Chemical Engineering - Process Equipment and Plant Design

16. 

The thermal stress in a metallic bar does not depend upon the

A. changes in temperature.
B. cross-sectional area.
C. both (a) and (b).
D. neither (a) nor (b).

Answer: Option B

Explanation:

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17. 

The minimum baffle height should be

A. equal to the impeller diameter.
B. twice the impeller diameter.
C. twice the tank diameter.
D. 3/4 of the tank height.

Answer: Option B

Explanation:

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18. 

For turbulent flow (NRe > 2100) of low viscosity fluid (μ > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft3/sec.ρ = fluid density, lb/ft3 μ = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches)

A. Di, opt = 3.9 Q0.45 ρ0.13
B. Di, opt = 3.9 Q0.45 . μ0.95
C. Di, opt = 4.7 Q0.36 . μ3.2ρ0.13
D. Di, opt = 3 Q0.36 . μ0.88

Answer: Option A

Explanation:

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19. 

To avoid the tearing off the plate of an edge, the margin (i.e., the minimum distance from the centre of the rivet hole to the nearest edge of the plate) should be equal to

A. 0.5 d
B. d
C. 1.5 d
D. 2.5 d

Answer: Option C

Explanation:

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20. 

The normal range of velocity of water in pipes is __________ m/sec.

A. 0.1-0.5
B. 1-2
C. 10-50
D. 15-30

Answer: Option B

Explanation:

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