Process Equipment And Plant Design - Study Mode

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[#241] The clearance between two tubes in a shell and tube heat exchanger is known as 'ligament', whose minimum value is __________ the outside diameter of the tube, but in no case it should be less than 4.5 mm.

(A) Equal to

(B) Half

(C) One fourth

(D) Three fourth

Correct Answer

(C) One fourth

[#242] For a given fluid, as the pipe diameter increases, the pumping cost

(A) Decreases

(B) Increases

(C) Remains unaffected

(D) May increase or decreaes depending upon whether the fluid is Newtonian or non-Newtonion

Correct Answer

(A) Decreases

[#243] Cylinderical shell thickness of rotary drier is generally __________ mm.

(A) 2-3

(B) 18-22

(C) 6-8

(D) 12-15

Correct Answer

(C) 6-8

[#244] A cylinderical pressure vessel of volume 6 πm 3 has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125 N/mm 2 and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to

(A) 5 mm

(B) 6 mm

(C) 8 mm

(D) 10 mm

Correct Answer

(D) 10 mm

[#245] The distance between the top of the slots and the liquid surface when the static liquid is just ready to flow over the overflow weir is called

(A) Downcomer liquid seal

(B) Static submergence

(C) Skirt clearance

(D) None of these

Correct Answer

(B) Static submergence