MCQs
Total Questions : 30
| Page 3 of 3 pages
Answer: Option A. -> Parabolic
Answer: (a).Parabolic
Answer: (a).Parabolic
Answer: Option A. -> 30000 W/m²
Answer: (a).30000 W/m²
Answer: (a).30000 W/m²
Answer: Option D. -> One half
Answer: (d).One half
Answer: (d).One half
Answer: Option B. -> ii and iii
Answer: (b).ii and iii
Answer: (b).ii and iii
Answer: Option B. -> 700 degree Celsius
Answer: (b).700 degree Celsius
Answer: (b).700 degree Celsius
Question 26. 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
Answer: Option B. -> 12.5 degree Celsius
Answer: (b).12.5 degree Celsius
Answer: (b).12.5 degree Celsius
Question 27. A composite slab consists of 5 cm thick layer of steel (k = 146 kJ/m hr degree) on the left side and a 6 cm thick layer of brass (k = 276 kJ/m hr degree) on the right hand side. The outer surfaces of the steel and brass are maintained at 100 degree Celsius and 50 degree Celsius. The contact between the two slabs is perfect and heat is generated at the rate of 4.2 * 10⁵ k J/m² hr at the plane of contact. The heat thus generated is dissipated from both sides of composite slab for steady state conditions. Calculate the temperature at the interface
Answer: Option B. -> 125.26 degree celsius
Answer: (b).125.26 degree celsius
Answer: (b).125.26 degree celsius
Answer: Option A. -> At r = r 1, the conduction region is perfectly insulated
Answer: (a).At r = r 1, the conduction region is perfectly insulated
Answer: (a).At r = r 1, the conduction region is perfectly insulated
Answer: Option B. -> 434.45 degree Celsius
Answer: (b).434.45 degree Celsius
Answer: (b).434.45 degree Celsius
Question 30. 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
Answer: Option C. -> 305.6 degree Celsius
Answer: (c).305.6 degree Celsius
Answer: (c).305.6 degree Celsius