Which type of lubricant are calcium and sodium?

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ALP CBT 2 Fitter Previous Paper: Held on 21 Jan 2019 Shift 3
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  1. Permanent
  2. Liquid
  3. Solid
  4. Semi-solid

Answer (Detailed Solution Below)

Option 4 : Semi-solid
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Detailed Solution

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Explanation:

  • A lubricant is a substance used to reduce friction between surfaces in mutual contact
  • It will reduce the interlocking of the irregularities (Friction) of the surfaces
  • The property of reducing friction is known as lubricity (slipperiness)
  • They can be grouped as:
    • Liquid Lubricants: Mineral Oil (paraffin, naphthalene, and aromatics), Fatty and vegetable oils (Animal oils, tallow, lard, castor oil, olive oil, rosin oils, etc), Synthetic oils
    • Semi-Liquid Lubricants: Greases, calcium, sodium, etc
    • Solid Lubricants: Graphite, soap-stone, talc, French chalk, etc.
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