Answer / gajanan kuhite

The drum level varies due to cause of change in drum
pressure & drum level will be compensate by the 3 element
control system,so the drum level which is rise or fall
before acting 3 element control system is generally called
actual drum level. & when it is compensate after the action
of 3 element control system is called compensated drum level

Answer / lalit shukla

drum level not compensated by 3 element , 3 element control
the drum level.
drum level compensated by drum pressure & temp.

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