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Heat Transfer Multiple Choice Questions | MCQs | Quiz

Heat Transfer Interview Questions and Answers
Practice Heat Transfer questions and answers for interviews, campus placements, online tests, aptitude tests, quizzes and competitive exams.

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•   Heat Transfer Modes
•   Steady & Unsteady Heat
•   Fourier Equation
•   Thermal Conductivity
•   Heat Conduction Equation
•   Different Materials
•   Plane Wall Conduction
•   Composite Wall Conduction
•   Cylindrical Wall Conduction
•   Sphere Conduction
•   Shape Factor
•   Variable Conductivity
•   Insulation Thickness
•   Plane Wall Heat Generation
•   Dielectric Heating
•   Cylinder Heat Generation
•   Sphere Heat Generation
•   Fins Basics
•   Heat Steady Flow
•   Heat Dissipation
•   Fin Heat Dissipation
•   Fin Performance
•   Fins Designs
•   Triangular & Parabolic Fins
•   Thermometric Well
•   Time Constant
•   Thermocouple Response
•   Infinite Transient Heat
•   Finite Transient Heat
•   Biot Number
•   Lump System Analysis
•   Transient Heat Conduction
•   Periodic Variation
•   Transmissivity
•   Reflectivity
•   Absorptivity
•   Black Body
•   Spectral & Spatial Energy
•   Planck's Law
•   Stefan Boltzman Law
•   Wein's Displacement Law
•   Kirchoff's Law
•   Emitters Selection
•   Radiations Intensity
•   Solar Radiations
•   Solar Absorptivity
•   Heat Exchanger
•   Shape Factor
•   Non Black Bodies
•   Network Approach
•   Radiations Shields
•   Reradiating Surfaces
•   Gaseous Radiations
•   Fouling Factor
•   Geomertical Properties
•   Flow Types
•   Reynolds Number
•   Convection Types
•   Nusselt Number
•   Newton Rikhman Law
•   Dimensions System
•   Dimensional Homogeneity
•   Rayleigh's Method
•   Buckingham's Pi Method
•   Model Studies & Similitude
•   Dimensional Analysis Pros
•   Dimensionless Groups
•   Forced Convection
•   Laminar Flow
•   Turbulent Flow
•   Boiling Introduction
•   Bubble Growth
•   Nucleate Boiling
•   Free Convection Boiling
•   Condensation
•   Laminar Film Condensation
•   Turbulent Condensation
•   Thermal Boundary Layer
•   Pohlhausen Equation
•   Reynolds Analogy
•   Hydrodynamic Layer
•   Von Karmal Equation
•   Heat Classification
•   Capacity Ratio Mean Value
•   Mean Temperature
•   Specific Heat
•   Heat Transfer Coefficient
•   Cylindrical Heat Flux
•   Heat Effectiveness
•   Transfer Units

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Heat Transfer Questions and Answers – Conduction Through a Sphere

Posted on June 16, 2017 by Manish

This set of Heat Transfer Multiple Choice Questions & Answers (MCQs) focuses on “Conduction Through A Sphere”.

1. The temperature distribution associated with radial conduction through a sphere is represented by
a) Parabola
b) Hyperbola
c) Linear
d) Ellipse
View Answer

Answer: b
Explanation: As conduction is radial i.e. in outward direction, so it follows the hyperbola equation..
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2. The thermal resistance for heat conduction through a spherical wall is
a) (r2-r1)/2πkr1r2
b) (r2-r1)/3πkr1r2
c) (r2-r1)/πkr1r2
d) (r2-r1)/4πkr1r2
View Answer

Answer: d
Explanation: We get this on integrating the equation Q = -k A d t/ d r from limits r1 to r2 and T1 to T2.

3. The rate of conduction heat flow in case of a composite sphere is given by
a) Q = t1 – t2/ (r2 – r1)/4πk1r1r2 + (r3 – r2 )/4πk2r2r3
b) Q = t1 – t2/ (r2 – r1)/4πk1r1r2 + (r3 – r2 )/4πk2r2r3
c) Q = t1 – t2/ (r2 – r1)/4πk1r1r2 + (r3 – r2 )/4πk2r2r3
d) Q = t1 – t2/ (r2 – r1)/4πk1r1r2 + (r3 – r2 )/4πk2r2r3
View Answer

Answer: c
Explanation: Here, convective film coefficient at the inner and outer surfaces are also considered.

4. The thermal resistance for heat conduction through a hollow sphere of inner radius r1 and outer radius r2 is
a) r 2 – r 1/4πk r 1r 2
b) r 2 /4πk r 1r 2
c) r 1/4πk r 1r 2
d) 4πk r 1r 2
View Answer

Answer: a
Explanation: As Q = d t/ R T. Here R T is thermal resistance.

5. A spherical vessel of 0.5 m outside diameter is insulated with 0.2 m thickness of insulation of thermal conductivity 0.04 W/m degree. The surface temperature of the vessel is – 195 degree Celsius and outside air is at 10 degree Celsius. Determine heat flow per m2 based on inside area
a) – 63.79 W/m2
b) – 73.79 W/m2
c) – 83.79 W/m2
d) – 93.79 W/m2
View Answer

Answer: b
Explanation: Heat flow based on inside area = Q/4 π r 2 = – 73.79 W/m2.
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6. The quantity d t/Q for conduction of heat through a body i.e. spherical in shape is
a) ln (r2/r1)/2πLk
b) ln (r2/r1)/πLk
c) ln (r2/r1)/2Lk
d) ln (r2/r1)/2πk
View Answer

Answer: a
Explanation: We get this on integrating the equation Q = -k A d t/ d r from limits r1 to r2 and T1 to T2.

7. A spherical vessel of 0.5 m outside diameter is insulated with 0.2 m thickness of insulation of thermal conductivity 0.04 W/m degree. The surface temperature of the vessel is – 195 degree Celsius and outside air is at 10 degree Celsius. Determine heat flow
a) – 47.93 W
b) – 57.93 W
c) – 67.93 W
d) – 77.93 W
View Answer

Answer: b
Explanation: Q = 4 π k r 1 r 2 (t 1 – t 2)/r 2 – r 1 = -57.93 W.

8. If we increase the thickness of insulation of a circular rod, heat loss to surrounding due to
a) Convection and conduction increases
b) Convection and conduction decreases
c) Convection decreases while that due to conduction increases
d) Convection increases while that due to conduction decreases
View Answer

Answer: d
Explanation: In convection energy is transferred between solid and fluid but in conduction from T 1 to T 2.

9. The following data pertains to a hollow cylinder and a hollow sphere made of same material and having the same temperature drop over the wall thickness
Inside radius = 0.1 m and outside surface area = 1 square meter
If the outside radius for both the geometrics is same, calculate the ratio of heat flow in the cylinder to that of sphere?
a) 0.056
b) 2.345
c) 1.756
d) 3.543
View Answer

Answer: c
Explanation: For sphere r 2 = (1/4 π) 1/2 = 0.282 m, for cylinder, l = A 2/2 r 2 π = 0.565 m.

10. The oven of an electric store, of total outside surface area 2.9 m2 dissipates electric energy at the rate of 600 W. The surrounding room air is at 20 degree Celsius and the surface coefficient of heat transfer between the room air and the surface of the oven is estimated to be 11.35 W/m 2 degree. Determine the average steady state temperature of the outside surface of the store
heat-transfer-questions-answers-conduction-sphere-q10
a) 38.22 degree Celsius
b) 48.22 degree Celsius
c) 58.22 degree Celsius
d) 68.22 degree Celsius
View Answer

Answer: a
Explanation: Q = h A (t 0 – t a).
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Sanfoundry Global Education & Learning Series – Heat Transfer.

To practice all areas of Heat Transfer, here is complete set of 1000+ Multiple Choice Questions and Answers.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer and SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage & Cluster Administration, Advanced C Programming, SAN Storage Technologies, SCSI Internals and Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him below:
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