Device '27' shown in the illustration is used to __________. Illustration MO-0111

Correct Answer: Option C — regulate maximum vacuum during normal operation

The device labeled '27' functions as a vacuum regulator or breaker. By controlling the amount of air or vapor in the system, it maintains the vacuum within the design parameters required for efficient evaporation. Proper regulation prevents the vacuum from becoming too high, which could cause instability in the evaporator.