hG = 1.004G0.37
1.004G0.8
hG = 0.0176G0.37
0.0176G1.37
✅ The correct answer is option A.
Process Equipment and Plant Design MCQs
172. Which of the following is the best tube material from thermal conductivity point of view alone?
Aluminium
Stainless steel
Copper
Carbon steel
✅ The correct answer is option C.
173. Minimum tube pitch recommended for shell and tube heat exchangers is about __________ times the outside diameter of the tube.
1.25
1.75
2.5
3.5
✅ The correct answer is option A.
174. In the design of a paddle agitator, the ratiois normally taken as
0.1
0.8
0.25
0.5
✅ The correct answer is option B.
175. Maximum acceptable total liquid gradient over a tray is about __________ mm.
5.5
12.5
30.5
45.5
✅ The correct answer is option B.
176. For a cylinderical vessel of moderate height, the weld joint efficiency for joints parallel to the cylinderical axis is given as 1.0, while for joints along the girth (circumference) it is given as 0.8. In calculating the shell wall thickness using code formula for an internally pressurised cylinderical vessel, what value of weld joint efficiency should be used ?
0.8
0.9
1
(0.8)0.5
✅ The correct answer is option A.
177. Value of Peclet number = ∞, is the representative of
laminar flow.
complete back mixing,
plug flow.
eddy diffusivity = 0.
✅ The correct answer is option C.
178. The main purpose of providing stepping on the trays is to
increase the residence time.
decrease the pressure drop.
facilitate handling of large flow rate of liquid.
improve the flow condition.
✅ The correct answer is option C.
179. Diameter of the seive tray column is determined by the
lower limit of vapour velocity.
upper limit of the vapour velocity.
hole diameter of the seive tray.
height of the plate spacing.
✅ The correct answer is option B.
180. Hazards associated with the relief valve leakage for extremely hazardous material storage can be taken care of by providing
rupture diaphragm
dikes
surge chamber
none of these
✅ The correct answer is option A.