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Automatic Control Systems - Engineering

Q1:

Examine the following statements
  1. Air and gases are compressible.
  2. Air, gases and some liquids are compressible.
  3. Oil can function as hydraulic fluid as well as lubricator.
Which of the above statements are correct?

A 3 only

B 2 and 3 only

C 1 and 3 only

D 2 only

ANS:C - 1 and 3 only

Liquids are also compressible especially non Newtonian liquids/fluids.