Chemical Engineering - Heat Transfer

11. 

Shell side pressure drop in a shell and tube heat exchanger does not depend upon the

A. baffle spacing & shell diameter.
B. tube diameter & pitch.
C. viscosity, density & mass velocity of shell side fluid.
D. none of these.

Answer: Option D

Explanation:

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12. 

In the equation Q = UAΔt; Δt is

A. geometric mean temperature difference.
B. arithmetic mean temperature difference.
C. logarithmic mean temperature difference.
D. the difference of average bulk temperatures of hot and cold fluids.

Answer: Option C

Explanation:

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13. 

With increase in porosity, the thermal conductivity of a solid substance

A. increases
B. decreases
C. remains unchanged
D. may increase or decrease; depends on the solid

Answer: Option B

Explanation:

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14. 

For an ideal black body

A. absorptivity = 1
B. reflectivity = 1
C. emissivity = 0
D. transmissivity = 1

Answer: Option A

Explanation:

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15. 

In Joule's experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms-2. Neglecting the heat capacity of agitator, the temperature of water (in °C) is

A. 40.5
B. 34.4
C. 26.8
D. 25

Answer: Option B

Explanation:

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