Explore topic-wise MCQs in Heat Transfer Questions and Answers.

This section includes 3 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.

1.

A hollow sphere (k = 30 W/m K) of inner radius 6 cm and outside radius 8 cm has a heat generation rate of 4000000 W/m3. The inside surface is insulated and heat is removed by convection over the outside surface by a fluid at 100 degree Celsius with surface conductance 300 W/m2 K. Make calculations for the temperature at the outside surfaces of the sphere

A. 105.6 degree Celsius
B. 205.6 degree Celsius
C. 305.6 degree Celsius
D. 405.6 degree Celsius
Answer» D. 405.6 degree Celsius
Discussion
2.

A solid sphere of 8 cm radius has a uniform heat generation 0f 4000000 W/m3. The outside surface is exposed to a fluid at 150 degree Celsius with convective heat transfer coefficient of 750 W/m2 K. If thermal conductivity of the solid material is 30 W/m K, determine maximum temperature

A. 444.45 degree Celsius
B. 434.45 degree Celsius
C. 424.45 degree Celsius
D. 414.45 degree Celsius
Answer» C. 424.45 degree Celsius
Discussion
3.

An 8 cm diameter orange, approximately spherical in shape, undergoes ripening process and generates 18000 k J/m3 hr of energy. If external surface of the orange is at 6.5 degree Celsius, find out the temperature at the center of the orange. Take thermal conductivity = 0.8 k J/ m hr degree for the orange material

A. 13.5 degree Celsius
B. 12.5 degree Celsius
C. 11.5 degree Celsius
D. 10.5 degree Celsius
Answer» C. 11.5 degree Celsius
Discussion