My Report

Heat Transfer Practice Test 4


Correct Answer: 2 points | Wrong: -1 point
Grades: A* (100% score) | A (80%-99%) | B (60%-80%) | C (40%-60%) | D (0%-40%)
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1. In the non-dimensional Biot number, the characteristics length is the ratio of

2. The curve for unsteady state cooling or heating of bodies is

3. What is the value of characteristics length for sphere?

4. What is the absorptivity of the gray body?

5. The boundary conditions in case of transient heat conduction in infinite thick solids are
(i) t (x = 0) = t i
(ii) t (0, T) = t a for T greater than zero
(iii) t (infinity, T) = t i for T greater than zero
Identify the correct statements

6. The value of transmissivity may vary from

7. Radiant energy with an intensity of 800 W/m2 strikes a flat plate normally. The absorptivity is thrice the reflectivity and twice the transmissivity. Determine the rate of reflection

8. Let 220 W/m2 of radiant energy is absorbed by a convex surface, 90 W/m2 is reflected and 40 W/m2 is transmitted through it. What is the value of absorptivity?

9. When a surface absorbs a certain fixed percentage of striking radiation the surface is called

10. What is the wavelength band for TV rays?


 

Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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