1 to 100
0.5 to 50
10 to 100
100 to 1000
✅ The correct answer is option B.
Heat Transfer MCQs
Evaporation by thermocompression results in the
Saving of steam
Realisation of multiple effect economy in a single effect
Both A and B
None of these
✅ The correct answer is option C.
The steam ejector is used to
Remove condensate from the steam pipelines
Create vacuum
Superheat the steam
None of these
✅ The correct answer is option B.
The left face of a one dimensional slab of thickness 0.2 m is maintained at 80°C and the right face is exposed to air at 30°C. The thermal conductivity of the slab is 1.2 W/m.K and the heat transfer co-efficient from the right face is 10 W/m².K. At steady state, the temperature of the right face in °C is
77.2
71.2
63.8
48.7
✅ The correct answer is option D.
In the free convection regime of pool boiling, the heat flux is proportional to
Δt1/2
Δt2
Δt5/4
Δt
✅ The correct answer is option C.
The Sieder-Tate correlation for heat transfer in turbulent flow in pipe gives Nu α Re0.8, where, Nu is the Nusselt number and Re is the Reynolds number for the flow. Assuming that this relation is valid, the heat transfer co-efficient varies with the pipe diameter (D) as
(D)-1.8
(D)-0.2
(D)0.2
(D)1.8
✅ The correct answer is option B.
Shell side pressure drop in a shell and tube heat exchanger does not depend upon the
Baffle spacing & shell diameter
Tube diameter & pitch
Viscosity, density & mass velocity of shell side fluid
None of these
✅ The correct answer is option D.
If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface tempeature follows __________ law.
Parabolic
Hyperbolic
Linear
Logarithmic
✅ The correct answer is option A.
For specified tube outside diameter, higher BWG means higher
Tube thickness
Cross-sectional area
Weight per unit length
None of these
✅ The correct answer is option B.
In an interphase heat transfer process, the equilibrium state corresponds to equality of temperature in the two phases, while the condition for equilibrium in an interphase mass transfer process is equality of
Concentrations
Chemical potentials
Activity co-efficients
Mass transfer co-efficients
✅ The correct answer is option A.