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1. Consider system A at uniform temperature t and system B at another uniform temperature T (t > T). Let the two systems be brought into contact and be thermally insulated from their surroundings but not from each other. Energy will flow from system A to system B because of
a. Temperature difference
b. Energy difference
c. Mass difference
d. Volumetric difference
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Answer: (a).Temperature difference

2. The literature of heat transfer generally recognizes distinct modes of heat transfer. How many modes are there?
a. One
b. Two
c. Three
d. Four
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Answer: (c).Three

3. An oil cooler in a high performance engine has an outside surface area 0.12 m² and a surface temperature of 65 degree Celsius. At any intermediate time air moves over the surface of the cooler at a temperature of 30 degree Celsius and gives rise to a surface coefficient equal to 45.4 W/ m² K. Find out the heat transfer rate?
a. 238.43 W
b. 190.68 W
c. 543.67 W
d. 675.98 W
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Answer: (b).190.68 W

4. Unit of rate of heat transfer is
a. Joule
b. Newton
c. Pascal
d. Watt
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Answer: (d).Watt

5. Convective heat transfer coefficient doesn’t depend on
a. Surface area
b. Space
c. Time
d. Orientation of solid surface
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Answer: (a).Surface area

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