Process Equipment and Plant Design

91. For storing hazardous chemicals in large storage tanks, the minimum safe distance between the two tanks should range between _________ times the tank diameter.

1. 1 to 1.5
2. 2.5 to 3.5
3. 4 to 5
4. 6 to 8

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92. For turbine agitator, the impeller diameter is about

1. 0.3 to 0.5 d
2. 0.1 to 0.2 d
3. 0.65 to 0.85 d
4. 0.95 d

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93. For turbulent flow (N_Re > 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)

1. D_{i, opt} = 3.9 Q^0.45 ρ^0.13
2. D_{i, opt} = 3.9 Q^0.45 μ^0.95
3. D_{i, opt} = 4.7 Q^0.36 μ^3.2ρ^0.13
4. D_{i, opt} = 3 Q^0.36. μ^0.88

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94. Fouling factor must be included in the calculation of overall design heat transfer coefficient, when the liquid

1. Containing suspended solids flows at low velocity
2. Containing suspended solids flows at high velocity
3. Is highly viscous
4. Is of high specific gravity

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95. Frame thickness in the plate and frame filter press is normally in the range of _________ inches.

1. 0.25 to 4
2. 0.25 to 8
3. 1 to 5
4. 1 to 12

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96. Fresh water carrying pipelines in chemical industries are coloured with _________ color.

1. Sea green
2. Brown
3. Yellow
4. Red

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97. Friction factor for turbulent flow in a new pipe is given by

1. f = 16/N_Re
2. f = 0.04/(N_Re)^0.16
3. f = 0.22 N_Re^0.5
4. f = 25/N_Re

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98. Generally, as the length of the liquid path on a tray is increased beyond 5 ft, the overall column efficiency

1. Increases
2. Decreases
3. Remain same
4. May increase or decrease depending upon the plate spacing

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99. Generally, elliptical dished heads

1. Are manufactured on 2:1 ratio of major to minor axis and is recommended to be used for pressure vessels operating above a pressure of 1.5 MN/m²
2. Resist half the pressure rating compared to hemi spherical head provided on the cylindrical shell of the same thickness and diameter
3. Are approximately as strong as seamless cylindrical shell having the corresponding I.D and O.D
4. All (A), (B) and (C)

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100. Generally, no corrosion allowance in wall thickness of a part is required, if the thickness is more than _________ mm.

1. 10
2. 20
3. 30
4. 5

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