Steam
Condensate
Non-condensables
None of these
✅ The correct answer is option B.
Engineering
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1452. Rate of heat transfer by vaporisation from pools of water is affected by the
Nature of heating surface and distribution of bubbles
Surface tension of water
Viscosity of water
All of the above
✅ The correct answer is option D.
1453. Maximum heat transfer rate is achieved in __________ flow.
Co-current
Counter-current
Turbulent
Laminar
✅ The correct answer is option C.
1454. The wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body)
αT
α 1/T
α T⁴
Independent of T
✅ The correct answer is option B.
1455. The thickness of condensate layer in filmwise condensation depends on the
Condensation rate
Surface configuration
Liquid flow rate from the surface
All of the above
✅ The correct answer is option D.
1456. ‘Fouling factor’ used in the design of a multipass shell and tube heat exchanger is a
Non-dimensional factor
Factor of safety
Conversion factor for individual film heat transfer co-efficient to overall heat transfer co-efficient
None of these
✅ The correct answer is option B.
1457. In forced convection, the heat transfer depends on
Re, Pr
Re, Gr
Mainly Gr
Re only
✅ The correct answer is option A.
1458. For hot feed, forward feeding as compared to backward feeding results in __________ economy.
Increased
Decreased
No effect on
None of these
✅ The correct answer is option A.
1459. Prandtl and Reynolds analogy are same, when Prandtl number is
0.5
1
> 2
1.5
✅ The correct answer is option B.
1460. Log mean temperature difference (LMTD) cannot be used, if
Heat transfer co-efficient over the entire heat exchanger is not constant
There exists an unsteady state
The heat capacity is not constant and there is a phase change
None of these
✅ The correct answer is option D.