RMO Real Engineer Practice Exam - Prep, Practice Test & Study Guide

When insulation is removed from the suction line while the engine temperature is at 85 degrees Fahrenheit, excessive superheat can occur. This happens because the suction line carries refrigerant back to the compressor after it has absorbed heat from the evaporator. The insulation helps maintain the temperature of the refrigerant in the line and prevents heat from being absorbed from the surrounding environment.

Without the insulation, heat can enter the suction line, raising the temperature of the refrigerant before it reaches the compressor. If the refrigerant's temperature increases significantly, it can lead to excessive superheat, which means the refrigerant is in a gaseous state when it reaches the compressor, at a temperature higher than its saturation point. This condition can put a strain on the compressor and reduce the overall efficiency of the cooling system, as the compressor may struggle to operate optimally under these conditions.

In a properly insulated system, the refrigerant should arrive at the compressor with a minimal temperature increase, ensuring efficient performance. However, removing the insulation allows ambient heat to be absorbed, leading to this excessive rise in temperature, hence the correct answer is that excessive superheat occurs.