Step 1: Understanding the Concept:
Homogenizers require high pressure for operation.
The type of pump used must generate this pressure.
Step 2: Key Formula or Approach:
No specific formula.
Need to know the pump used in homogenizers.
Step 3: Detailed Explanation:
A triplex reciprocating pump is used in milk homogenizers.
It can generate the high pressures required (up to 3000 psi).
Centrifugal pumps cannot generate such high pressures.
Gear pumps are used for low-pressure applications.
Thus, the correct pump is the triplex reciprocating pump.
Step 4: Final Answer:
The pump used in milk homogenizer is a triplex reciprocating pump.
Hence, the correct option is (C).