Chemical Engineering - Heat Transfer

1. 

The type of liquor circulation system to be ' employed in evaporators (viz. natural or forced circulation) is determined mainly by the __________ of the liquid.

A. viscosity
B. density
C. thermal conductivity
D. corrosive nature

Answer: Option A

Explanation:

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2. 

In case of surface condensers, a straight line is obtained on plotting __________ on an ordinary graph paper.

A. 1/-0.8
B. -0.8
C. -2
D. 1/-2

Answer: Option A

Explanation:

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3. 

Thermal diffusivity is the most important in heat transfer by

A. conduction
B. radiation
C. condensation
D. natural convection

Answer: Option A

Explanation:

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4. 

(NGr x NPr) is called the __________ number.

A. Graetz
B. Reyleigh
C. Nusselt
D. Stanton

Answer: Option B

Explanation:

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5. 

A dephlegmator is a

A. total condenser
B. vacuum evaporator
C. partial condenser
D. double pipe heat exchanger

Answer: Option C

Explanation:

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