4261. Rotary driers are most economically designed for the number of heat transfer units (HTU) from
0.01 to 1
1.5 to 2.5
5 to 10
10 to 20
✅ The correct answer is option B.
Chemical Engineering
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4262. Pick out the wrong statement about routing of fluids in a shell and tube heat exchanger.
The corrosive and fouling fluid should be preferably routed through the tubes.
The viscous fluid should be routed through the shell side.
Lower flow rate fluid should be routed through the shell side.
Higher pressure fluid stream should be routed through the shell side.
✅ The correct answer is option D.
4263. The average velocity in the tubes of a 1-4 heat exchanger is __________ times that in 1-1 heat exchanger having the same size & number of tubes and operated at same liquid flow rate.
2
1-Feb
4
1-Apr
✅ The correct answer is option C.
4264. The ratio for the rate of washing to the final rate of filtration in a washing type of plate and frame filter is
0.25
0.5
0.75
1.25
✅ The correct answer is option A.
4265. Theoretically calculated diameter of the stripping section of the continuous rectification column is __________ that of the enriching section.
less than
more than
same as
either more or less (depending upon relative volatility)
✅ The correct answer is option B.
4266. The minimum baffle height should be
equal to the impeller diameter.
twice the impeller diameter.
twice the tank diameter.
3/4 of the tank height.
✅ The correct answer is option B.
4267. At equal mass velocities, the values of film co-efficients for gases as compared to that for liquids are generally.
higher
lower
same
unpredictable
✅ The correct answer is option B.
4268. Pick out the wrong statement. In an agitated vertical cylinderical reaction vessel, the
ratio of liquid depth to tank diameter (i.e. the filling ratio) recommended for most purposes is 1.
filling ratio for dispersing gas in a liquid is 2 for sufficiently long contact period.
flat bottom and conical bottom vessels have low agitation efficiency for agitation of heavy solids in liquids.
dished bottom vessel has very high power consumption.
✅ The correct answer is option D.
4269. The ratio of tube length to shell diameter in case of liquid shell and tube heat exchanger ranges from
2 to 3
3 to 5
4 to 8
6 to 12
✅ The correct answer is option C.
4270. Shell side heat transfer co-efficient in case of square pitch as compared to the triangular pitch under similar condition of fluid flow and tube size is
more
same
less
twice
✅ The correct answer is option C.