1592. ‘Duhring’s plot’ is of use in
Extractive distillation
Evaporation
Leaching
Absorption
✅ The correct answer is option B.
1594. Leidenfrost point is a term concerned with the
Condensation of the saturated vapor on a cold surface
Concentration of a corrosive solution by evaporation
Heat transfer between two highly viscous liquids
Boiling of a liquid on a hot surface
✅ The correct answer is option D.
1596. The sum of reflectivity and absorptivity for an opaque body is equal to
0.5
1
0
2
✅ The correct answer is option B.
1598. At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe?
0.5
< 0.5
> 0.6
< 0.1
✅ The correct answer is option C.
1600. Among liquids, water has a comparatively high value of thermal conductivity, due to its
Low density
High viscosity
Partial ionisation
Dense structure
✅ The correct answer is option C.
1563. 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.
1566. Which area is used in case of heat flow by conduction through a cylinder?
Logarithmic mean area
Arithmetic mean area
Geometric mean area
None of these
✅ The correct answer is option A.
1569. Steam traps are provided in steam carrying pipelines to
Condense steam
Release excess steam pressure by bleeding steam
Remove condensate and inert gases
None of these
✅ The correct answer is option C.
1572. In thermal radiation for a black body (where, ε is emissivity and α is absorptivity)
α = 1; ε ≠ 1
α ≠ 1, ε = 1
α ≠ 1, ε ≠ 1
α = 1; ε = 1
✅ The correct answer is option D.
1575. With the increase of temperature, the Col-burn jH factor
Increases
Decreases
Remains unchanged
May increase or decrease ; depending on temperature
✅ The correct answer is option A.