# Chemical Engineering - Heat Transfer

### Exercise :: Heat Transfer - Section 1

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.

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.

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

Explanation:

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14.

For an ideal black body

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

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