Chemical Engineering - Heat Transfer

1. 

A __________ evaporator employs an annular downtake.

A. basket type
B. horizontal
C. long tube vertical
D. none of these

Answer: Option A

Explanation:

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2. 

Radiation heat losses from satisfactorily insulated high pressure boilar may be about __________ percent.

A. 1
B. 7
C. 18
D. 26

Answer: Option B

Explanation:

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3. 

In natural convection heat transfer, the correlating parameter is the

A. Graetz number
B. Eckert number
C. Grashoff number
D. Bond number

Answer: Option C

Explanation:

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4. 

Boiling of milk in an open vessel is an example of __________ boiling.

A. film
B. sub-cooled
C. saturated nucleate
D. none of these

Answer: Option A

Explanation:

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5. 

Pick out the wrong statement.

A. In process heat exchangers, saturated steam is preferred over the superheated steam.
B. The maximum is the emissive power of a surface at a temperature T1 occurs at a wavelength of λ1. If the surface temperature is halved, the maximum in the emissive power would occur at a wavelength of 0.5 λ1.
C. When a vertical plate is heated in infinite air environmental under natural convection conditions, the velocity profile in air, normal to the plate, exhibits a maximum.
D. A body at 925 K emits an energy of 1.42 x 1011σW/m2 (σ is the Stefan-Boltzman constant) in the wavelength band between 3 μm to 4 μm. The fraction of this energy in the total energy emitted over the entire wavelength range is equal to emissivity.

Answer: Option B

Explanation:

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