Chemical Engineering - Heat Transfer

1. 

Choose the correct equation.

A. Nu = (Re) (Pr) (Gz)
B. Nu = (Re) (Pr) (St)
C. Nu = (Re)(Pr)
D. Nu = (Pr)(St)

Answer: Option B

Explanation:

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2. 

In a forward feed multiple effect evaporator unit

A. viscosity of liquid is highest in first effect.
B. transfer from effect to effect is done by pumps.
C. no pump is required to withdraw the product from the last effect.
D. none of these.

Answer: Option D

Explanation:

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3. 

In case of heat flow by conduction for a cylindrical body with an internal heat source, the nature of temperature distribution is

A. linear
B. hyperbolic
C. parabolic
D. none of these

Answer: Option C

Explanation:

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4. 

For heat flow through very thick walled cylinder, use____mean radius.

A. arithmetic
B. logarithmic
C. geometric
D. either (a) or (c)

Answer: Option B

Explanation:

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5. 

Indirect contact heat exchangers are preferred over direct contact heat exchangers, because

A. heat transfer co-efficient are high.
B. there is no risk of contamination.
C. there is no mist formation.
D. cost of equipment is lower.

Answer: Option B

Explanation:

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