Flows through the tube
Flows outside the tubes
Can flow either inside or outside the tubes
Should not be used as it gives very high pressure drop
✅ The correct answer is option B.
Heat Transfer MCQs
Fruit juice (a heat sensitive material) can be concentrated in a __________ evaporator.
Long tube
Falling film
High pressure
None of these
✅ The correct answer is option B.
A BTU/hr.ft.2 °F is equal to
1 kcal/hr. m²°C
4.88 kcal/hr. m.2°C
1 kcal/hr. m².°K
None of these
✅ The correct answer is option B.
Wavelength corresponding to the maximum energy is inversely proportional to the absolute temperature. This is __________ law.
Stefan’s
Dalton’s
Wien’s
Kirchoffs
✅ The correct answer is option C.
1000 kg of wet solids are to be dried from 60% to 20% moisture (by weight). The mass of moisture removed in kg is
520
200
400
500
✅ The correct answer is option C.
Forced circulation evaporators are normally used for concentrating liquids having
Scaling characteristics
High viscosity
Both A & B
Neither A nor B
✅ The correct answer is option C.
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is
Finned tube heat exchanger with air inside and steam outside
Finned tube heat exchanger with air outside and steam inside
Shell and tube heat exchanger with air inside tubes and steam on shell side
Shell and tube heat exchanger with air on shell side and steam inside tubes
✅ The correct answer is option B.
Natural convection is characterised by
Grashhoff number
Peclet number
Reynolds number
Prandtl number
✅ The correct answer is option A.
Radiation heat transfer rates does not depend upon the
Type of absorbing surface
Distance between the heat source and the object receiving the heat
Surface area and temperature of the heat source
None of these
✅ The correct answer is option D.
A multiple effect evaporator as compared to a single effect evaporator of the same capacity has
Lower heat transfer area
Lower steam economy
Higher steam economy
Higher solute concentration in the product
✅ The correct answer is option C.