Heat Transfer Quiz-1
Heat Transfer Mastery Quiz
Test your knowledge of heat transfer concepts in this engaging quiz designed for students and professionals alike! Dive into problems focused on thermal conductivity, heat exchangers, and insulation materials.
Participants will explore real-world scenarios, including:
- Temperature distributions in materials
- Insulation thickness calculations
- Heat exchanger effectiveness
For a cylinder of radius 10 mm the temperature distribution in radial direction is given by T = 2r 2 – 4r + 5 where r (in m) is measured from centre. The cylinder is placed in ambient at 20°C and heat transfer coefficient of 8.49 W/m2K. If the thermal conductivity of cylinder is 30 W/mK. The wall temperature of cylinder is
30°C
18°C
34°C
29°C
A wall of 0.5 m thickness is to be constructed from a material which has an average thermal conductivity of 1.4 W/mK. The wall is to be insulated with a material having an average thermal conductivity of 0.35 W/mK so that the heat loss per square metre will not exceed 1450 W. Assuming that the inner and outer surface temperature are 1200°C and 15°C respectively. The thickness of insulation required is _____metre.
0.16
0.20
0.24
0.28
One end of a thermally black metallic rod of length 10 cm is inserted in a furnace whose temperature is 827°C. The curved surface of the rod is insulated. The room temperature is 27°C. When the steady state is attained the temperature of the other end of rod is 702°C. The thermal conductivity of the rod is ______ W/mK.
44.32
40.62
54.28
56.27
A counter flow heat exchanger is employed to cool 0.55 kg/s (cp = 2.45 kJ/kg-K) of oil from 115°C to 40°C by the use of water. The inlet and outlet temperature of cooling water (cp = 4.18 kJ/kg-K) are 15°C and 75°C, respectively. The effectiveness of the heat exchanger is
0.80
0.25
0.52
0.75
An enclosure 1 × 2 × 4 consists of three surfaces. Flat surface at the bottom 1 × 2, A1 = 2 m2, flat surface at the top 1 × 2 m, A2 = 2 m2 and all vertical surfaces taken together A3 = 24 m2. All the surfaces are flat and A1 is parallel to A2. Shape factor F1–2 = 0.035. The ratio of F13 and F3–2 will be
1.89
1.05
1.19
0.89
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