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Heat Transfer

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

1.49
4.88
None of these
1

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Heat Transfer
Which type of heat exchanger is preferred for heavy heat loads ?

None of the listed here
Series and parallel set of shell and tube
Plate fine
Double pipe

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Heat Transfer
In a forward feed multiple effect evaporator unit

Transfer from effect to effect is done by pumps
None of these
No pump is required to withdraw the product from the last effect
Viscosity of liquid is highest in first effect

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Heat Transfer
Thermal conductivity of a gas at low density, __________ with increase in temperature.

May increase or decrease; depends on the gas
Increases
Remains unchanged
Decreases

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Heat Transfer
A backward feed multiple effect evaporator is better than forward feed for concentrating cold feed, because it provides

Lower capacity
Lower economy
Both A & B
Higher economy

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Heat Transfer
What is the geometric mean of two heat transfer areas A₁ and A₂ ?

2 √(A₁ . A₂)
√(A₁ . A₂)
√(A₁ + A₂)
1/2 √(A₁ . A₂)

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