35.5
43.75
81.25
48.25
✅ The correct answer is option C.
Engineering
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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.
1573. The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is
More
Less
Some
Either more or less ; depends on the nature of vapor
✅ The correct answer is option C.
1574. The variation of thermal conductivity of a metal with temperature is often correlated using an expression of the form K = Kâ‚€ + at. where, K is the thermal conductivity and T is the temperature (in °K). The units of ‘a’ in SI system will be
W/m.k
W/m
W/m.k²
None, A is just a number
✅ The correct answer is option C.
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.
1576. Which of the following is directly concerned with the heat transfer?
Strouhal number
Sherwood number
Euler number
Grashoff number
✅ The correct answer is option D.
1577. Intermittant tube cleaning is possible to be done in case of a __________ evaporator.
Basket type
Horizontal tube
Calendria
None of these
✅ The correct answer is option A.
1578. Heat transfer occurs by natural convection because change in temperature causes difference in
Viscosity
Density
Thermal conductivity
Heat capacity
✅ The correct answer is option B.
1579. Water is normally used as a coolant in the heat exchange equipments mainly because ofits
Abundance & high heat capacity
Low density
Low viscosity
High fluidity
✅ The correct answer is option A.
1580. According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor)
2f
f
f/2
f/4
✅ The correct answer is option C.