Chemical Engineering Basics
Frost formation on the evaporator tubes in the domestic refrigerators

Is immaterial
Causes heat loss due to poor heat transfer
Can be prevented by proper design
Decreased compressor power

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Chemical Engineering Basics
Which of the following are made out of the carbon steel having carbon content of 0.9 to 1% ?

Small punches, broaches reamers and springs
Cutlery, screws, rivets and files
Mandrels, twist drills, small lathe tools and razors
Forgings like can shaft, structural steel plate, threading dies and drawing dies

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