Process Equipment And Plant Design - Study Mode

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[#246] Liquid gradient over the tray results due to the

(A) Resistance offered to flow of liquids by caps & risers and the flow of gas

(B) Low gas velocity

(C) Large plate spacing

(D) Large reflux ratio

Correct Answer

(A) Resistance offered to flow of liquids by caps & risers and the flow of gas

[#247] Large process vessels operating under extreme temperature and pressure conditions are normally clad/ lined with materials like stainless steel, aluminium, nickel & its alloys, copper & its alloys and titanium. The cladding thickness is generally about __________ percent of the total thickness.

(A) 1 to 5

(B) 10 to 20

(C) 30 to 40

(D) 40 to 50

Correct Answer

(B) 10 to 20

[#248] Heat transfer co-efficient, h G (K cal /hr.m 2 .°C) and mass velocity of air, G (kg/hr.m 2 ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as h G = 0.0176 G 0.8 . But when the flow of air perpendicular to the surface is encountered, this equation changes to

(A) h G = 1.004 G 0.37

(B) h G = 1.004 G 0.8

(C) h G = 0.0176 G 0.37

(D) h G = 0.0176 G 1.37

Correct Answer

(A) h G = 1.004 G 0.37

[#249] In inclined long tube vertical evaporators, the tubes are inclined at an angle of

(A) 15°

(B) 90°

(C) 45°

(D) 60°

Correct Answer

(C) 45°

[#250] Which of the following packing materials provides for maximum mass transfer?

(A) Lessig rings

(B) Raschig rings

(C) Cross-partition rings

(D) All of the above

Correct Answer

(C) Cross-partition rings