Called the view factor
Called the angle of vision
Proportional to the square of the distance between surfaces
Expressed in terms of radians
✅ The correct answer is option B.
Engineering
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1502. Dropwise condensation occurs on __________ surfaces.
Clean and dirt free
Smooth clean
Contaminated cooling
Polished
✅ The correct answer is option C.
1503. Vibrations in the tubes of a shell and tube heat exchanger is induced due to the
Flow of fluid on the tube and shell sides
Oscillations in the flow of shell/tube sides fluid
Vibrations transmitted through piping and/or supports due to external reasons
All of the above
✅ The correct answer is option D.
1504. The energy radiated from a surface Q at absolute temperature T is related as
Q ∝ T²
Q ∝ T⁴
Q ∝ T³
None of these
✅ The correct answer is option B.
1505. All analogy equations connecting friction factor and heat transfer co-efficient apply only to
Wall or skin friction
Form friction
Both A and B
Turbulent flow
✅ The correct answer is option A.
1506. Which one gives the monochromatic emissive power for black body radiation?
Planck’s law
Kirchhoffs law
Wien’s law
Stefan-Boltzman law
✅ The correct answer is option A.
1507. A long iron rod initially at a temperature of 20°C has one end dipped in boiling water (100°C) at time, t = 0. The curved surface of the rod is insulated so that heat conduction is one dimensional in the axial direction. The temperature at a distance 100 mm from the dipped end becomes 40°C at time, t = 200 s. The same temperature is achieved at a distance of 200 mm from the dipped end at time
t = 283 s
t = 356 s
t = 400 s
t = 800 s
✅ The correct answer is option D.
1508. Evaporator tubes are generally
Horizontal
Vertical
Inclined
Random
✅ The correct answer is option B.
1509. jH factor for heat transfer depends upon the __________ number.
Biot
Nusselt
Reynolds
Prandtl
✅ The correct answer is option C.
1510. The absorptivity of a grey body at a given temperature __________ with increasing wavelength of radiation.
Increases
Decreases
Remains constant
May increase or decrease ; depends on the material
✅ The correct answer is option D.