.49

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Heat Transfer
In a single evaporator system, the steam economy __________ by creating vacuum in the evaporator.

Decreases
May increase or decrease, depends on the vacuum
Remains constant
Increases

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Heat Transfer
An insulator should have

Low thermal conductivity
High thermal conductivity
Less resistance to heat flow
A porous structure

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

Scaling
Corrosive
Salty
Highly viscous

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Heat Transfer
Dietus-Boelter equation used for the determination of heat transfer co-efficient is valid

none of the listed here
for fluids in laminar flow
for fluids in tubulent flow
when Grashhoff number is very important

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

Grashoff
Reynolds
Prandtl & Grashoff
Both A & B

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MORE MCQ ON Heat Transfer

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