the most suitable for thick vertical vessel.
same as bracket support.
provided usually for vessels of much smaller height than skirt supported vessels.
all (a), (b) and (c).
✅ The correct answer is option D.
Engineering
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4202. The testing pressure of storage tanks and pressure vessels designed as per Indian standard codes should be about __________ times.the design pressure.
1.5 to 2
3 to 4
4 to 5
>5
✅ The correct answer is option A.
4203. 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.
4204. Height equivalent to a theoretical plate (HETP) is the height of packing that will give the same separation as one theoretical plate in gas-liquid mass transfer operations like distillation, absorption/stripping and humidification/dehumidification. HETP which is experimentally determined, depends upon the
flow rates of each fluid.
type and size of packing.
concentration of each fluid.
all a, b & c.
✅ The correct answer is option D.
4205. 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.
4206. Cooling water fouling factors vary in the range of 0.001 to 0.003
(BTU/hr.ft2 . °F)-1
(kcal/hr.m2 .°C)-1
(W/m2.°K)-1
(kcal/hr. m. °C)-1
✅ The correct answer is option A.
4207. Stage efficiency for packed tower varies with the
type & size of packing.
fluid rates and fluid properties.
operating pressure and column diameter.
all (a), (b) and (c).
✅ The correct answer is option D.
4208. 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.
4209. Heat transfer co-efficient, hG(Kcal/hr.m2 .°C) and mass velocity of air, G (kg/hr.m2 ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to
hG = 1.004G0.37
1.004G0.8
hG = 0.0176G0.37
0.0176G1.37
✅ The correct answer is option A.
4210. Minimum baffle spacing recommended in a shell and tube heat exchanger is equal to
5 cms
40% of the I.D. of the shell
25 cms
I.D. of the shell
✅ The correct answer is option A.