Answers (3)

kaif 01-09-2012
kaif - Chhattisgarh Swami Vivekanand Technical University
They does not provide lubrication and they are subjected to contimination through tramp oil, molds, fungi and bectaria.
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shreya 01-09-2012
shreya - Acharya Nagarjuna University
1) Contamination over time 2) Health hazardous 3) Unable to perform lubrication.
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