Conduction
Natural convection
Forced convection
Radiation
✅ The correct answer is option D.
Engineering
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1472. Conductance is given by(where, x = thickness, A = heat flow area, K = thermal conductivity.)
X/KA
KA/x
K/Ax
A/Kx
✅ The correct answer is option B.
1473. If air (a non-condensing gas) is present in a condensing vapor stream, it will __________ the condensation rate of vapor.
Increase
Decrease
Not affect
Increase the condensing film co-efficient as well as
✅ The correct answer is option B.
1474. LMTD for counterflow and prallel flow heat exchanger will be the same, when the
Cold fluid is heated to a certain temperature by condensing steam (isothermal fluid)
Outlent temperature of both the hot and cold fluid are same
Outlet temperature of hot fluid is less than the outlet temperature of the cold fluid
None of these
✅ The correct answer is option A.
1475. Extremely large or small volumes of fluids are generally best routed through the shell side of a shell and tube heat exchanger, because of the
Less corrosion problems
Flexibility possible in the baffle arrangement
Low pressure drop
High heat transfer co-efficient
✅ The correct answer is option B.
1476. The radiation heat flux from a heating element at a temperature of 800°C, in a furnace maintained at 300°C is 8 kW/m². The flux, when the element temperature is increased to 1000°C for the same furnace temperature is
11.2 kW/m²
12.0 kW/m²
14.6 kW/m²
16.5 kW/m²
✅ The correct answer is option D.
1477. In case of __________ boiling, the bubbles formed on a submerged hot surface get absorbed in the mass of the liquid.
Nucleate
Pool
Low pressure
None of these
✅ The correct answer is option B.
1478. A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the __________ number.
Condensation
Grashoff
Stantan
Brinkman
✅ The correct answer is option D.
1479. (NRe.NPr)(D/L) is called the __________ number
Peclet
Stanton
Graetz
None of these
✅ The correct answer is option C.
1480. In Fourier’s law, the proportionality constant is called the
Heat transfer co-efficient
Thermal diffusivity
Thermal conductivity
Stefan-Boltzman constant
✅ The correct answer is option C.