Correct option is D
When a centrifugal pump is compared with a reciprocating pump:
The torque is not uniform
This is true for reciprocating pumps, not centrifugal pumps. Centrifugal pumps have relatively uniform torque.
Complicated construction
Reciprocating pumps have more complicated construction due to pistons, valves, etc. Centrifugal pumps are simpler.
Maintenance charges are high
Maintenance is generally lower for centrifugal pumps because of fewer moving parts.
Installation is easy
Centrifugal pumps are easy to install, require less foundation work, and occupy less space.
