Chemical Engineering - Heat Transfer

1. 

What is the steam economy in case of a single effect evaporator system ?

A. 1
B. >1
C. < 1
D. 0.1

Answer: Option C

Explanation:

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2. 

If average heat transfer co-efficient is ha and the local coefficient at the end of the plate is hl then in case of heat transfer to a fluid flowing over a flat plate, heated over its entire length

A. ha = hl
B. ha = 2hl
C. ha = 0.5 hl
D. ha = 0.75 hl

Answer: Option B

Explanation:

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3. 

jH factor for heat transfer is not a function of the __________ number.

A. Reynolds
B. Nusselt
C. Grashoff
D. both (b) & (c)

Answer: Option D

Explanation:

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4. 

The Fourier number (defined as a.t/L2) is used in the analysis of problem involving heat transfer by

A. forced convection
B. natural convection
C. transient conduction
D. steady state conduction

Answer: Option C

Explanation:

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5. 

The energy radiated from a surface Q at absolute temperature T is related as

A. QT2
B. QT4
C. QT3
D. none of these

Answer: Option B

Explanation:

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