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Steel Authority Of India Limited

Management Trainee

SAIL Chemical Engineering Papers

Q.1.Loss of heat from unlagged steam pipe to the ambient air is by

• conduction
• convection
• radiation
• all the above

Q.2.Fourier's law applies to the heat transfer by

• convection
• radiation
• conduction
• all the above

Q.3.Fourier's law of heat conduction applies to .......... surfaces.

• isothermal
• non-isothermal
• both the above
• none of the above

Q.4.Unsteady state heat conduction occurs, when

• temperature distribution is independent of time
• temperature distribution is dependent on time
• heat flows in one direction only
• three dimensional heat flow is concerned

Q.5.What is the unit of thermal conductivity ?

• Kcal/hr.m2 0C
• Kcal/hr.m. 0C
• Kcal/hr.m
• Kcal/hr.0C

Q.6.The unit of heat transfer co-efficient is

• BTU/hr.ft2 0F
• BTU/hr.0F.ft.
• BTU/hr.0F
• BTU/hr.ft

Q.7.Which of the following is correct ?

• Rate = Driving force * Resistance
• Driving force = Rate * Resistance
• Resistance = Driving force * Rate
• Rate = Resistance/Driving force

 Q.8.An insulator should have

• low thermal conductivity
• high thermal conductivity
• less resistance to heat flow
• a porous structure

Q.9.Heat flux through several resistance in series in analogous to the current flowing through several

• resistances in parallel
• capacitors in series
• resistances in series
• none of these

Q.10.The overall resistance for heat transfer through a series of flat resistance, is the ..... of the resistances.

• average
• geometric mean
• product
• sum

Q.11.Which of the following has the highest thermal conductivity ?

• Brick
• Air
• Water
• Silver

Q.12.Which area is used in case of heat flow by conduction through a cylinder ?

• Logarithmic mean area
• Arithmetic mean area
• Geometric mean area
• None of these

Q.13.For heat flow through very thick walled cylinder, use ............ mean radius.

• arithmetic
• logarithmic
• geometric
• none of these

Q.14.What is the logarithmic mean of r1 and r2 ?

• r1 - r2/ln r1/r2
• r1 - r2/ln r2/r1
• r2 - r1/ln r1/r2
• r1 - r2/ - ln r1/r2

Q.15.What is Nusselt number ?

• Cp.μ/k
• hD/k   
• h.Cp/μ
• Cp.μ/h

Q.16.Prandtl number is given by

• Cp.μ/a
• hD/k
• Cp.μ/k
• μ/h.Cp

Q.17.Thermal diffusivity is given by

• k/r.Cp
• r.Cp/k
• Cp.μ/a
• μ/hCp

Q.18.Grashhoff number is given by

• g D3. β .∆ tr2/μ2 
• g D2β∆tr/μ2
• g D2β∆tr2μ
• g D3β∆tr2/μ

Q.19.If h1 = inner film co-efficient and h2 = outer film co-efficient, then the overall heat transfer co-efficient is

• always less than h1
• always between h1 and h2
• always higher than h2
• dependent on metal resistance

Q.20.Gratez number is give by

• mCp/kL
• kL/mCp
• mCp/kμ
• kL/mCp

Q.21.In the equation Q= UA ∆t ; ∆t is

• geometric mean temperature difference.
• arithmetic mean temperature difference.
• logarithmic mean temperature difference.
• the difference of average bulk temperatures of hot and cold fluids.

Q.22.Peclet number (Pe) is given by

• Pe = Re.Pr
• Pe = Re/Pr
• Pe = Pr/Re
• Pe = Nu.Re

Q.23.Prandtl number is the reciprocal of

• Thermal diffusivity/ Momentum diffusivity
• thermal diffusivity x Momentum
• Thermal diffusivity x Mass diffusivity
• Mass diffusivity x Momentum diffusivity

Q.24.Maximum heat transfer rate is obtained in .......... flow.

• laminar
• turbulent
• creeping
• transition region

Q.25.Heat flux is the time rate of heat transfer per unit

• length
• area
• volume
• none of these

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