more than
not greater than
not less than one fifth of
both (b) and (c)
✅ The correct answer is option D.
Engineering
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4102. Pick out the wrong statement
In a flanged and standard dished head, the crown radius is ≤ shell outside diameter.
In a flanged and shallow dished head, the crown radius is > shell outside diameter.
Flat head covers are most suitable for larger vessels operating at very high pressure.
Flanged only head is a type of flat head in which gradual change in the shape at the centre results in reduced local stresses.
✅ The correct answer is option C.
4103. Steam side heat transfer co-efficient for design consideration under ordinary condition can be assumed to be about __________ kcal/hr.m2.°C.
1250
2500
7500
15000
✅ The correct answer is option C.
4104. Needle valves are generally not used for
very large diameter pipes.
high pressure throttling service.
very accurate flow control.
smaller sizes of pipe.
✅ The correct answer is option A.
4105. Pick out the wrong statement pertaining to the design of the bubble cap tray of a distillation column to give stable operation and even vapour distribution.
The pressure drop due to the caps & slots and the static submergence should be as high as practicable for reasonable operation.
Tendency towards stable operation is increased by increasing the skirt clearance of the caps, lowering the rate of liquid flow per unit plate width or increasing the spacing between the caps.
The dimensionless ratio of liquid gradient to pressure drop head caused by the bubble cap assembly should be less than 0.4.
none of these.
✅ The correct answer is option D.
4106. 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.
equal to
half
one fourth
three fourth
✅ The correct answer is option C.
4107. Friction factor for turbulent flow in a new pipe is given by
f = 0.22 NRe0.5
✅ The correct answer is option B.
4108. Baffles may be eliminated for
low viscosity liquids (< 200 poise).
high viscosity liquids (> 600 poise).
large diameter tanks.
none of these.
✅ The correct answer is option B.
4109. A cylindrical storage tank can have a self supported conical roof,
if its diameter is less than 15-20metres.
if its diameter is more than 50 meters.
if the thickness of the roof is more than that of the cylindrical shell.
irrespective of its diameter.
✅ The correct answer is option A.
4110. The dust collection efficiency of electrostatic precipitator increases with increase in the
gas flow rate.
electrode area.
both (a) & (b).
neither (a) nor (b).
✅ The correct answer is option B.