A higher capacity
A lower capacity
Lower economy
None of these
✅ The correct answer is option A.
Heat Transfer MCQs
Heat waves
Can not pass through vacuum
Travel in straight line
Can be reflected by a mirror
Both B and C
✅ The correct answer is option D.
In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used
In low range of temperature differences
In high range of temperature differences
Because of its low cost
To prevent corrosion of the tube bundles
✅ The correct answer is option B.
Increasing the liquor level in the evaporator results in the
Decreased capacity
Increase in liquor film co-efficient
Decreased effect of hydrostatic head
Increased true temperature drop
✅ The correct answer is option A.
Terminal point temperature differences between fluids in case of a heat exchanger is termed as
Approach
Log mean temperature difference
Arithmetic mean temperature difference
Geometric mean temperature difference
✅ The correct answer is option A.
In a shell and tube heat exchanger, the shell side fluid velocity can not be changed by changing the
Tube layout
Tube diameter
Tube pitch
No. of baffles
✅ The correct answer is option B.
Indirect contact heat exchangers are preferred over direct contact heat exchangers, because
Heat transfer co-efficient are high
There is no risk of contamination
There is no mist formation
Cost of equipment is lower
✅ The correct answer is option B.
In a forward feed multiple effect, the pressure build up will be
Least at the inlet of the first effect
Least at the outlet of the last effect
Highest at the inlet of the last effect
Highest at the outlet of the last effect
✅ The correct answer is option B.
It is desired to concentrate a 20% salt solution (20 kg of salt in 100 kg of solution) to a 30% salt solution in an evaporator. Consider a feed of 300 kg/min at 30°C. The boiling point of the solution is 110°C, the latent heat of vaporisation is 2100 kJ/kg and the specific heat of the solution is 4 kJ/kg.K. The rate at which the heat has to be supplied in (kJ/min) to the evaporator is
3.06 x l0⁵
6.12 x 10⁵
7.24 x 10⁵
9.08 x 10⁵
✅ The correct answer is option A.
Multiple effect evaporators are commonly used in the manufacture of P. Paper Q. Superphosphate R. Sugar S. Fats
P and Q
P and R
P and S
R and S
✅ The correct answer is option C.