0.2
0.4
0.6
0.8
✅ The correct answer is option C.
Engineering MCQs
Vent pipes are provided in a condenser to
Remove non-condensable gases
Purge the condenser
Facilitate easy cleaning of tubes
None of these
✅ The correct answer is option A.
The advantage of backward feed multiple effect evaporators over forward feed units is that
Heat sensitive material can be handled
There is no additional cost of pumping
Most concentrated liquid is at highest temperature
Equal heat transfer co-efficients exist in various effects
✅ The correct answer is option C.
The purpose of floating head in a heat exchanger is to
Avoid buckling of tubes
Provide support for tubes
Decrease the pressure drop
Facilitate its lengthening, if needed
✅ The correct answer is option A.
Nucleate boiling is promoted
On polished surfaces
On rough surfaces
In the absence of agitation
None of these
✅ The correct answer is option B.
For shell and tube heat exchanger, with increasing heat transfer area, the purchased cost per unit heat transfer area
Increases
Decreases
Remains constant
Passes through a maxima
✅ The correct answer is option D.
Conduction occurs in the buffer zone for a fluid flowing through a heated pipe, only when Prandtl number is
0.1
>1
< 1
L
✅ The correct answer is option A.
Fouling factor for a heat exchanger is given by (where, U₁ = heat transfer co-efficient of dirty surface U₂ = heat transfer co-efficient of clean surface)
U₁ – U₂
1/U₁ – 1/U₂
1/U₂ – 1/U₁
U₂ – U₁
✅ The correct answer is option B.
The equivalent diameter for pressure drop is __________ that for heat transfer.
Smaller than
Greater than
Equal to
Not related with
✅ The correct answer is option A.
Steam consumption in kg/hr in case of an evaporator is given by (where, C & E are capacity the economy of the evaporator respectively)
C/E
E/C
CE
1/CE
✅ The correct answer is option A.